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US20030064366A1 - Real-time sequence determination - Google Patents

Real-time sequence determination Download PDF

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Publication number
US20030064366A1
US20030064366A1 US09/901,782 US90178201A US2003064366A1 US 20030064366 A1 US20030064366 A1 US 20030064366A1 US 90178201 A US90178201 A US 90178201A US 2003064366 A1 US2003064366 A1 US 2003064366A1
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US
United States
Prior art keywords
polymerase
tag
dna
monomer
tagged
Prior art date
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Abandoned
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US09/901,782
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English (en)
Inventor
Susan Hardin
Xiaolian Gao
James Briggs
Richard Willson
Shiao-Chun Tu
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Life Technologies Corp
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Individual
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22807697&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20030064366(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to US09/901,782 priority Critical patent/US20030064366A1/en
Publication of US20030064366A1 publication Critical patent/US20030064366A1/en
Assigned to VISIGEN, INC. reassignment VISIGEN, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GAO, XIAOLIAN, BRIGGS, JAMES M., HARDIN, SUSAN H., TU, SHIAO-CHUN, WILLSON, RICHARD C.
Priority to US11/007,642 priority patent/US20050266424A1/en
Priority to US11/007,797 priority patent/US7329492B2/en
Priority to US11/648,184 priority patent/US20100255463A1/en
Priority to US11/648,722 priority patent/US20070172868A1/en
Priority to US11/648,137 priority patent/US20070292867A1/en
Priority to US11/648,106 priority patent/US20070172858A1/en
Priority to US11/648,856 priority patent/US20070275395A1/en
Priority to US11/648,191 priority patent/US20070172867A1/en
Priority to US11/648,138 priority patent/US20070172863A1/en
Priority to US11/648,182 priority patent/US20070172866A1/en
Priority to US11/648,115 priority patent/US20070172861A1/en
Priority to US11/648,136 priority patent/US20070172862A1/en
Priority to US11/648,174 priority patent/US20070172865A1/en
Priority to US11/648,713 priority patent/US20070184475A1/en
Priority to US11/648,164 priority patent/US20070172864A1/en
Assigned to Life Technologies Corporation reassignment Life Technologies Corporation ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VISIGEN BIOTECHNOLOGIES, INC
Priority to US12/410,370 priority patent/US20110014604A1/en
Priority to US12/412,208 priority patent/US20100304367A1/en
Priority to US12/411,997 priority patent/US20110021383A1/en
Priority to US12/414,417 priority patent/US20090275036A1/en
Priority to US12/419,214 priority patent/US20090305278A1/en
Priority to US12/419,660 priority patent/US20110059436A1/en
Priority to US12/724,392 priority patent/US20100317005A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6869—Methods for sequencing

Definitions

  • the present invention relates to a single-molecule sequencing apparatus and methods.
  • the present invention relates to a single-molecule sequencing apparatus and methods using tagged polymerizing agents and/or tagged monomers where the tagged polymerizing agent and/or the tagged monomers undergo a change in a detectable property before, during and/or after monomer insertion into a growing polymer chain.
  • the apparatus and methods are ideally-suited for sequencing DNA, RNA, polypeptide, carbohydrate or similar bio-molecular sequences under near real-time or real-time conditions.
  • the present invention also relates to a single-molecule sequencing apparatus and methods using tagged depolymerizing agents and/or tagged depolymerizable polymer where the tagged depolymerizing agent and/or the tagged depolymerizable polymer undergo a change in a detectable property before, during and/or after monomer removal from the depolymerizable polymer chain.
  • the apparatus and methods are ideally-suited for sequencing DNA, RNA, polypeptide, carbohydrate or similar bio-molecular sequences.
  • the present invention also relates to detecting a signal evidencing interactions between the tagged polymerizing agent or depolymerizing agent and a tagged or untagged polymer subunit such as a monomer or collection of monomers, where the detected signal provides information about monomer order.
  • the methods are carried out in real-time or near real-time.
  • DNA sequence information provides scientists with information critical to a wide range of biological processes.
  • the order of bases in DNA specifies the order of bases in RNA, the molecule within the cell that directly encodes the informational content of proteins.
  • DNA sequence information is routinely used to deduce protein sequence information. Base order dictates DNA structure and its function, and provides a molecular program that can specify normal development, manifestation of a genetic disease, or cancer.
  • DNA sequence information may provide a way to uniquely identify individuals.
  • a DNA molecule is comprised of four bases, adenine (A), guanine (G), cytosine (C), and thymine (T). These bases interact with each other in very specific ways through hydrogen bonds, such that A interacts with T, and G interacts with C. These specific interactions between the bases are referred to as base-pairings. In fact, it is these base-pairings (and base stacking interactions) that stabilize double-stranded DNA.
  • the two strands of a DNA molecule occur in an antiparallel orientation, where one strand is positioned in the 5′ to 3′ direction, and the other strand is positioned in the 3′ to 5′ direction.
  • 5′ and 3′ refer to the directionality of the DNA backbone, and are critical to describing the order of the bases.
  • the convention for describing base order in a DNA sequence uses the 5′ to 3′ direction, and is written from left to right. Thus, if one knows the sequence of one DNA strand, the complementary sequence can be deduced.
  • Sanger sequencing is currently the most commonly used method to sequence DNA (Sanger et al., 1977). This method exploits several features of a DNA polymerase: its ability to make an exact copy of a DNA molecule, its directionality of synthesis (5′ to 3′), its requirement of a DNA strand (a ‘primer’) from which to begin synthesis, and its requirement for a 3′ OH at the end of the primer. If a 3′ OH is not available, then the DNA strand cannot be extended by the polymerase.
  • ddNTP dideoxynucleotide
  • ddNTP dideoxynucleotide
  • ddATP dideoxynucleotide
  • ddTTP dideoxynucleotide
  • ddGTP dideoxynucleotide
  • ddCTP a base analogue lacking a 3′ OH
  • the polymerase is unable to add any additional bases to the end of the strand.
  • ddNTPs are incorporated by the polymerase into the DNA strand using the same base incorporation rules that dictate incorporation of natural nucleotides, where A specifies incorporation of T, and G specifies incorporation of C (and vice versa).
  • the automated sequencer is used to separate sequencing reaction products, detect and collect (via computer) the data from the reactions, and analyze the order of the bases to automatically deduce the base sequence of a DNA fragment.
  • Automated sequencers detect extension products containing a fluorescent tag. Sequence read lengths obtained using an automated sequencer are dependent upon a variety of parameters, but typically range between 500 to 1,000 bases (3-18 hours of data collection). At maximum capacity an automated sequencer can collect data from 96 samples in parallel.
  • dye-labeled terminator chemistry When dye-labeled terminator chemistry is used to detect the sequencing products, base identity is determined by the color of the fluorescent tag attached to the ddNTP. After the reaction is assembled and processed through the appropriate number of cycles (3-12 hours), the extension products are prepared for loading into a single lane on an automated sequencer (unincorporated, dye-labeled ddNTPs are removed and the reaction is concentrated; 1-2 hours).
  • An advantage of dye-terminator chemistry is that extension products are visualized only if they terminate with a dye-labeled dNTP; prematurely terminated products are not detected. Thus, reduced background noise typically results with this chemistry.
  • dRhodamine dichlororhodamine
  • the d-Rhodamine acceptor dyes associated with the terminators are dichloro[R110], dichloro[R6G], dichloro[TAMRA] or dichloro[ROX], for the G-, A-, T- or C-terminators, respectively.
  • the donor dye (6-FAM) efficiently absorbs energy from the argon ion laser in the automated sequencing machine and transfers that energy to the linked acceptor dye.
  • the linker connecting the donor and acceptor portions of the terminator is optimally spaced to achieve essentially 100% efficient energy transfer.
  • the fluorescence signals emitted from these acceptor dyes exhibit minimal spectral overlap and are collected by an ABI PRISM 377 DNA sequencer using 10 nm virtual filters centered at 540, 570, 595 and 625 nm, for G-, A-, T- or C-terminators, respectively.
  • energy transfer dye-labeled terminators produce brighter signals and improve spectral resolution.
  • the predominant enzyme used in automated DNA sequencing reactions is a genetically engineered form of DNA polymerase I from Thermus aquaticus .
  • This enzyme, AmpliTaq DNA Polymerase, FS was optimized to more efficiently incorporate ddNTPs and to eliminate the 3′ to 5′ and 5′ to 3′ exonuclease activities.
  • Replacing a naturally occurring phenylalanine at position 667 in T. aquaticus DNA polymerase with a tyrosine reduced the preferential incorporation of a dNTP, relative to a ddNTP (Tabor and Richardson, 1995; Reeve and Fuller, 1995).
  • a single hydroxyl group within the polymerase is responsible for discrimination between dNTPs and ddNTPs.
  • the 3′ to 5′ exonuclease activity which enables the polymerase to remove a mis-incorporated base from the newly replicated DNA strand (proofreading activity), was eliminated because it also allows the polymerase to remove an incorporated ddNTP.
  • the 5′ to 3′ exonuclease activity was eliminated because it removes bases from the 5′ end of the reaction products. Since the reaction products are size separated during gel electrophoresis, interpretable sequence data is only obtained if the reaction products share a common endpoint.
  • the primer defines the 5′ end of the extension product and the incorporated, color-coded ddNTP defines base identity at the 3′ end of the molecule.
  • conventional DNA sequencing involves analysis of a population of DNA molecules sharing the same 5′ endpoint, but differing in the location of the ddNTP at the 3′ end of the DNA chain.
  • a directed or primer-walking sequencing strategy can be used to fill-in gaps remaining after the random phase of large-fragment sequencing, and as an efficient approach for sequencing smaller DNA fragments.
  • This strategy uses DNA primers that anneal to the template at a single site and act as a start site for chain elongation. This approach requires knowledge of some sequence information to design the primer. The sequence obtained from the first reaction is used to design the primer for the next reaction and these steps are repeated until the complete sequence is determined.
  • a primer-based strategy involves repeated sequencing steps from known into unknown DNA regions, the process minimizes redundancy, and it does not require additional cloning steps. However, this strategy requires the synthesis of a new primer for each round of sequencing.
  • This method requires that the DNA strand is synthesized to contain the flourescently-labeled base(s). This requirement limits the length of sequence that can be determined, and increases the number of manipulations that must be performed before any sequence data is obtained.
  • a related approach proposes to sequentially separate single (unlabeled) nucleotides from a strand of DNA, confine them in their original order in a solid matrix, and detect the spectroscopic emission of the separated nucleotides to reconstruct DNA sequence information (Ulmer, 1997; Mitsis and Kwagh, 1999; Dapprich, 1999). This is the approach that is being developed by Praelux, Inc., a company with a goal to develop single-molecule DNA sequencing. Theoretically, this latter method should not be as susceptible to length limitations as the former enzymatic degradation method, but it does require numerous manipulations before any sequence information can be obtained.
  • Li-cor, Inc. is developing an enzyme synthesis based strategy for single-molecule sequencing as set forth in PCT application WO 00/36151.
  • the Li-cor method involves multiply modifying each dNTP by attaching a fluorescent tag to the ⁇ -phosphate and a quenching moiety to the another site on the dNTP, preferably on the base.
  • the quenching moiety is added to prevent emission from the fluorescent tag attached to an unincorporated dNTP.
  • the fluorescent tag and quenching moiety are separated, resulting in emission from the tag.
  • the tag (contained on the pyrophosphate) flows away from the polymerase active site, but the modified (quenched) base becomes part of the DNA polymer.
  • the A-form DNA may be important for maximizing minor groove contacts between the enzyme and the DNA. If the DNA structure is affected due to base modification, enzyme fidelity and/or function maybe altered. Thus, there is still a need in the art for a fast and efficient enzymatic DNA sequencing system for single molecular DNA sequences.
  • the present invention provides a polymerizing agent modified with at least one molecular or atomic tag located at or near, associated with or covalently bonded to a site on the polymerizing agent, where a detectable property of the tag undergoes a change before, during and/or after monomer incorporation.
  • the monomers can be organic, inorganic or bio-organic monomers such as nucleotides for DNA, RNA, mixed DNA/RNA sequences, amino acids, monosaccharides, synthetic analogs of naturally occurring nucleotides, synthetic analogs of naturally occurring amino acids or synthetic analogs of naturally occurring monosaccharides, synthetic organic or inorganic monomers, or the like.
  • the present invention provides a depolymerizing agent modified with at least one molecular or atomic tag located at or near, associated with or covalently bonded to a site on the depolymerizing agent, where a detectable property of the tag undergoes a change before, during and/or after monomer removal.
  • the polymers can be DNA, RNA, mixed DNA/RNA sequences containing only naturally occurring nucleotides or a mixture of naturally occurring nucleotides and synthetic analogs thereof, polypeptide sequences containing only naturally occurring amino acids or a mixture of naturally occurring amino acids and synthetic analogs thereof, polysaccharide or carbohydrate sequences containing only naturally occurring monosaccharides or a mixture of naturally occurring monosaccharides and synthetic analogs thereof, or polymers containing synthetic organic or inorganic monomers, or the like.
  • the present invention also provides a system that enables detecting a signal corresponding to a detectable property evidencing changes in interactions between a synthesizing/polymerizing agent or a depolymerizing agent (molecule) and its substrates (monomers or depolymerizable polymers) and decoding the signal into monomer order specific information or monomer sequence information, preferably in real-time or near real-time.
  • the present invention provides a polymerase modified with at least one molecular or atomic tag located at or near, associated with, or covalently bonded to a site on the polymerase, where a detectable property of the tag undergoes a change before, during and/or after monomer incorporation.
  • the monomers can be nucleotides for DNA, RNA or mixed DNA/RNA monomers or synthetic analogs polymerizable by the polymerase.
  • the present invention provides an exonuclease modified with at least one molecular or atomic tag located at or near, associated with, or covalently bonded to a site on the exonuclease, where a detectable property of the tag undergoes a change before, during and/or after monomer release.
  • the polymers can be DNA, RNA or mixed DNA/RNA sequences comprised of naturally occurring monomers or synthetic analogs depolymerizable by the exonuclease.
  • the present invention provides a polymerase modified with at least one molecular or atomic tag located at or near, associated with, or covalently bonded to a site that undergoes a conformational change before, during and/or after monomer incorporation, where the tag has a first detection propensity when the polymerase is in a first conformational state and a second detection propensity when the polymerase is in a second conformational state.
  • the present invention provides a polymerase modified with at least one chromophore located at or near, associated with, or covalently bonded to a site that undergoes a conformational change before, during and/or after monomer incorporation, where an intensity and/or frequency of emitted light of the chromophore has a first value when the polymerase is in a first conformational state and a second value when the polymerase is in a second conformational state.
  • the present invention provides a polymerase modified with at least one fluorescently active molecular tag located at or near, associated with, or covalently bonded to a site that undergoes a conformational change before, during and/or after monomer incorporation, where the tag has a first fluorescence propensity when the polymerase is in a first conformational state and a second fluorescence propensity when the polymerase is in a second conformational state.
  • the present invention provides a polymerase modified with a molecular tag located at or near, associated with, or covalently bonded to a site that undergoes a conformational change before, during and/or after monomer incorporation, where the tag is substantially detectable when the polymerase is in a first conformational state and substantially non-detectable when the polymerase is in a second conformational state or substantially non-detectable when the polymerase is in the first conformational state and substantially detectable when the polymerase is in the second conformational state.
  • the present invention provides a polymerase modified with at least one molecular or atomic tag located at or near, associated with, or covalently bonded to a site that interacts with a tag on the released pyrophosphate group, where the polymerase tag has a first detection propensity before interacting with the tag on the released pyrophosphate group and a second detection propensity when interacting with the tag on the released pyrophosphate group.
  • this change in detection propensity is cyclical occurring as each pyrophosphate group is released.
  • the present invention provides a polymerase modified with at least one chromophore located at or near, associated with, or covalently bonded to a site that interacts with a tag on the released pyrophosphate group, where an intensity and/or frequency of light emitted by the chromophore has a first value before the chromophore interacts with the tag on the released pyrophosphate and a second value when interacting with the tag on the released pyrophosphate group.
  • this change in detection propensity is cyclical occurring as each pyrophosphate group is released.
  • the present invention provides a polymerase modified with at least one fluorescently active molecular tag located at or near, associated with, or covalently bonded to a site that interacts with a tag on the released pyrophosphate group, where the polymerase tag changes from a first state prior to release of the pyrophosphate group and a second state as the pyrophosphate group diffuses away from the site of release.
  • this change in detection propensity is cyclical occurring as each pyrophosphate group is released.
  • the present invention provides a polymerase modified with a molecular tag located at or near, associated with, or covalently bonded to a site that interacts with a tag on the released pyrophosphate group, where the polymerase tag changes from a substantially detectable state prior to pyrophosphate release to a substantially non-detectable state when the polymerase tag interacts with the tag on the pyrophosphate group after group release, or changes from a substantially non-detectable state prior to pyrophosphate release to a substantially detectable state when the polymerase tag interacts with the tag on the pyrophosphate group after group release.
  • the present invention provides a monomer polymerizing agent modified with at least one pair of molecular and/or atomic tags located at or near, associated with, or covalently bonded to sites on the polymerizing agent, where a detectable property of at least one tag of the pair undergoes a change before, during and/or after monomer incorporation or where a detectable property of at least one tag of the pair undergoes a change before, during and/or after monomer incorporation due to a change in inter-tag interaction.
  • the present invention provides a depolymerizing agent modified with at least one pair of molecular and/or atomic tags located at or near, associated with, or covalently bonded to sites on the depolymerizing agent, where a detectable property of at least one tag of the pair undergoes a change before, during and/or after monomer release or where a detectable property of at least one tag of the pair undergoes a change before, during and/or after monomer release due to a change in inter-tag interaction.
  • the present invention provides a monomer polymerizing agent modified with at least one pair of molecular and/or atomic tags located at or near, associated with, or covalently bonded to sites on the polymerizing agent, where a detectable property of at least one tag of the pair has a first value when the polymerizing agent is in a first state and a second value when the polymerizing agent is in a second state, where the polymerizing agent changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a depolymerizing agent modified with at least one pair of molecular and/or atomic tags located at or near, associated with or covalently bonded to sites on the polymerizing agent, where a detectable property of at least one tag of the pair has a first value when the depolymerizing agent is in a first state and a second value when the depolymerizing agent is in a second state, where the depolymerizing agent changes from the first state to the second state and back to the first state during a monomer release cycle.
  • the first and second states are different so that a change in the detected signal occurs.
  • a no-change result may evidence other properties of the polymerizing media or depolymerizing media.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with, or covalently bonded to sites at least one of the tags undergoes a change during monomer incorporation, where a detectable property of the pair has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state, where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with or covalently bonded to sites at least one of the tags undergoes conformational change during monomer incorporation, where the detectably property of the pair has a first value when the polymerase is in a first conformational state and a second value when the polymerase is in a second conformational state, where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a polymerase modified with at least one pair of molecules or atoms located at or near, associated with or covalently bonded to sites at least one of the tags undergoes conformational change during monomer incorporation, where the pair interact to form a chromophore when the polymerase is in a first conformational state or a second conformational state, where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with or covalently bonded to sites at least one of the tags undergoes conformational change during monomer incorporation, where the tags have a first fluorescence propensity when the polymerase is in a first conformational state and a second fluorescence propensity when the polymerase is in a second conformational state, where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with or covalently bonded to sites at least one of the tags undergoes conformational change during monomer incorporation, where the pair is substantially active when the polymerase is in a first conformational state and substantially inactive when the polymerase is in a second conformational state or substantially inactive when the polymerase is in the first conformational state and substantially active when the polymerase is in the second conformational state, where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with, or covalently bonded to sites at least one of the tags undergoes a change during and/or after pyrophosphate release during the monomer incorporation process, where a detectable property of the pair has a first value when the tag is in a first state prior to pyrophosphate release and a second value when the tag is in a second state during and/or after pyrophosphate release, where the tag changes from its first state to its second state and back to its first state during a monomer incorporation cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with or covalently bonded to sites at least one of the tags undergoes a change in position due to a conformational change in the polymerase during the pyrophosphate release process, where the detectably property of the pair has a first value when the tag is in its first position and a second value when the tag is in its second position, where the tag changes from its first position to its second position and back to its first position during a release cycle.
  • the present invention provides a polymerase modified with at least one pair of molecules or atoms located at or near, associated with or covalently bonded to sites, where the tags change relative separation due to a conformational change in the polymerase during pyrophosphate release, where the tags interact to form a chromophore having a first emission profile when the tags are a first distance apart and a second profile when the tags are a second distance apart, where the separation distance changes from its first state to its second state and back to its first state during a pyrophosphate release cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with or covalently bonded to sites, where the tags change relative separation due to a conformational change in the polymerase during pyrophosphate release, where the tags have a first fluorescence propensity when the polymerase is in a first conformational state and a second fluorescence propensity when the polymerase is in a second conformational state, where the propensity changes from its the first value to its second value and back again during a pyrophosphate release cycle.
  • the present invention provides a polymerase modified with at least one pair of molecular tags located at or near, associated with or covalently bonded to sites, where the tags change relative separation due to a conformational change in the polymerase during pyrophosphate release, where the pair is substantially fluorescently active when the tags have a first separation and substantially fluorescently inactive when the tags have a second separation or substantially fluorescently inactive when the tags have the first separation and substantially fluorescently active when the tags have the second separation, where the fluorescence activity undergoes one cycle during a pyrophosphate release cycle.
  • the present invention provides a method for determining when a monomer is incorporated into a growing molecular chain comprising the steps of monitoring a detectable property of an atomic or molecular tag, where the tag is located at or near, associated with, or covalently bonded to a site on a polymerizing agent, where the detectable property of the tag undergoes a change before, during and/or after monomer incorporation.
  • the present invention provides a method for determining when a monomer is incorporated into a growing molecular chain comprising the steps of monitoring a detectable property of an atomic or molecular tag, where the tag is located at or near, associated with, or covalently bonded to a site on a polymerizing agent, where the detectable property has a first value when the agent is in a first state and a second value when the agent is in a second state, where the agent changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the first and second states are different so that a change in the detected signal occurs.
  • a no-change result may evidence other properties of the polymerizing medium.
  • the present invention provides a method for determining when or whether a monomer is incorporated into a growing molecular chain comprising the steps of monitoring a detectable property of a tag, where the tag is located at or near, associated with, or covalently bonded to a site on a polymerase, where the site undergoes a change during monomer incorporation and where the detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state, where the values signify that the site has undergone the change and where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a method for determining when or whether a monomer is incorporated into a growing molecular chain comprising the steps of monitoring a detectable property of a tag, where the tag is located at or near, associated with, or covalently bonded to a site on a polymerase, where the site undergoes a conformational change during monomer incorporation and where the detectable property has a first value when the polymerase is in a first conformational state and a second value when the polymerase is in a second conformational state, where the values signify that the site has undergone the change and where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention provides a method for determining when or whether a monomer is incorporated into a growing molecular chain comprising the steps of exposing a tagged polymerase to light, monitoring an intensity and/or frequency of fluorescent light emitted by the tagged polymerase, where the tagged polymerase comprises a polymerase including a tag located at or near, associated with, or covalently bonded to a site that undergoes conformational change during monomer incorporation and where the tag emits fluorescent light at a first intensity and/or frequency when the polymerase is in a first conformational state and a second intensity and/or frequency when the polymerase is in a second conformational state, where the change in intensities and/or frequencies signifies that the site has undergone the change and where the polymerase changes from the first state to the second state and back to the first state during a monomer incorporation cycle.
  • the present invention also provides the above methods using a plurality of tagged polymerases permitting parallel and/or massively parallel sequencing simultaneously. Such parallelism can be used to ensure confidence. Such parallelism can also be used to quickly detect the degree of homology in DNA sequences for a given gene across species or to quickly screen patient DNA for specific genetic traits or to quickly screen DNA sequences for polymorphisms.
  • the present invention also provides a method for determining if or when a monomer is incorporated into a growing DNA chain associated with a polymerase, where a tag is located on the polymerase so that as the pyrophosphate group is released after base incorporation and prior to its diffusion away from the polymerase, the polymerase tag interacts with the tag on the pyrophosphate causing a change in a detectable property of one of the tags or a detectable property associated with both tags in the case of a fluorescent pair.
  • the first and second states are different so that a change in the detected signal occurs.
  • a no-change result may evidence other properties of the polymerizing media.
  • the present invention provides a single-molecule sequencing apparatus comprising a substrate having deposited thereon at least one tagged polymerizing agent.
  • the tagged polymerizing agent can be placed on the surface of the substrate in an appropriate polymerizing medium or the polymerizing agent can be confined in a region, area, well, groove, channel or other similar structure on the substrate.
  • the substrate can also include a monomer region, area, well, groove, channel, reservoir or other similar structure on the substrate connected to the polymerizing agent confinement structure by at least one connecting structure capable of supporting molecular transport of monomer to the polymerizing agent such as a channel, groove, or the like.
  • the substrate can include structures containing each monomer, where each structure is connected to the polymerizing agent confinement structure by a connecting structure capable of supporting molecular transport of monomer to the polymerizing agent.
  • the substrate can also be subdivided into a plurality of polymerizing agent confinement structures, where each structure is connected to a monomer reservoir.
  • each polymerizing agent confinement structure can have its own monomer reservoir or sufficient monomer reservoirs so that each reservoir contains a specific monomer.
  • the present invention also provides a single-molecule sequencing apparatus comprising a substrate having at least one tagged polymerizing agent attached to the surface of the substrate by a molecular tether or linking group, where one end of the tether or linking group is bonded to a site on the surface of the substrate and the other end is bonded to a site on the polymerizing agent or bonded to a site on a molecule strongly associated with the polymerizing agent.
  • a single-molecule sequencing apparatus comprising a substrate having at least one tagged polymerizing agent attached to the surface of the substrate by a molecular tether or linking group, where one end of the tether or linking group is bonded to a site on the surface of the substrate and the other end is bonded to a site on the polymerizing agent or bonded to a site on a molecule strongly associated with the polymerizing agent.
  • bonded to means that chemical and/or physical interactions sufficient to maintain the polymerizing agent within a given region of the substrate under normal polymerizing conditions.
  • the chemical and/or physical interactions include, without limitation, covalent bonding, ionic bonding, hydrogen bonding, a polar bonding, attractive electrostatic interactions, dipole interactions, or any other electrical or quantum mechanical interaction sufficient in to to maintain the polymerizing agent in a desired region of the substrate.
  • the substrate having tethered tagged polymerizing agent attached thereon can be placed in container containing an appropriate polymerizing medium.
  • the tagged polymerizing agent can be tethered or anchored on or within a region, area, well, groove, channel or other similar structure on the substrate capable of being filled with an appropriate polymerizing medium.
  • the substrate can also include a monomer region, area, well, groove, channel or other similar structure on the substrate connected to the polymerizing agent structure by at least one a connecting structure capable of supporting molecular transports of monomer to the polymerizing agent.
  • the substrate can include structures containing each monomer, where each structure is connected to the polymerizing agent structure by a connecting structure capable of supporting molecular transports of monomer to the polymerizing agent.
  • the substrate can also be subdivided into a plurality of polymerizing agent structures each having at least one tethered polymerizing agent, where each structure is connected to a monomer reservoir.
  • each polymerizing agent structure can have its own monomer reservoir or sufficient monomer reservoirs, one reservoir of each specific monomer.
  • the monomers for use in these apparatus including, without limitation, dNTPs, tagged dNTPs, ddNTPs, tagged ddNTPs, amino acids, tagged amino acids, mono saccharides, tagged monosaccharides or appropriate mixtures or combinations thereof depending on the type of polymer being sequenced.
  • the present invention provides a single-molecule sequencing apparatus comprising a substrate having deposited thereon at least one tagged polymerase.
  • the tagged polymerase can be placed on the surface of the substrate in an appropriate polymerizing medium or the polymerase can be confined in a region, area, well, groove, channel or other similar structure on the substrate capable of being filled with an appropriate polymerizing medium.
  • the substrate can also include a monomer region, area, well, groove, channel or other similar structure on the substrate connected to the polymerase confinement structure by at least one connecting structure capable of supporting molecular transports of monomer to the polymerase.
  • the substrate can include structures containing each monomer, where each structure is connected to the polymerase confinement structure by a connecting structure capable of supporting molecular transports of the monomer to the polymerase in the polymerase confinement structures.
  • the substrate can also be subdivided into a plurality of polymerase confinement structures, where each structure is connected to a monomer reservoir.
  • each polymerase confinement structure can have its own monomer reservoir or four reservoirs, each reservoir containing a specific monomer.
  • the present invention also provides a single-molecule sequencing apparatus comprising a substrate having at least one tagged polymerase attached to the surface of the substrate by a molecular tether or linking group, where one end of the tether or linking group is bonded to a site on the surface of the substrate and the other end is bonded (either directly or indirectly) to a site on the polymerase or bonded to a site on a molecule strongly associated with the polymerase.
  • bonded to means that chemical and/or physical interactions sufficient to maintain the polymerase within a given region of the substrate under normal polymerizing conditions.
  • the chemical and/or physical interactions include, without limitation, covalent bonding, ionic bonding, hydrogen bonding, a polar bonding, attractive electrostatic interactions, dipole interactions, or any other electrical or quantum mechanical interaction sufficient in toto to maintain the polymerase in its desired region.
  • the substrate having tethered tagged polymerizing agent attached thereon can be placed in container containing an appropriate polymerizing medium.
  • the tagged polymerizing agent can be tethered or anchored on or within a region, area, well, groove, channel or other similar structure on the substrate capable of being filled with an appropriate polymerizing medium.
  • the substrate can also include a monomer region, area, well, groove, channel or other similar structure on the substrate connected to the polymerase structure by at least one channel.
  • the substrate can include structures containing each monomer, where each structure is connected to the polymerase structure by a connecting structure that supports molecular transports of the monomer to the polymerase in the polymerase confinement structures.
  • the substrate can also be subdivided into a plurality of polymerase structures each having at least one tethered polymerase, where each structure is connected to a monomer reservoir.
  • each polymerase structure can have its own monomer reservoir or four reservoirs, each reservoir containing a specific monomer.
  • the monomers for use in these apparatus including, without limitation, dNTPs, tagged dNTPs, ddNTPs, tagged ddNTPs, or mixtures or combinations thereof.
  • the present invention provides a method for single-molecule sequencing comprising the step of supplying a plurality of monomers to a tagged polymerizing agent confined on or tethered to a substrate and monitoring a detectable property of the tag over time.
  • the method can also include a step of relating changes in the detectable property to the occurrence (timing) of monomer addition and/or to the identity of each incorporated monomer and/or to the near simultaneous determination of the sequence of incorporated monomers.
  • the present invention provides a method for single-molecule sequencing comprising the step of supplying a plurality of monomers to a tagged polymerizing agent confined on or tethered to a substrate, exposing the tagged polymerizing agent to light either continuously or periodically and measuring an intensity and/or frequency of fluorescent light emitted by the tag over time.
  • the method can further comprise relating the changes in the measured intensity and/or frequency of emitted fluorescent light from the tag over time to the occurrence (timing) of monomer addition and/or to the identity of each incorporated monomer and/or to the near simultaneous determination of the sequence of the incorporated monomers.
  • the present invention provides a method for single-molecule sequencing comprising the step of supplying a plurality of monomers to a tagged polymerase confined on or tethered to a substrate and monitoring a detectable property of the tag over time.
  • the method can also include a step of relating changes in the detectable property over time to the occurrence (timing) of monomer addition and/or to the identity of each incorporated monomer and/or to the near simultaneous determination of the sequence of the incorporated monomers.
  • the present invention provides a method for single-molecule sequencing comprising the step of supplying a plurality of monomers to a tagged polymerase confined on a substrate, exposing the tagged polymerase to light continuously or periodically and measuring an intensity and/or frequency of fluorescent light emitted by the tagged polymerase over time.
  • the method can further comprise relating changes in the measured intensity and/or frequency of emitted fluorescent light from the tag over time to the occurrence (timing) of monomer addition and/or to the identity of each incorporated monomer and/or to the near simultaneous determination of the sequence of the incorporated monomers.
  • the present invention provides cooperatively tagged polymerizing agents and tagged monomers, where a detectable property of at least one of the tags changes when the tags interact before, during and/or after monomer insertion.
  • the tag on the polymerase is positioned such that the tags interact before, during and/or after each monomer insertion.
  • tags that are released from the monomers after monomer insert such as of ⁇ and/or ⁇ phosphate tagged dNTPs, i.e., the tags reside on the ⁇ and/or ⁇ phosphate groups
  • the tag on the polymerizing agent can be designed to interact with the tag on the monomer only after the tag is released from the polymerizing agent after monomer insertion.
  • Tag placement within a polymerizing agent can be optimized to enhance interaction between the polymerase and dNTP tags by attaching the polymerase tag to sites on the polymerase that move during an incorporation event changing the relative separation of the two tags or optimized to enhance interaction between the polymerase tag and the tag on the pyrophosphate as it is release during base incorporation and prior to its diffusion away from the polymerizing agent.
  • the present invention provides cooperatively tagged polymerizing agents and tagged monomers, where a detectable property of at least one of the tags changes when the tags are within a distance sufficient to cause a measurable change in the detectable property. If the detectable property is fluorescence induced in one tag by energy transfer to the other tag or due to one tag quenching the fluorescence of the other tag or causing a measurable change in the fluorescence intensity and/or frequency, the measurable change is caused by bringing the tags into close proximity to each other, i.e., decrease the distance separating the tags.
  • the distance needed to cause a measurable change in the detectable property is within (less than or equal to) about 100 ⁇ , preferably within about 50 ⁇ , particularly within about 25 ⁇ , especially within about 15 ⁇ and most preferably within about 10 ⁇ .
  • a distance sufficient to cause a measurable change in a detectable property of a tag will depend on many parameters including the location of the tag, the nature of the tag, the solvent system, external fields, excitation source intensity and frequency band width, temperature, pressure, etc.
  • the present invention provides a tagged polymerizing agent and tagged monomer precursor(s), where an intensity and/or frequency of fluorescence light emitted by at least one tag changes when the tags interact before, during and/or after monomer insertion.
  • the present invention provides cooperatively tagged depolymerizing agents and tagged depolymerizable polymer, where a detectable property of at least one of the tags changes when the tags interact before, during and/or after monomer release.
  • the tag on the depolymerizing agent can be designed so that the tags interact before, during and/or after each monomer release.
  • the present invention provides cooperatively tagged depolymerizing agents and tagged polymers, where a detectable property of at least one of the tags changes when the tags are within a distance sufficient to cause a change in measurable change in the detectable property. If the detectable property is fluorescence induced in one tag by energy transfer to the other tag or due to one tag quenching the fluorescence of the other tag or causing a measurable change in the fluorescence intensity and/or frequency, the measurable change is caused by bringing to tags into close proximity to each other, i.e., decrease the distance separating the tags.
  • the distance needed to cause a measurable change in the detectable property is within (less than or equal to) about 100 ⁇ , preferably within about 50 ⁇ , particularly within about 25 ⁇ , especially within about 15 ⁇ and most preferably within about 10 ⁇ .
  • a distance sufficient to cause a measurable change in a detectable property of a tag will depend on many parameters including the location of the tag, the nature of the tag, the solvent system, external fields, excitation source intensity and frequency band width, temperature, pressure, etc.
  • the present invention provides a tagged depolymerizing agents and a tagged polymer, where an intensity and/or frequency of fluorescence light emitted by at least one tag changes when the tags interact before, during and/or after monomer release.
  • the present invention provides cooperatively tagged polymerase and tagged monomers, where a detectable property of at least one of the tags changes when the tags interact before, during and/or after monomer insertion.
  • the tag on the polymerase can be designed so that the tags interact before, during and/or after each monomer insertion.
  • tags that are released from the monomers after monomer insert such as of ⁇ and/or ⁇ phosphate tagged dNTPs, i.e., the tags reside on the ⁇ and/or ⁇ phosphate groups
  • the tag on the polymerizing agent can be designed to interact with the tag on the monomer only after the tag is released from the polymerizing agent after monomer insertion.
  • the polymerase tag In the first case, the polymerase tag must be located on a site of the polymerase which allows the polymerase tag to interact with the monomer tag during the monomer insertion process—initial binding and bonding into the growing polymer. While in the second case, the polymerase tag must be located on a site of the polymerase which allows the polymerase tag to interact with the monomer tag now on the released pyrophosphate prior to its diffusion away from the polymerase and into the polymerizing medium.
  • the present invention provides cooperatively tagged polymerase and tagged monomers, where a detectable property of at least one of the tags changes when the tags are within a distance sufficient or in close proximity to cause a measurable change in the detectable property.
  • the detectable property is fluorescence induced in one tag by energy transfer to the other tag or due to one tag quenching the fluorescence of the other tag or causing a measurable change in the fluorescence intensity and/or frequency
  • the measurable change is caused by bringing to tags into close proximity to each other, i.e., decrease the distance separating the tags.
  • the distance or close proximity is a distance between about 100 ⁇ and about 10 ⁇ .
  • the distance is less than or equal to about 100 ⁇ , preferably less than or equal to about 50 ⁇ , particularly less than or equal to about 25 ⁇ , especially less than or equal to about 15 ⁇ and most preferably less than or equal to about 10 ⁇ .
  • a distance sufficient to cause a measurable change in a detectable property of a tag will depend on many parameters including the location of the tags, the nature of the tags, the solvent system (polymerizing medium), external fields, excitation source intensity and frequency band width, temperature, pressure, etc.
  • the present invention provides a tagged polymerase and tagged monomer precursors, where the tags form a fluorescently active pair such as a donor-acceptor pair and an intensity and/or frequency of fluorescence light emitted by at least one tag (generally the acceptor tag in donor-acceptor pairs) changes when the tags interact.
  • the present invention provides a tagged polymerase and a tagged monomer precursors, where the tags form a fluorescently active pair such as a donor-acceptor pair and an intensity and/or frequency of fluorescence light emitted by at least one tag (generally the acceptor tag in donor-acceptor pairs) changes when the tags are a distance sufficient or in close proximity to change either the intensity and/or frequency of the fluorescent light.
  • the distance or close proximity is a distance between about 100 ⁇ and about 10 ⁇ .
  • the distance is less than or equal to about 100 ⁇ , preferably less than or equal to about 50 ⁇ , particularly less than or equal to about 25 ⁇ , especially less than or equal to about 15 ⁇ and most preferably less than or equal to about 10 ⁇ .
  • a distance sufficient to cause a measurable change in a detectable property of a tag will depend on many parameters including the location of the tag, the nature of the tag, the solvent system, external fields, excitation source intensity and frequency band width, temperature, pressure, etc.
  • the present invention provides a single-molecule sequencing apparatus comprising a container having at least one tagged polymerase confined on or tethered to an interior surface thereof and having a solution containing a plurality of tagged monomers in contact with the interior surface.
  • the present invention provides a method for single-molecule sequencing comprising the step of supplying a plurality of tagged monomers to a tagged polymerase confined on an interior surface of a container, exposing the tagged polymerase to light and measuring an intensity and/or frequency of fluorescent light emitted by the tagged polymerase during each successive monomer addition or insertion into a growing polymer chain.
  • the method can further comprise relating the measured intensity and/or frequency of emitted fluorescent light to incorporation events and/or to the identification of each inserted or added monomer resulting in a near real-time or real-time readout of the sequence of the a growing nucleic acid sequence—DNA sequence, RNA sequence or mixed DNA/RNA sequences.
  • the present invention also provides a system for retrieving stored information comprising a molecule having a sequence of known elements representing a data stream, a single-molecule sequencer comprising a polymerase having at least one tag associated therewith, an excitation source adapted to excite at least one tag on the polymerase, and a detector adapted to detect a response from the excited tag on the polymerase, where the response from the at least one tag changes during polymerization of a complementary sequence of elements and the change in response represents a content of the data stream.
  • the present invention also provides a system for determining sequence information from a single-molecule comprising a molecule having a sequence of known elements, a single-molecule sequencer comprising a polymerase having at least one tag associated therewith, a excitation source adapted to excite at least one tag on the polymerase, and a detector adapted to detect a response from the excited tag on the polymerase, where the response from at least one tag changes during polymerization of a complementary sequence of elements representing the element sequence of the molecule.
  • the present invention also provides a system for determining sequence information from a single-molecule comprising a molecule having a sequence of known elements, a single-molecule sequencer comprising a polymerase having at least one fluorescent tag associated therewith, an excitation light source adapted to excite at least one fluorescent tag on the polymerase and/or monomer and a fluorescent light detector adapted to detect at least an intensity of emitted fluorescent light from at least one fluorescent tag on the polymerase and/or monomer, where the signal intensity changes each time a new nucleotide or nucleotide analog is polymerized into a complementary sequence and either the duration of the emission or lack of emission or the wavelength range of the emitted light evidences the particular nucleotide or nucleotide analog polymerized into the sequence so that at the completion of the sequencing the data stream is retrieved.
  • the present invention also provides a system for storing and retrieving data comprising a sequence of nucleotides or nucleotide analogs representing a given data stream; a single-molecule sequencer comprising a polymerase having at least one fluorescent tag covalently attached thereto; an excitation light source adapted to excite the at least one fluorescent tag on the polymerase and/or monomer; and a fluorescent light detector adapted to detect emitted fluorescent light from at least one fluorescent tag on the polymerase and/or monomer, where at least one fluorescent tag emits or fails to emit fluorescent light each time a new nucleotide or nucleotide analog is polymerized into a complementary sequence and either the duration of the emission or lack of emission or the wavelength range of the emitted light evidences the particular nucleotide or nucleotide analog polymerized into the sequence so that at the completion of the sequencing the data stream is retrieved.
  • monomer as used herein means any compound that can be incorporated into a growing molecular chain by a given polymerase.
  • monomers include, without limitations, naturally occurring nucleotides (e.g., ATP, GTP, TTP, UTP, CTP, DATP, dGTP, dTTP, dUTP, dCTP, synthetic analogs), precursors for each nucleotide, non-naturally occurring nucleotides and their precursors or any other molecule that can be incorporated into a growing polymer chain by a given polymerase.
  • amino acids naturally occurring for protein or protein analog synthesis, mono saccharides for carbohydrate synthesis or other monomeric syntheses.
  • polymerase as used herein means any molecule or molecular assembly that can polymerize a set of monomers into a polymer having a predetermined sequence of the monomers, including, without limitation, naturally occurring polymerases or reverse transcriptases, mutated naturally occurring polymerases or reverse transcriptases, where the mutation involves the replacement of one or more or many amino acids with other amino acids, the insertion or deletion of one or more or many amino acids from the polymerases or reverse transcriptases, or the conjugation of parts of one or more polymerases or reverse transcriptases, non-naturally occurring polymerases or reverse transcriptases.
  • polymerase also embraces synthetic molecules or molecular assembly that can polymerize a polymer having a pre-determined sequence of monomers, or any other molecule or molecular assembly that may have additional sequences that facilitate purification and/or immobilization and/or molecular interaction of the tags, and that can polymerize a polymer having a pre-determined or specified or templated sequence of monomers.
  • the present invention provides a composition
  • a composition comprising a polymerizing agent including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the agent, where a detectable property of the tag undergoes a change before, during and/or after monomer incorporation.
  • the present invention provides a composition
  • a composition comprising a polymerizing agent including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the agent, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer incorporation.
  • the present invention provides a composition
  • a depolymerizing agent including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the agent, where a detectable property of the tag undergoes a change before, during and/or after monomer removal.
  • the present invention provides a composition
  • a composition comprising a polymerizing agent including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the agent, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer removal.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the polymerase, where a detectable property of the tag undergoes a change before, during and/or after monomer incorporation.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the polymerase, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer incorporation.
  • the present invention provides a composition
  • a composition comprising an exonuclease including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the agent, where a detectable property of the tag undergoes a change before, during and/or after monomer removal.
  • the present invention provides a A composition
  • a composition comprising an exonuclease including at least one molecular and/or atomic tag located at or near, associated with or covalently bonded to a site on the agent, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer removal.
  • the present invention provides a composition comprising an enzyme modified to produce a detectable response prior to, during and/or after interaction with an appropriately modified monomer, where the monomers are nucleotides, nucleotide analogs, amino acids, amino acid analogs, monosaccarides, monosaccaride analogs or mixtures or combinations thereof.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one molecular tag located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the tag has a first detection propensity when the polymerase is in a first conformational state and a second detection propensity when the polymerase is in a second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one chromophore located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where an intensity and/or frequency of emitted light of the tag has a first value when the polymerase is in a first conformational state and a second value when the polymerase is in a second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one molecular tag located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the tag has a first fluorescence propensity when the polymerase is in a first conformational state and a second fluorescence propensity when the polymerase is in a second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerase including a molecular tag located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the tag is substantially active when the polymerase is in a first conformational state and substantially inactive when the polymerase is in a second conformational state or substantially inactive when the polymerase is in the first conformational state and substantially active when the polymerase is in the second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerizing agent including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the agent, where a detectable property of at least one of the tags undergoes a change before, during and/or after monomer incorporation.
  • the present invention provides a composition
  • a composition comprising a polymerizing agent including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the agent, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer incorporation.
  • the present invention provides a composition
  • a depolymerizing agent including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the agent, where a detectable property of at least one of the tags undergoes a change before, during and/or after monomer removal.
  • the present invention provides a composition
  • a depolymerizing agent including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the agent, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer removal.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the polymerase, where a detectable property of at least one of the tags undergoes a change before, during and/or after monomer incorporation.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the polymerase, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer incorporation.
  • the present invention provides a composition
  • a composition comprising an exonuclease including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the polymerase, where a detectable property of at least one of the tags undergoes a change before, during and/or after monomer removal.
  • the present invention provides a composition
  • a composition comprising an exonuclease including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site of the polymerase, where a detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state during monomer removal.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the detectable property of the pair has a first value when the polymerase is in a first conformational state and a second value when the polymerase is in a second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one pair of molecules or atoms located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the pair interact to form a chromophore when the polymerase is in a first conformational state or a second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the tags have a first fluorescence propensity when the polymerase is in a first conformational state and a second fluorescence propensity when the polymerase is in a second conformational state.
  • the present invention provides a composition
  • a composition comprising a polymerase including at least one pair of molecular tags located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation, where the pair is substantially active when the polymerase is in a first conformational state and substantially inactive when the polymerase is in a second conformational state or substantially inactive when the polymerase is in the first conformational state and substantially active when the polymerase is in the second conformational state.
  • the present invention provides a method for determining when a monomer is incorporated into a growing molecular chain comprising the steps of monitoring a detectable property of a tag, where the tag is located at or near, associated with or covalently bonded to a site on a polymerase or associated with or covalently bonded to a site on the monomer, where the site undergoes a change during monomer incorporation and where the detectable property has a first value when the polymerase is in a first state and a second value when the polymerase is in a second state and cycles from the first value to the second value during each monomer addition.
  • the present invention provides a method for determining when a monomer is incorporated into a growing molecular chain comprising the steps of monitoring a detectable property of a tag, where the tag is located at or near, associated with or covalently bonded to a site on a polymerase or associated with or covalently bonded to a site on the monomer, where the site undergoes a conformational change during monomer incorporation and where the detectable property has a first value when the polymerase is in a first conformational state and a second value when the polymerase is in a second conformational state and cycles from the first value to the second value during each monomer addition.
  • the present invention provides a method for determining when a monomer is incorporated into a growing molecular chain comprising the steps of exposing a tagged polymerase to light, monitoring an intensity and/or frequency of fluorescent light emitted by the tagged polymerase and/or monomer, where the tagged polymerase comprises a polymerase including a tag located at or near, associated with or covalently bonded to a site that undergoes conformational change during monomer incorporation or associated with or covalently bonded to a site on the monomer and where the tag emits fluorescent light at a first intensity and/or frequency when the polymerase is in a first conformational state and a second intensity and/or frequency when the polymerase is in a second conformational state and cycles from the first value to the second value during each monomer addition.
  • the present invention provides a composition comprising a single-molecule sequencing apparatus comprising a substrate having a chamber or chip surface in which at least one tagged polymerase is confined therein and a plurality of chambers, each of which includes a specific monomer and a plurality of channels interconnecting the chambers, where each replication complex is sufficiently distant to enable data collection from each complex individually.
  • the present invention provides a method for single-molecule sequencing comprising the steps of supplying a plurality of monomers to a tagged polymerase confined on a substrate, exposing the tagged polymerase to light and measuring an intensity and/or frequency of fluorescent light emitted by the tagged polymerase.
  • the method can further comprise the step of relating the measured intensity and/or frequency of emitted fluorescent light to incorporation of a specific monomer into a growing DNA chain.
  • the present invention provides a composition comprising a cooperatively tagged polymerizing agent and tagged monomers, where a detectable property of at least one of the tags changes when the tags interact.
  • the present invention provides a composition comprising a cooperatively tagged depolymerizing agent and tagged depolymerizable monomers, where a detectable property of at least one of the tags changes when the tags interact.
  • the present invention provides a composition comprising a cooperatively tagged polymerase and tagged monomers, where a detectable property of at least one of the tags changes when the tags interact.
  • the present invention provides a composition comprising a cooperatively tagged polymerase and tagged monomers, where a detectable property of at least one of the tags changes when the tag are within within a distance sufficient to cause a change in the intensity and/or frequency of emitted fluorescent light.
  • the present invention provides a composition comprising a tagged polymerase and tagged monomer precursors, where an intensity and/or frequency of fluorescence light emitted by at least one tag changes when the tags interact.
  • the present invention provides a composition comprising a tagged polymerase and a tagged monomer precursors, where an intensity and/or frequency of fluorescence light emitted by at least one tag changes when the tags are within a distance sufficient to cause a change in the intensity and/or frequency of emitted fluorescent light.
  • the present invention provides a single-molecule sequencing apparatus comprising a container having at least one tagged polymerase confined on an interior surface thereof and having a solution containing a plurality of tagged monomers in contact with the interior surface or a subset of tagged monomers and a subset of untagged monomers which together provide all monomers precursor for polymerization.
  • the present invention provides a method for single-molecule sequencing comprising the steps of supplying a plurality of tagged monomers to a tagged polymerase confined on an interior surface of a container, exposing the tagged polymerase to light and measuring an intensity and/or frequency of fluorescent light emitted by the tagged polymerase.
  • the method can further comprise relating the measured intensity and/or frequency of emitted fluorescent light to incorporation of a specific monomer into a growing DNA chain.
  • the present invention provides a system for retrieving stored information comprising: (a) a molecule having a sequence of elements representing a data stream; (b) a single-molecule sequencer comprising a polymerase having at least one tag associated therewith; (c) an excitation source adapted to excite the at least one tag on the polymerase; and (d) a detector adapted to detect a response from the tag on the polymerase or on the monomers; where the response from at least one tag changes during polymerization of a complementary sequence of elements and the change in response represents a data stream content.
  • the present invention provides a system for determining sequence information from a single-molecule comprising: (a) a molecule having a sequence of elements; (b) a single-molecule sequencer comprising a polymerase having at least one tag associated therewith; (c) an excitation source adapted to excite at least one tag on the polymerase or on the monomers; and (d) a detector adapted to detect a response from the tag on the polymerase; where the response from at least one tag changes during polymerization of a complementary sequence of elements representing the element sequence of the molecule.
  • the present invention provides a system for determining sequence information from an individual molecule comprising: (a) a molecule having a sequence of elements; (b) a single-molecule sequencer comprising a polymerase having at least one fluorescent tag associated therewith; (c) an excitation light source adapted to excite the at least one fluorescent tag on the polymerase or on the monomers; and (d) a fluorescent light detector adapted to detect at least an intensity of emitted fluorescent light from the at least one fluorescent tag on the polymerase; where the intensity change of at least one fluorescent tag emits or fails to emit fluorescent light each time a new nucleotide or nucleotide analog is polymerized into a complementary sequence and either the duration of the emission or lack of emission or the wavelength range of the emitted light evidences the particular nucleotide or nucleotide analog polymerized into the sequence so that at the completion of the sequencing the data stream is retrieved.
  • the present invention provides a system for storing and retrieving data comprising: (a) a sequence of nucleotides or nucleotide analogs representing a given data stream; (b) a single-molecule sequencer comprising a polymerase having at least one fluorescent tag covalently attached thereto; (c) an excitation light source adapted to excite at least one fluorescent tag on the polymerase; and (d) a fluorescent light detector adapted to detect emitted fluorescent light from at least one fluorescent tag on the polymerase; where at least one fluorescent tag emits or fails to emit fluorescent light each time a new nucleotide or nucleotide analog is polymerized into a complementary sequence and either the duration of the emission or lack of emission or the wavelength range of the emitted light evidences the particular nucleotide or nucleotide analog polymerized into the sequence so that at the completion of the sequencing the data stream is retrieved.
  • the present invention provides a system for storing and retrieving data comprising: (a) a sequence of nucleotides or nucleotide analogs representing a given data stream; (b) a single-molecule sequencer comprising a polymerase having at least one fluorescent tag covalently attached thereto; (c) an excitation light source adapted to excite the at least one fluorescent tag on the polymerase or the monomers; and (d) a fluorescent light detector adapted to detect emitted fluorescent light from at least one fluorescent tag on the polymerase or the monomers; where at least one fluorescent tag emits or fails to emit fluorescent light each time a new nucleotide or nucleotide analog is polymerized into a complementary sequence and either the duration of the emission or lack of emission or the wavelength range of the emitted light evidences the particular nucleotide or nucleotide analog polymerized into the sequence so that at the completion of the sequencing the data stream is retrieved.
  • the present invention provides a method for sequencing a molecular sequence comprising the steps of: (a) a sequenced of nucleotides or nucleotide analogs representing a given data stream; (b) a single-molecule sequencer comprising a polymerase having at least one fluorescent tag covalently attached thereto; (c) an excitation light source adapted to excite at least one fluorescent tag on the polymerase or the monomers; and (d) a fluorescent light detector adapted to detect emitted fluorescent light from at least one fluorescent tag on the polymerase; where at least one fluorescent tag emits or fails to emit fluorescent light each time a new nucleotide or nucleotide analog is polymerized into a complementary sequence and either the duration of the emission or lack of emission or the wavelength range of the emitted light evidences the particular nucleotide or nucleotide analog polymerized into the sequence so that at the completion of the sequencing the data stream is retrieved.
  • the present invention provides a method for synthesizing a ⁇ -phosphate modified nucleotide comprising the steps of attaching a molecular tag to a pyrophosphate group and contacting the modified pyrophosphate with a dNMP to produce a ⁇ -phosphate tagged dNTP.
  • the present invention provides a method for 5′ end-labeling a biomolecule comprising the step of contacting the biomolecule with a kinase able to transfer a ⁇ -phosphate of a ⁇ -phosphate labeled ATP to the 5′ end of the biomolecule resulting in a covalently modified biomolecule.
  • the present invention provides a method for end-labeling a polypeptide or carbohydrate comprising the step of contacting the polypeptide or carbohydrate with an agent able to transfer an atomic or molecular tag to either a carboxy or amino end of a protein or polypeptide or to either the ⁇ -phosphate of a ⁇ -phosphate labeled ATP to the 5′ end of the biomolecule resulting in a covalently modified biomolecule.
  • FIG. 1 depicts FRET activity as a function of distance separating the fluorescent donor and acceptor
  • FIG. 2 depicts the open and closed ternary complex forms of the large fragment of Taq DNA pol I (Klentaq 1);
  • FIGS. 3 A-C depicts an overlay between 3 ktq (closed ‘black’) and 1 tau (open ‘light blue’), the large fragment of faq DNA polymerase I;
  • FIG. 4 depicts an image of a 20% denaturing polyacryamide gel containing size separated radiolabeled products from DNA extension experiments involving ⁇ -ANS-phosphate-dATP;
  • FIG. 5 depicts an image of (A) the actual gel, (B) a lightened phosphorimage and (C) an enhanced phosphorimage of products generated in DNA extension reactions using ⁇ -ANS-phosphate-dNTPs;
  • FIG. 6 depicts an image of (A) 6% denaturing polyacrylamide gel, (B) a lightened phosphorimage of the actual gel, and (C) an enhanced phosphorimage of the actual gel containing products generated in DNA extension reactions using ⁇ -ANS-phosphate-dNTPs;
  • the inventors have devised a methodology using tagged monomers such as dNTPs and/or tagged polymerizing agents such as polymerase and/or tagged agents associated with the polymerizing agent such as polymerase associated proteins or probes to directly readout the exact monomer sequence such as a base sequence of an RNA or DNA sequence during polymerase activity.
  • the methodology of this invention is adaptable to protein synthesis or to carbohydrate synthesis or to the synthesis of any molecular sequence where the sequence of monomers provides usable information such as the sequence of a RNA or DNA molecule, a protein, a carbohydrate, a mixed biomolecule or an inorganic or organic sequence of monomers which stores a data stream.
  • the methods and apparatuses using these methods are designed to create new ways to address basic research questions such as monitoring conformation changes occurring during replication and assaying polymerase incorporation fidelity in a variety of sequence contexts.
  • the single-molecule detection systems of this invention are designed to improve fluorescent molecule chemistry, computer modeling, base-calling algorithms, and genetic engineering of biomolecules, especially for real-time or near real-time sequencing.
  • the inventors have also found that the methodology can be adapted to depolymerizing agents such as exonucleases where the polymer sequence is determined by depolymerization instead of polymerization.
  • the single-molecule systems of this invention are amendable to parallel and/or massively parallel assays, where tagged polymerases are patterned in arrays on a substrate. The data collected from such arrays can be used to improve sequence confidence and/or to simultaneously sequence DNA regions from many different sources to identify similarities or differences.
  • the pattern of emission signals is collected, either directly, such as by an Intensitifed Charge Coupled Devise (ICCD) or through an intermediate or series of intermediates to amplify signal prior to electronic detection, where the signals are decoded and confidence values are assigned to each base to reveal the sequence complementary to that of the template.
  • ICCD Intensitifed Charge Coupled Devise
  • the present invention also provides techniques for amplifying the fluorescent light emitted from a fluorescent tag using physical light amplification techniques or molecular cascading agent to amplify the light produced by single-molecular fluorescent events.
  • the single-molecule DNA sequencing systems of this invention have the potential to replace current DNA sequencing technologies, because the methodology can decrease time, labor, and costs associated with the sequencing process, and can lead to highly scalable sequencing systems, improving the DNA sequence discovery process by at least one to two orders of magnitude per reaction.
  • the single-molecule DNA sequencing technology of this invention can: (1) make it easier to classify an organism or identify variations within an organism by simply sequencing the genome or a portion thereof; (2) make rapid identification of a pathogen or a genetically-modified pathogen easier, especially in extreme circumstances such as in pathogens used in warfare; and (3) make rapid identification of persons for either law enforcement and military applications easier.
  • One embodiment of the single-molecule sequencing technology of this invention involves strategically positioning a pair of tags on a DNA polymerase so that as a dNTP is incorporated during the polymerization reaction, the tags change relative separation.
  • This relative change causes a change in a detectable property, such as the intensity and/or frequency of fluorescence from one or both of the tags.
  • a time profile of these changes in the detectable property evidences each monomer incorporation event and provides evidence about which particular dNTP is being incorporated at each incorporation event.
  • the pair of tags do not have to be covalently attached to the polymerase, but can be attached to molecules that associate with the polymerase in such a way that the relative separation of the tags change during base incorporation.
  • Another embodiment of the single-molecule sequencing technology of this invention involves a single tag strategically positioned on a DNA polymerase that interacts with a tag on a dNTP or separate tags on each dNTP.
  • the tags could be different for each dNTP such as color-coded tags which emit a different color of fluorescent light.
  • the identity of the base is indicated by a signature fluorescent signal (color) or a change in a fluorescent signal intensity and/or frequency.
  • the rate of polymerase incorporation can be varied and/or controlled to create an essentially “real-time” or near “real-time” or real-time readout of polymerase activity and base sequence. Sequence data can be collected at a rate of >100,000 bases per hour from each polymerase.
  • the tagged polymerases each include a donor tag and an acceptor tag situated or located on or within the polymerase, where the distance between the tags changes during dNTP binding, dNTP incorporation and/or chain extension. This change in inter-tag distance results in a change in the intensity and/or wavelength of emitted fluorescent light from the fluorescing tag. Monitoring the changes in intensity and/or frequency of the emitted light provides information or data about polymerization events and the identity of incorporated bases.
  • the tags on the polymerases are designed to interact with the tags on the dNTPs, where the interaction changes a detectable property of one or both of the tags.
  • Each fluorescently tagged polymerase is monitored for polymerization using tagged dNTPs to determine the efficacy of base incorporation data derived therefrom.
  • Specific assays and protocols have been developed along with specific analytical equipment to measure and quantify the fluorescent data allowing the determination and identification of each incorporated dNTP.
  • the inventors have identified tagged dNTPs that are polymerized by suitable polymerases and have developed software that analyze the fluorescence emitted from the reaction and interpret base identity.
  • appropriate fluorescently active pairs are well-known in the art and commercially available from such vendors as Molecular Probes located in Oregon or Biosearch Technologies, Inc. in Novato, Calif.
  • the tagged DNA polymerase for use in this invention are genetically engineered to provide one or more tag binding sites that allow the different embodiments of this invention to operate.
  • a suitable polymerase candidate is identified, specific amino acids within the polymerase are mutated and/or modified such reactions well-known in the art; provided, however, that the mutation and/or modification do not significantly adversely affect polymerization efficiency.
  • the mutated and/or modified amino acids are adapted to facilitate tag attachment such as a dye or fluorescent donor or acceptor molecule in the case of light activated tags.
  • the engineered polymerase can be contacted with one or more appropriate tags and used in the apparatuses and methods of this invention.
  • the single-molecule DNA sequencing system of this invention can significantly reduce time, labor, and costs associated with the sequencing process and is highly scalable.
  • the single-molecule DNA sequencing system of this invention (1) can improve the sequence discovery process by at least two orders of magnitude per reaction; (2) is not constrained by the length limitations associated with the degradation-based, single-molecule methods; and (3) allows direct sequencing of desired (target) DNA sequences, especially genomes without the need for cloning or PCR amplification, both of which introduce errors in the sequence.
  • the systems of this invention can make easier the task of classifying an organism or identifying variations within an organism by simply sequencing the genome in question or any desired portion of the genome.
  • the system of this invention is adapted to rapidly identify pathogens or engineered pathogens, which has importance for assessing health-related effects, and for general DNA diagnostics, including cancer detection and/or characterization, genome analysis, or a more comprehensive form of genetic variation detection.
  • the single-molecule DNA sequencing system of this invention can become an enabling platform technology for single-molecule genetic analysis.
  • the single-molecule sequencing systems of this invention have the following advantages: (1) the systems eliminates sequencing reaction processing, gel or capillary loading, electrophoresis, and data assembly; (2) the systems results in significant savings in labor, time, and costs; (3) the systems allows near real-time or real-time data acquisition, processing and determination of incorporation events (timing, duration, etc.), base sequence, etc.; (4) the systems allows parallel or massively parallel sample processing in microarray format; (5) the systems allows rapid genome sequencing, in time frames of a day or less; (6) the systems requires very small amount of material for analysis; (7) the systems allows rapid genetic identification, screening and characterization of animals including humans or pathogen; (8) the systems allows large increases in sequence throughput; (9) the system can avoid error introduced in PCR, RT-PCR, and transcription processes; (10) the systems can allow accurate sequence information for allele-specific mutation detection; (11) the systems allows rapid medical diagnostics, e.g., Single Nucleotide Polymorphism (SNP) detection; (12) the systems allows improvement
  • a single tag is attached to an appropriate site on a polymerase and a unique tag is attached to each of the four nucleotides: dATP, dTTP, dCTP and dGTP.
  • the tags on each dNTPs are designed to have a unique emission signature (i.e., different emission frequency spectrum or color), which is directly detected upon incorporation.
  • a characteristic fluorescent signal or base emission signature is emitted due to the interaction of polymerase tag and the dNTP tag.
  • the fluorescent signals i.e., the emission intensity and/or frequency, are then detected and analyzed to determine DNA base sequence.
  • One criteria for selection of the tagged polymerase and/or dNTPs for use in this invention is that the tags on either the polymerase and/or the dNTPs do not interfere with Watson-Crick base-pairing or significantly adversely impact polymerase activity.
  • the inventors have found that dNTPs containing tags attached to the terminal (gamma) phosphate are incorporated by a native Taq polymerase either in combination with untagged dNTPs or using only tagged dNTPs. Tagging the dNTPs on the ⁇ and/or ⁇ phosphate group is preferred because the resulting DNA strands do not include any of the dNTP tags in their molecular make up, minimizing enzyme distortion and background fluorescence.
  • One embodiment of the sequencing system of this invention involves placing a fluorescent donor such as fluorescein or a fluorescein-type molecule on the polymerase and unique fluorescent acceptors such as a d-rhodamine or a similar molecule on each dNTP, where each unique acceptor, when interacting with the donor on the polymerase, generates a fluorescent spectrum including at least one distinguishable frequency or spectral feature.
  • a fluorescent donor such as fluorescein or a fluorescein-type molecule
  • unique fluorescent acceptors such as a d-rhodamine or a similar molecule on each dNTP
  • Another embodiment of the sequencing system of this invention involves a fluorescent tag on the polymerase and unique quenchers on the dNTPs, where the quenchers preferably have distinguishable quenching efficiencies for the polymerase tag. Consequently, the identity of each incoming quencher tagged dNTP is determined by its unique quenching efficiency of the emission of the polymerase fluorescent tag. Again, the signals produced during incorporation are detected and analyzed to determine each base incorporated, the sequence of which generates the DNA base sequence.
  • Suitable polymerizing agents for use in this invention include, without limitation, any polymerizing agent that polymerizes monomers relative to a specific template such as a DNA or RNA polymerase, reverse transcriptase, or the like or that polymerizes monomers in a step-wise fashion.
  • Suitable polymerases for use in this invention include, without limitation, any polymerase that can be isolated from its host in sufficient amounts for purification and use and/or genetically engineered into other organisms for expression, isolation and purification in amounts sufficient for use in this invention such as DNA or RNA polymerases that polymerize DNA, RNA or mixed sequences, into extended nucleic acid polymers.
  • Preferred polymerases for use in this invention include mutants or mutated variants of native polymerases where the mutants have one or more amino acids replaced by amino acids amenable to attaching an atomic or molecular tag, which have a detectable property.
  • Exemplary DNA polymerases include, without limitation, HIV1-Reverse Transcriptase using either RNA or DNA templates, DNA pol I from T. aquaticus or E. coli , Bateriophage T4 DNA pol, T7 DNA pol or the like.
  • Exemplary RNA polymerases include, without limitation, T7 RNA polymerase or the like.
  • Suitable depolymerizing agents for use in this invention include, without limitation, any depolymerizing agent that depolymerizes monomers in a step-wise fashion such as exonucleases in the case of DNA, RNA or mixed DNA/RNA polymers, proteases in the case of polypeptides and enzymes or enzyme systems that sequentially depolymerize polysaccharides.
  • Suitable monomers for use in this invention include, without limitation, any monomer that can be step-wise polymerized into a polymer using a polymerizing agent.
  • Suitable nucleotides for use in this invention include, without limitation, naturally occurring nucleotides, synthetic analogs thereof, analog having atomic and/or molecular tags attached thereto, or mixtures or combinations thereof.
  • Suitable atomic tag for use in this invention include, without limitation, any atomic element amenable to attachment to a specific site in a polymerizing agent or DNTP, especially Europium shift agents, nmr active atoms or the like.
  • Suitable atomic tag for use in this invention include, without limitation, any atomic element amenable to attachment to a specific site in a polymerizing agent or dNTP, especially fluorescent dyes such as d-Rhodamine acceptor dyes including dichloro[R110], dichloro[R6G], dichloro[TAMRA], dichloro [ROX] or the like, fluorescein donor dye including fluorescein, 6-FAM, or the like; Acridine including Acridine orange, Acridine yellow, Proflavin, pH 7, or the like; Aromatic Hydrocarbon including 2-Methylbenzoxazole, Ethyl p-dimethylaminobenzoate, Phenol, Pyrrole, benzene, toluene, or the like; Arylmethine Dyes including Auramine O, Crystal violet, H2O, Crystal violet, glycerol, Malachite Green or the like; Coumarin dyes including 7-Methoxycoumarin-4-acetic
  • Taq DNA polymerase I Thermus aquaticus —is ideally suited for use in the single-molecule apparatuses, systems and methods of this invention.
  • Taq DNA Polymerase sometimes simply referred to herein as Taq, has many attributes that the inventors can utilize in constructing tagged polymerases for use in the inventions disclosed in this application.
  • ordinary artisans will recognize that other polymerases can be adapted for use in the single-molecule sequencing systems of this invention.
  • Taq DNA polymerase I tolerates so many mutations within or near its active site (as reviewed in Patel et al, J. Mol Biol., volume 308, pages 823-837, and incorporated herein by reference), the enzyme is more tolerant of enzyme tagging modification(s) and also able to incorporate a wider range of modified nucleotide substrates.
  • the program compares structural data associated with the Taq polymerase in its open and closed form to identify regions in the polymerase structure that are optimally positioned to optimize the difference in conformation extremes between a tag on the polymerase and the dNTP or to optimize a change in separation between two tags on the polymerase, thereby increasing or maximizing changes in a detectable property of one of the tags or tag pair.
  • Taq DNA Polymerase is Efficiently Expressed in E. coli
  • the Taq DNA polymerase is efficiently expressed in E. coli allowing efficient production and purification of the nascent polymerase and variants thereof for rapid identification, characterization and optimization of an engineered Taq DNA polymerase for use in the single-molecule DNA sequencing systems of this invention.
  • the Taq DNA polymerase contains no cysteines, which allows the easy generation of cysteine-containing mutants in which a single cysteine is placed or substituted for an existing amino acid at strategic sites, where the inserted cysteine serves as a tag attachment site.
  • native Taq DNA polymerase may not represent an optimal polymerase for sequencing system of this invention because it is not a very processive polymerase (50-80 nucleotides are incorporated before dissociation), the low processivity may be compensated for by appropriately modifying the base calling software.
  • the processivity of the Taq DNA Polymerase can be enhanced through genetic engineering by inserting into the polymerase gene a processivity enhancing sequence. Highly processive polymerases are expected to minimize complications that may arise from template dissociation effects, which can alter polymerization rate.
  • the processivity of Taq can be genetically altered by introducing the 76 amino acid ‘processivity domain’ from T7 DNA polymerase between the H and H, helices (at the tip of ‘thumb’ region within the polymerase) of Taq.
  • the processivity domain also includes the thioredoxin binding domain (TBD) from T7 DNA polymerase causing the Taq polymerase to be thioredoxin-dependent increasing both the processivity and specific activity of Taq polymerase.
  • TBD thioredoxin binding domain
  • Taq DNA Polymerase Possesses a 5′ to 3′ Exonuclease Activity and is Thermostable
  • Single-stranded M13 DNA and synthetic oligonucleotides are used in the initial studies. After polymerase activity is optimized, the sequencing system can be used to directly determine sequence information from an isolated chromosome —a double-stranded DNA molecule. Generally, heating a sample of double-stranded DNA is sufficient to produce or maintain the double-stranded DNA in stranded DNA form for sequencing.
  • the 5′ to 3′ exonuclease activity of the native Taq DNA polymerase in the enzyme engineered for single-molecule DNA sequencing is retained. This activity of the polymerase is exploited by the ‘TaqMan’ assay.
  • the exonuclease activity removes a duplex strand that may denature downstream from the replication site using a nick-translation reaction mechanism. Synthesis from the engineered polymerase is initiated either by a synthetic oligonucleotide primer (if a specific reaction start is necessary) or by a nick in the DNA molecule (if multiple reactions are processed) to determine the sequence of an entire DNA molecule.
  • the Polymerase is Free from 3′ to 5′ Exonuclease Activity
  • the Taq DNA polymerase is does not contain 3′ to 5′ exonuclease activity, which means that the polymerase cannot replace a base, for which fluorescent signal was detected, with another base which would produce another signature fluorescent signal.
  • the error rate of engineered polymerases of this invention are assayed by determining their error rates in synthesizing known sequences.
  • the error rate determines the optimal number of reactions to be run in parallel so that sequencing information can be assigned with confidence.
  • the optimal number can be 1 or 10 or more.
  • base context influences polymerase accuracy and reaction kinetics, and this information is used to assign confidence values to individual base calls.
  • Taq DNA Polymerase is the Enzyme of Choice for Single-molecule DNA Sequencing
  • FRET-based fluorescence resonance energy transfer-based
  • a FRET-based method exists when the emission from an acceptor is more intense than the emission from a donor, i.e., the acceptor has a higher fluorescence quantum yield than the donor at the excitation frequency.
  • the efficiency of FRET method can be estimated form computational models. See, e.g., Furey et al., 1998; Clegg et al., 1993; Mathies et al., 1990.
  • the efficiency of energy transfer (E) is computed from the equation (1):
  • R 0 is calculated from equation (2):
  • ⁇ 2 is a geometric orientation factor related to the relative angle of the two transition dipoles ( ⁇ 2 is generally assumed to be 2 ⁇ 3)
  • J DA [M ⁇ 1 cm 3 ] is the overlap integral representing the normalized spectral overlap of the donor emission and acceptor absorption
  • Q D is the quantum yield.
  • the overlap integral is computed from equation (3):
  • I D and I RF are the fluorescence intensities of donor and a reference compound (fluorescein in 0.1 N NaOH), and A RF and A D are the absorbances of the reference compound and donor.
  • Q RF is the quantum yield of fluorescein in 0.1N NaOH and is taken to be 0.90.
  • R the distance between the donor and acceptor
  • R is measured by looking at different configurations (e.g., conformations) of the polymerase in order to obtain a conformationally averaged value. If both tags are on the polymerase, then R is the distance between the donor and acceptor in the open and closed conformation, while if the donor is on the polymerase and the acceptor on the dNTP, R is the distance between the donor and acceptor when the dNTP is bound to the polymerase and the polymerase is its closed form.
  • configurations e.g., conformations
  • Dye sets are chosen to maximize energy transfer efficiency between a tagged dNTP and a tag on the polymerase when the polymerase is in its closed configuration and to minimize energy transfer efficiency between the tag on the DNTP (either non-productively bound or in solution) and the tag on the polymerase when the polymerase is in its open configuration.
  • a molarity of each nucleotide in the reaction medium of no more than about 1 ⁇ M
  • an average distance between tagged nucleotides is calculated to be greater than or equal to about 250 ⁇ . Because this distance is several fold larger than the distance separating sites on the polymerase in its open to closed conformational, minimal FRET background between the polymerase and free dNTPs is observed.
  • nucleotide concentrations are reduced below 1 ⁇ M.
  • Reducing dNTP concentrations to levels of at least ⁇ 10% of the K m further minimizes background fluorescence and provides a convenient method for controlling the rate of the polymerase reaction for the real-time monitoring. Under such conditions, the velocity of the polymerization reaction is linearly proportional to the dNTP concentration and, thus, highly sensitive to regulation.
  • the use of a single excitation wavelength allows improved identification of unique tags on each DNTP. A single, lower-wavelength excitation laser is used to achieve high selectivity.
  • a fluorescence donor is attached to a site on the polymerase comprising a replaced amino acid more amenable to donor attachment such as cysteine and four unique fluorescence acceptors are attached to each dNTP.
  • fluorescein is attached to a site on the polymerase and rhodamine, rhodamine derivatives and/or fluorescein derivatives are attached to each dNTP.
  • Each donor-acceptor fluorophore pair is designed to have an absorption spectra sufficiently distinct from the other pairs to allow separate identification after excitation.
  • the donor is selected such that the excitation light activates the donor, which then efficiency transfers the excitation energy to one of the acceptors.
  • the acceptor After energy transfer, the acceptor emits it unique fluorescence signature.
  • the emission of the fluorescence donor must significant overlap with the absorption spectra of the fluorescence acceptors for efficient energy transfer.
  • the methods of this invention can also be performed using two, three or four unique fluorescence donor-acceptor pairs, by running parallel reactions.
  • Fluorophore choice is a function of not only its enzyme compatibility, but also its spectral and photophysical properties. For instance, it is critical that the acceptor fluorophore does not have any significant absorption at the excitation wavelength of the donor fluorophore, and less critical (but also desirable) is that the donor fluorophore does not have emission at the detection wavelength of the acceptor fluorophore. These spectral properties can be attenuated by chemical modifications of the fluorophore ring systems.
  • the dNTPs are amenable to tagging at several sites including the base, the sugar and the phosphate groups, the dNTPs are preferably tagged at either the ⁇ and/or ⁇ phosphate. Tagging the terminal phosphates of dNTP has a unique advantage. When the incoming, tagged dNTP is bound to the active site of the polymerase, significant FRET from the donor on the polymerase to the acceptor on the dNTP occurs. The unique fluorescence of the acceptor identifies which dNTP is incorporated.
  • the fluorescence acceptor which is now attached to the pyrophosphate group, is released to the medium with the cleaved pyrophosphate group.
  • the growing DNA chain includes no fluorescence acceptor molecules at all.
  • FRET occurs only between the donor on the polymerase and incoming acceptor-labeled dNTP, one at a time. This approach is better than the alternative attachment of the acceptor to a site within the dNMP moiety of the dNTP or the use of multiply-modified dNTPs. If the acceptor is attached to a site other than the ⁇ or ⁇ phosphate group, it becomes part of the growing DNA chain and the DNA chain will contain multiple fluorescence acceptors. Interference with the polymerization reaction and FRET measurements would likely occur.
  • collisional quenchers can be added to the polymerizing medium that do not covalently interact with the acceptors on the dNTPs and quench fluorescence from the tagged dNTPs in the medium.
  • the quenchers are also adapted to have insignificant contact with the donor on the polymerase.
  • the polymerase tag is preferably localized internally and shielded from the collisional quenchers or the collisional quencher can be made sterically bulky or associate with a sterically bulky group to decrease interaction between the quencher and the polymerase.
  • Another preferred method for detecting polymerase-nucleotide interactions involves using nucleotide-specific quenching agents to quench the emission of a fluorescent tag on the polymerase.
  • the polymerase is tagged with a fluorophore, while each dNTP is labeled with a quencher for the fluorophore.
  • DABCYL 4-(4′-dimethylaminophenylazo) benzoic acid is a universal quencher, which absorbs energy from a fluorophore, such as 5-(2′-aminoethyl) aminonaphthalene-1-sulfonic acid (AEANS) and dissipates heat.
  • AEANS 5-(2′-aminoethyl) aminonaphthalene-1-sulfonic acid
  • a quencher is selected for each dNTP so that when each quencher is brought into close proximity to the fluorophore, a distinguishable quenching efficiency is obtained. Therefore, the degree of quenching is used to identify each dNTP as it is being incorporated into the growing DNA chain.
  • One advantage of this preferred detection method is that fluorescence emission comes from a single source rendering background noise negligible.
  • two or three suitable quenchers are identified, then two or three of the four dNTPs are labeled and a series of polymerization reaction are made each time with a different pair of the labeled dNTPs. Combining the results from these runs, generates a complete sequence of the DNA molecule.
  • the present invention is directed to attaching any type of atomic and/or molecular tag that has a detectable property
  • the processes for site selection and tag attachment are illustrated using a preferred class of tags, namely fluorescent tags.
  • the fluorescence probes or quenchers attached to the polymerase or dNTPs are designed to minimize adverse effects on the DNA polymerization reaction.
  • the inventors have developed synthetic methods for chemically tagging the polymerase and dNTPs with fluorescence probes or quenchers.
  • the polymerase is tagged by replacing a selected amino acid codon in the DNA sequence encoding the polymerase with a codon for an amino acid that more easily reacts with a molecular tag such as cysteine via mutagenesis.
  • a molecular tag such as cysteine via mutagenesis.
  • the mutant is inserted into E. coli for expression.
  • the mutant polymerase is isolated and purified.
  • the purified mutant polymerase is then tested for polymerase activity.
  • the mutant polymerase is reacted with a slight molar excess of a desired tag to achieve near stoichiometric labeling.
  • the polymerase can be treated with an excess amount of the tag and labeling followed as a function of time. The tagging reaction is than stopped when near stoichiometric labeling is obtained.
  • the mutant polymerase includes several sites including the target residue that can undergo tagging with the desired molecular tag
  • the tagging reaction can also be carried out under special reaction conditions such as using a protecting group or competitive inhibitor and a reversible blocking group, which are later removed.
  • a protecting group or competitive inhibitor is first added to protect the target residue and a reversible blocking group is subsequently added to inactivate non-target residues.
  • the protecting group or competitive inhibitor is then removed from the target residue, and the mutant polymerase is treated with the desired tag to label the target residue.
  • the blocking groups are chemically removed from non-target residues in the mutant polymerase and removed to obtain a tagged mutant polymerase with the tag substantially to completely isolated on the target residue.
  • the polymerase can be treated with a blocking group to inactivate non-target residues. After removal of unreacted blocking group, the mutant polymerase is treated with the desired tag for labeling the target residue. Finally, the blocking groups are chemically removed from the non-target residues in the mutant polymerase and removed to obtain the tagged mutant polymerase.
  • the inventors have identified amino acids in the Taq polymerase that are likely to withstand mutation and subsequent tag attachment such as the attachment of a fluorescent tag. While many sites are capable of cysteine replacement and tag attachment, preferred sites in the polymerase were identified using the following criteria: (1) they are not in contact with other proteins; (2) they do not alter the conformation or folding of the polymerase; and (3) they are not involved in the function of the protein. The selections were accomplished using a combination of mutational studies including sequence analyses data, computational studies including molecular docking data and assaying for polymerase activity and fidelity. After site mutation, computational studies will be used to refine the molecular models and help to identify other potential sites for mutation.
  • Regions of the protein surface that are not important for function were identified, indirectly, by investigating the variation in sequence as a function of evolutionary time and protein function using the evolutionary trace method. See, e.g., Lichtarge et al., 1996. In this approach, amino acid residues that are important for structure or function are found by comparing evolutionary mutations and structural homologies.
  • the polymerases are ideal systems for this type of study, as there are many crystal and co-crystal structures and many available sequences. The inventors have excluded regions of structural/functional importance from sites selection for mutation/labeling.
  • visual inspection and overlays of available crystal structures of the polymerase in different conformational states provided further assistance in identifying amino acid sites near the binding site for dNTPs.
  • Some of the chosen amino acids sites are somewhat internally located and preferably surround active regions in the polymerase that undergo changes during base incorporation, such as the dNTP binding regions, base incorporation regions, pyrophosphate release regions, etc. These internal sites are preferred because a tag on these sites show reduced background signals during detection, i.e., reduce interaction between the polymerase enzyme and non-specifically associated tagged dNTPs, when fluorescently tagged dNTPs are used.
  • Another aspect of this invention involves the construction of molecular mechanics force field parameters for atomic and/or molecular tags such as fluorescent tags used to tag the dNTPs and the polymerase and parameters for the fluorescent tagged amino acid on the polymerase and/or dNTP.
  • Force field parameters are using quantum mechanical studies to obtain partial charge distributions and energies for relevant intramolecular conformations (i.e., for the dihedral angle definitions) derived from known polymerase crystal structures.
  • Ionization states of each ionizable residue are estimated using an electrostatic model in which the protein is treated as a low dielectric region and the solvent as a high dielectric, using the UHBD program. See, e.g., Antosiewicz et al., 1994; Briggs and Antosiewicz, 1999; Madura et al., 1995.
  • the electrostatic free energies of ionization of each ionizable residue are computed by solving the Poisson-Boltzmann equation for each residue. These individual ionization free energies are modified to take into account coupled titration behavior resulting in a set of self-consistent predicted ionization states.
  • an electrostatic potential map is generated from properties of the molecular surface of the Taq polymerase/DNA complex, screened by solvent and, optionally, by dissolved ions (i.e., ionic strength) using mainly the UHBD program.
  • the map provides guidance about binding locations for the dNTPs and the electrostatic environment at proposed mutation/labeling sites.
  • the molecular models generated are designed to be continually refined taking into account new experimental data, allowing the construction of improved molecular models, improved molecular dynamics calculations and improved force field parameters so that the models better predict system behavior for refining tag chemistry and/or tag positioning, predicting new polymerase mutants, base incorporation rates and polymerase fidelity.
  • Co-crystal structures solved for DNA polymerase I (DNA pol I) from E. coli, T. aquaticus, B. stearothermophilus , T7 bacteriophage, and human pol ⁇ demonstrate that (replicative) polymerases share mechanistic and structural features.
  • the structures that capture Taq DNA polymerase in an ‘open’ (non-productive) conformation and in a ‘closed’ (productive) conformation are of particular importance for identifying regions of the polymerase that undergo changes during base incorporation.
  • the addition of the nucleotide to the polymerase/primer/template complex is responsible for the transition from its open to its closed conformation.
  • the open and closed ternary complex forms of the large fragment of Taq DNA pol I (Klentaq 1) are shown in a superimposition of their C ⁇ tracings.
  • the ternary complex contains the enzyme, the ddCTP and the primer/template duplex DNA.
  • the open structure is shown in magenta and the closed structure is shown in yellow.
  • the disorganized appearance in the upper left portion of the protein shows movement of the ‘fingers’ domain in open and closed conformations.
  • amino acids represent preferred amino acid sites for cysteine replacement and subsequent tag attachment, because these sites represent the sites in the Taq polymerase the undergo significant changes in position during base incorporation.
  • amino acid site selection visualization of the polymerase in its open and closed conformational extremes for these identified amino acid sites is used so that the final selected amino acid sites maximize signal and minimize background noise, when modified to carry fluorescent tags for analysis using the FRET methodology.
  • Amino acid changes that are not predicted to significantly affect the protein's secondary structure or activity make up a refined set of amino acid sites in the Taq polymerase for mutagenesis and fluorescent modification so that the tag is shielded from interaction with free dNTPs.
  • the following three panels illustrate the protocol used in this invention to refine amino acid site selection from the about list of amino acids that undergo the largest change in position relative to a bound ddGTP as the polymerase transitions from the open to the closed form.
  • FIGS. 3 A-C an overlay between 3 ktq (closed ‘black’) and 1 tau (open ‘light blue’), the large fragment of Taq DNA polymerase I is shown.
  • the bound DNA from 3 ktq is shown in red while the ddCTP bound to 3 ktq is in green.
  • Three residues were visually identified as moving the most when the polymerase goes from open (1 tau) to closed (3 ktq), namely, Asp655, Pro656, and Leu657. Based on further analyses of the structures, Pro656 appears to have the role of capping the O-helix. Leu657's side chain is very close to another part of the protein in the closed (3 ktq) form.
  • FIG. 3B a close-up view of the active site from the overlay of the 3 ktq (closed) and 1 tau (open) conformations of Taq polymerase is shown. The large displacements between the open and closed conformations are evident.
  • FIG. 3C a close-up view of a molecular surface representation of 3 ktq (in the absence of DNA and ddCTP). The molecular surface is colored in two areas, blue for Asp655 and green for Leu657.
  • Leu657 is in close proximity to another part of the protein, because the green part of the molecular surface, in the thumb domain, is “connected” to a part of the fingers domain.
  • This view shows this region of the polymerase looking into the palm of the hand with fingers to the right and thumb to the left.
  • the gene encoding Taq DNA polymerase was obtained and will be expressed in pTTQ 18 in E. coli strain DH1. See, e.g., Engelke et al., 1990.
  • the inventors have identified candidate amino acids for mutagenesis including the amino acids in Tables I-IV, the refined lists or mixtures or combinations thereof.
  • the inventors using standard molecular methods well-known in the art introduced a cysteine codon, individually, at each of target amino acid sites. See, e.g., Sambrook et al., 1989 and Allen et al., 1998.
  • DNA is purified from isolated colonies expressing the mutant polymerase, sequenced using dye-terminator fluorescent chemistry, detected on an ABI PRISM 377 Automated Sequencer, and analyzed using SequencherTM available from GeneCodes, Inc.
  • the inventors have demonstrated that the Taq polymerase is capable of incorporating ⁇ -tagged dNTPs to synthesize extended DNA sequences.
  • the next step involves the construction of mutants capable of carrying a tag designed to interact with the tags on the dNTPS and optimization of the polymerase for single-molecule sequencing.
  • the mutants are constructed using standard site specific mutagenesis as described above and in the experimental section.
  • the constructs are then inserted into and expressed in E. coli .
  • Mutant Taq polymerase is then obtained after sufficient E. coli is grown for subsequence polymerase isolation and purification.
  • E. coli can be grown to optical densities exceeding 100 by computer-controlled feedback-based supply of non-fermentation substrates, the resulting three kg of E. coli cell paste will be excessive during polymerase optimization.
  • optimized polymerases construct are prepared, then this large scale production will be used.
  • the mutants are derived from E. coli cell masses grown in 10 L well-oxygenated batch cultures using a rich medium available from Amgen.
  • the mutants are prepared by growing E. coli in 2 L baffled shake glasses. Cell paste are then harvested using a 6 L preparative centrifuge, lysed by French press, and cleared of cell debris by centrifugation. To reduce interference from E.
  • nucleic acid sequences it is preferably to also remove other nucleic acids. Removal is achieved using either nucleases (and subsequent heat denaturation of the nuclease) or, preferably using a variation of the compaction agent-based nucleic acid precipitation protocol as described in Murphy et al., Nature Biotechnology 17, 822, 1999.
  • a single anion-exchange step typically on Q Sepharose at pH 8.0, is generally sufficient to produce a product pure enough to these tests.
  • a second purification step will also be performed to insure that contamination does not cloud the results of subsequent testing.
  • the second purification step involves SDS-PAGE and CD-monitored melting experiments.
  • the dNTPs are tagged either by reacting a dNTP with a desired tag or by reacting a precursor such as the pyrophosphate group or the base with a desired tag and then completing the synthesis of the dNTP.
  • the inventors have developed syntheses for modifying fluorophore and fluorescence energy transfer compounds to have distinct optical properties for differential signal detection, for nucleotide/nucleoside synthons for incorporation of modifications on base, sugar or phosphate backbone positions, and for producing complementary sets of four deoxynucleotide triphosphates (dNTPs) containing substituents on nucleobases, sugar or phosphate backbone.
  • dNTPs deoxynucleotide triphosphates
  • the native Taq polymerase is capable of polymerizing phosphate-modified dNTPs or ddNTPs. Again, tagging the dNPTs or ddNTPs at the beta and/or gamma phosphate groups is a preferred because the replicated DNA contains no unnatural bases, polymerase activity is not significantly adversely affected and long DNA strands are produced.
  • the inventors have synthesized ⁇ -ANS-phosphate dNTPs, where the ANS is attached to the phosphate through a phosphamide bond. Although these tagged dNTPs are readily incorporated by the native Taq polymerase and by HIV reverse transcriptase, ANS is only one of a wide range of tags that can be attached through either the ⁇ and/or ⁇ phosphate groups.
  • the present invention uses tagged dNTPs or ddNTPs in combination with polymerase for signal detection.
  • the dNTPs are modified at phosphate positions (alpha, beta and/or gamma) and/or other positions of nucleotides through a covalent bond or affinity association.
  • the tags are designed to be removed from the base before the next monomer is added to the sequence.
  • One method for removing the tag is to place the tag on the gamma and/or beta phosphates.
  • the tag is removed as pyrrophosphate dissociates from the growing DNA sequence.
  • Another method is to attach the tag to a position of on the monomer through a cleavable bond.
  • the tag is then removed after incorporation and before the next monomer incorporation cleaving the cleavable bond using light, a chemical bond cleaving reagent in the polymerization medium, and/or heat.
  • FR is a fluorescent tag
  • L is a linker group
  • X is either H or a counterioin depending on the pH of the reaction medium
  • Z is a group capable of reaction with the hydroxyl group of the pyrophosphate and Z′ is group after reaction with the dNMP.
  • Z is Cl, Br, I, OH, SH, NH 2 , NHR, CO 2 H, CO 2 R, SiOH, SiOR, GeOH, GeOR, or similar reactive functional groups, where R is an alkyl, aryl, aralkyl, alkaryl, halogenated analogs thereof or hetero atom analogs thereof and Z′ is O, NH, NR, CO 2 , SiO, GeO, where R is an alkyl, aryl, aralkyl, alkaryl, halogenated analogs thereof or hetero atom analogs thereof .
  • the synthesis involves reacting Z terminated fluorescent tag, FR-L-Z with a pyrophosphate group, P 2 O 6 X 3 H, in DCC and dichloromethane to produce a fluorescent tagged pyrophosphate.
  • a fluorescent tagged pyrophosphate is prepared, it is reacted with a morpholine terminated dNMP in acidic THF to produce a dNTP having a fluorescent tag on its ⁇ -phosphate. Because the final reaction bears a fluorescent tag and is larger than starting materials, separation from unmodified starting material and tagged pyrophosphate is straight forward.
  • Fluorescein (FR) is first reacted with isobutyryl anhydride in pyridine in the presence of diisopropyl amine to produce a fluorescein having both ring hydroxy groups protected for subsequent linker attachment.
  • the hydroxy protected fluorescein is then reacted with N-hydroxylsuccinimide in DCC and dichloromethane to produce followed by the addition of 1-hydroxy-6-amino hexane to produce an hydroxy terminated FR-L group.
  • This group can then be reacted either with pyrophosphate to tag the dNTPs at their ⁇ -phosphate group or to tag amino acids. See, e.g., Ward et al., 1987; Engelhardt et al., 1993; Little et al., 2000; Hobbs, 1991.
  • tags can be designed so that each tag emits a distinguishable emission spectra.
  • the emission spectra can be distinguished by producing tags with non-overlapping emission frequencies—multicolor—or each tag can have a non-overlapping spectral feature such a unique emission band, a unique absorption band and/or a unique intensity feature.
  • System that use a distinguishable tag on each dNTP improves confidence values associated with the base calling algorithm.
  • fluorescein is adaptable to other dyes as well such as tetrachlorofluorescein (JOE) or N,N,N′,N′-tetramethyl-6-carboxyrhodamine (TAMRA).
  • JE tetrachlorofluorescein
  • TAMRA N,N,N′,N′-tetramethyl-6-carboxyrhodamine
  • the gamma phosphate tagged reactions are carried out in basic aqueous solutions and a carbodiimide, such as DEC.
  • DEC carbodiimide
  • Other fluorophore molecules and dNTPs can be similarly modified.
  • the dNTPs can also be tagged on the base and/or sugar moieties while maintaining their polymerase reaction activity.
  • the sites for modifications are preferably selected to not interfere with Watson-Crick base pairing.
  • a generalized scheme for base modification is shown below:
  • polymerase variants The activities of polymerase variants are monitored throughout polymerase development. Polymerase activity is assayed after a candidate amino acid is mutated to cysteine and after fluorescent tagging of the cysteine.
  • the assay used to monitor the ability of the native Taq polymerase to incorporate fluorescently-tagged dNTPs is also used to screen polymerase variants. Since the mutant Taq polymerases have altered amino acid sequences, the assays provide mutant characterization data such as thermostability, fidelity, polymerization rate, affinity for modified versus natural bases.
  • Mutant Taq polymerase activity assays are carried out under conditions similar to those used to examine the incorporation of fluorescently-tagged dNTPs into DNA polymers by the native Taq polymerase.
  • the purified mutant Taq polymerase is incubated in polymerase reaction buffer with a 5′- 32 P end-labeled primer/single-stranded template duplex, and appropriate tagged dNTP(s).
  • the polymerase's ability to incorporate a fluorescently-tagged dNTP is monitored by assaying the relative amount of fluorescence associated with the extended primer on either an AB1377 DNA Sequencer (for fluorescently tagged bases), a Fuji BAS1000 phosphorimaging system, or other appropriate or similar detectors or detection systems. This assay is used to confirm that the mutant polymerase incorporates tagged DNT ⁇ and to confirm that fluorescent signatures are obtained during base incorporation. These assays use an end-labeled primer, the fluorescently-tagged dNT ⁇ and the appropriate base beyond the fluorescent tag. The products are then size separated and analyzed for extension. Reactions are either performed under constant temperature reaction conditions or thermocycled, as necessary.
  • Taq DNA polymerase to incorporate a ⁇ -phosphate dNTP variant is assayed using conditions similar to those developed to examine single base incorporation by a fluorescently-tagged DNA polymerase. See, e.g. Furey et al., 1998. These experiments demonstrate that polymerases bearing a fluorescent tag do not a priori have reduced polymerization activity. The inventors have demonstrated that the native Taq polymerase incorporates ⁇ -tagged dNTP, singly or collectively to produce long DNA chains.
  • polymerase reaction buffer such as Taq DNA polymerase buffer available from Promega Corporation of Madison, Wisconsin with either a 5′- 32 P or a fluorescently end-labeled primer (TOP)/single-stranded template (BOT-‘X’) duplex, and appropriate dNTP(s) as shown in Table V. Reactions are carried out either at constant temperature or thermocycled, as desired or as is necessary. Reaction products are then size-separated and quantified using a phosphorimaging or fluorescent detection system. The relative efficiency of incorporation for each tagged dNTP is determined by comparison with its natural counterpart.
  • polymerase reaction buffer such as Taq DNA polymerase buffer available from Promega Corporation of Madison, Wisconsin with either a 5′- 32 P or a fluorescently end-labeled primer (TOP)/single-stranded template (BOT-‘X’) duplex, and appropriate dNTP(s) as shown in Table V. Reactions are carried out either at constant temperature or thermocycled,
  • ‘TOP’ represents the primer strand of an assay DNA duplex. Variants of the template strand are represented by ‘BOT’. The relevant feature of the DNA template is indicated after the hyphen.
  • BOT-T, BOT-C, BOT-G, BOT-A are used to monitor polymerase incorporation efficiency and fidelity for either nucleotides or nucleotide variants of dA, dG, dC, and dT, respectively.
  • Preliminary assays are performed prior to exhaustive purification of the tagged dNTP to ensure that the polymerase is not inhibited by a chemical that co-purifies with the tagged dNTP, using the ‘BOT-Sau’ template.
  • the ‘BOT-Sau’ template was designed to monitor incorporation of natural dGTP prior to tagged dATP (i.e., a positive control for polymerase activity). More extensive purification is then performed for promising tagged nucleotides.
  • experiments are carried out to determine whether the polymerase continues extension following incorporation of the tagged dNTPs, individually or collectively, using the same end-labeled ‘TOP’ primer, the appropriate ‘BOT’ primer, the fluorescently-tagged dNTP, and the appropriate base 3′ of the tagged nucleotide.
  • the products are then size-separated and analyzed to determine the relative extension efficiency.
  • the Taq DNA polymerase lacks 3′ to 5′ exonuclease activity (proofreading activity). If the polymerase used in single-molecule DNA sequencing possessed a 3′ to 5′ exonuclease activity, the polymerase would be capable of adding another base to replace one that would be removed by the proofreading activity. This newly added base would produce a signature fluorescent signal evidencing the incorporation of an additional base in the template, resulting in a misidentified DNA sequence, a situation that would render the single-molecule sequencing systems of this invention problematic.
  • the sequencing reactions are preferably run in parallel, with the optimal number required to produce sequence information with a high degree of confidence for each base call determined by the error rate. Larger error rates require more parallel run, while smaller error rates require fewer parallel runs. In fact, if the error rate is low enough, generally less than 1 error in 1,000, preferably 1 error in 5,000 and particularly 1 error in 10,000 incorporated base, then no parallel runs are required. Insertions or deletions are, potentially, more serious types of errors and warrant a minimal redundancy of 3 repeats per sample. If 2 reactions were run, one could not be certain which was correct. Thus, 3 reactions are needed for the high quality data produced by this system.
  • the BOT-variant templates are used to characterize the accuracy at which each ⁇ -tagged dNTP is incorporated by an engineered polymerase as set forth in Table V. Oligonucleotides serve as DNA templates, and each differing only in the identity of the first base incorporated. Experiments using these templates are used to examine the relative incorporation efficiency of each base and the ability of the polymerase to discriminate between the tagged dNTPs. Initially, experiments with polymerase variants are carried out using relatively simple-sequence, single-stranded DNA templates. A wide array of sequence-characterized templates is available from the University of Houston in Dr. Hardin's laboratory, including a resource of over 300 purified templates. For example, one series of templates contains variable length polyA or polyT sequences. Additional defined-sequence templates are constructed as necessary, facilitating the development of the base-calling algorithms.
  • SPEX 212 instrument Direct detection of polymerase action on the tagged dNTP is obtained by solution fluorescence measurements, using SPEX 212 instrument or similar instrument. This instrument was used to successfully detect fluorescent signals from ANS tagged ⁇ -phosphate dNTPs, being incorporated by Taq polymerase at nanomolar concentration levels.
  • the SPEX 212 instrument includes a 450 watt xenon arc source, dual emission and dual excitation monochromators, cooled PMT (recently upgraded to simultaneous T-format anisotropy data collection), and a Hi-Tech stopped-flow accessory.
  • This instrument is capable of detecting an increase in fluorescence intensity and/or change in absorption spectra upon liberation of the tagged pyrophosphate from ANS tagged ⁇ -phosphate dNTPs, as was verified for ANS-pyrophosphate released by Taq and RNA polymerase and venom phosphodiesterase.
  • the detection of fluorescence from single molecules is preferably carried out using microscopy. Confocal-scanning microscopy can be used in this application, but a non-scanning approach is preferred.
  • An microscope useful for detecting fluorescent signals due to polymerase activity include any type of microscope, with oil-immersion type microscopes being preferred.
  • the microscopes are preferably located in an environment in which vibration and temperature variations are controlled, and fitted with a highly-sensitive digital camera. While many different cameras can be to record the fluorescent signals, the preferred cameras are intensified CCD type cameras such as the iPentaMax from Princeton Instruments.
  • the method of detection involves illuminating the samples at wavelengths sufficient to induce fluorescence of the tags, preferably in an internal-reflection format. If the fluorescent tags are a donor-acceptor pair, then the excitation frequency must be sufficient to excite the donor.
  • the preferred light source is a laser. It will often be advantageous to image the same sample in multiple fluorescence emission wavelengths, either in rapid succession or simultaneously. For simultaneous multi-color imaging, an image splitter is preferred to allow the same CCD to collect all of the color images simultaneously. Alternatively, multiple cameras can be used, each viewing the sample through emission optical filters of different wavelength specificity.
  • Tag detection in practice depends upon many variables including the specific tag used as well electrical, fluorescent, chemical, physical, electrochemical, mass isotope, or other properties.
  • Single-molecule fluorescence imaging is obtainable employing a research-grade Nikon Diaphot TMD inverted epifluorescence microscope, upgraded with laser illumination and a more-sensitive camera.
  • single-molecule technology is a well-developed and commercially available technology.
  • the epifluorescence microscope can be retrofitted for evanescent-wave excitation using an argon ion laser at 488 nm.
  • the inventors have previously used this illumination geometry in assays for nucleic acid hybridization studies.
  • the existing setup has also been upgraded by replacement of the current CCD camera with a 12-bit 512 ⁇ 512 pixel Princeton Instruments I-PentaMAX generation IV intensified CCD camera, which has been used successfully in a variety of similar single-molecule applications. This camera achieves a quantum efficiency of over 45% in the entire range of emission wavelengths of the dyes to be used, and considerably beyond this range.
  • the vertical alignment of their existing microscope tends to minimize vibration problems, and the instrument is currently mounted on an anti-vibration table.
  • a preferred high-sensitivity imaging system is based on an Olympus IX70-S8F inverted epifluorescence microscope.
  • the system incorporates low-background components and enables capture of single molecule fluorescence images at rates of greater than 80 frames per second with quantum efficiency between 60-70% in the range of emission wavelengths of the fluorescently active tags.
  • a data collection channel such as a single pixel or pixel-bin of the viewing field of the CCD or other digital imaging system.
  • a finite number of data collection channels such as pixels are available in any given digital imaging apparatus. Randomly-spaced, densely-positioned fluorescent emitters generally produce an increased fraction of pixels or pixel bins that are multiply-occupied and problematic in data analysis. As the density of emitters in the viewing field increases so does the number of problematic data channels. While multiple occupancy of distinguishable data collection regions within the viewing field can be reduced by reducing the concentration of emitters in the viewing field, this decrease in concentration of emitters increases the fraction of data collection channels or pixels that see no emitter at all, therefore, leading to inefficient data collection.
  • a preferred method for increasing and/or maximizing the data collection efficiency involves controlling the spacing between emitters (tagged polymerase molecules). This spacing is achieved in a number of ways.
  • the polymerases can be immobilized on a substrate so that only a single polymerase is localized within each data collection channel or pixel region within the viewing field of the imaging system.
  • the immobilization is accomplished by anchoring a capture agent or linking group chemically attached to the substrate.
  • Capture or linking agents can be spaced to useful distances by choosing inherently large capture agents, by conjugating them with or bonding them to molecules which enhance their steric bulk or electrostatic repulsion bulk, or by immobilizing under conditions chosen to maximize repulsion between polymerizing molecular assembly (e.g., low ionic strength to maximize electrostatic repulsion).
  • the polymerase can be associated with associated proteins that increase the steric bulk of the polymerase or the electrostatic repulsion bulk of the polymerizing system so that each polymerizing molecular assembly cannot approach any closer than a distance greater than the data channel resolution size of the imaging system.
  • assays are performed essentially as described in for polymerase activity assays described herein.
  • the primary difference between assaying polymerase activity for screening purposes involves the immobilization of some part of the polymerizing assembly such as the polymerase, target DNA or a primer associated protein to a solid support to enable viewing of individual replication events.
  • immobilization options are available, including, without limitation, covalent and/or non-covalent attachment of one of the molecular assemblies on a surface such as an organic surface, an inorganic surface, in or on a nanotubes or other similar nano-structures and/or in or on porous matrices.
  • a preferred data collection method for single-molecule sequencing is to ensure that the fluorescently tagged polymerases are spaced apart within the viewing field of the imagining apparatus so that each data collection channel sees the activity of only a single polymerase.
  • the raw data generated by the detector represents between one to four time-dependent fluorescence data streams comprising wavelengths and intensities: one data stream for each fluorescently labeled base being monitored. Assignment of base identities and reliabilities are calculated using the PHRED computer program. If needed, the inventors will write computer programs to interpret the data streams having partial and overlapping data. In such cases, multiple experiments are run so that confidence limits are assigned to each base identity according to the variation in the reliability indices and the difficulties associated with assembling stretches of sequence from fragments. The reliability indices represent the goodness of the fit between the observed wavelengths and intensities of fluorescence compared with ideal values. The result of the signal analyses is a linear DNA sequence with associated probabilities of certainty.
  • the data is stored in a database for dynamic querying for identification and comparison purposes.
  • a search term sequence of 6-10, 11-16, 17-20, 21-30 bases can be compared against reference sequences to quickly identify perfectly matched sequences or those sharing a user defined level of identity.
  • Multiple experiments are run so that confidence limits can be assigned to each base identity according to the variation in the reliability indices and the difficulties associated with assembling stretches of sequence from fragments.
  • the reliability indices represent the goodness of the fit between the observed wavelengths and intensities of fluorescence compared with the ideal values.
  • the result of the signal analyses is a linear DNA sequence with associated probabilities of certainty.
  • Data collection allows data to be assembled from partial information to obtain sequence information from multiple polymerase molecules in order to determine the overall sequence of the template or target molecule.
  • An important driving force for convolving together results obtained with multiple single-molecules is the impossibility of obtaining data from a single molecule over an indefinite period of time.
  • a typical dye photobleaching efficiency of 2*10 ⁇ 5 a typical dye molecule is expected to undergo 50,000 excitation/emission cycles before permanent photobleaching.
  • Data collection from a given molecule may also be interrupted by intersystem crossing to an optically inactive (on the time scales of interest) triplet state. Even with precautions against photobleaching, therefore, data obtained from any given molecule is necessarily fragmentary for template sequences of substantial length, and these subsequences are co-processed in order to derive the overall sequence of a target DNA molecule.
  • Taq pol I Bacteriophage lambda host strain Charon 35 harboring the full-length of the Thermus aquaticus gene encoding DNA polymerase I (Taq pol I) was obtained from the American Type Culture Collection (ATCC; Manassas, Va.). Taq pol I was amplified directly from the lysate of the infected E. coli host using the following DNA oligonucleotide primers:
  • each synthetic DNA oligonucleotide represents engineered EcoRI restriction sites immediately preceding and following the Taq pol I gene.
  • PCR amplification using the reverse primer described above and the following forward primer created an additional construct with an N-terminal deletion of the gene:
  • the underlined segment corresponds to an engineered NcoI restriction site with the first codon encoding for an alanine (ATG start representing an expression vector following the ribosome binding site).
  • ATG start representing an expression vector following the ribosome binding site.
  • the full-length and truncated constructs of the Taq pol I gene is ligated to a single EcoRI site (full-length) and in an Ncoo/EcoRI digested pRSET-b expression vector.
  • E. coli strain JM109 is used as host for all in vivo manipulation of the engineered vectors.
  • Overlapping primers are used to introduce point mutations into the native gene by PCR based mutagenesis (using Pfu DNA polymerase).
  • Complementary forward and reverse primers each contain a codon that encodes the desired mutated amino acid residue.
  • PCR using these primers results in a knicked, non-methylated, double-stranded plasmid containing the desired mutation.
  • DpnI restriction enzyme cuts at methylated guanosines in the sequence GATC.
  • the resulting mutant Taq polymerases are then reacted with a desired atomic or molecular tag to tag the cysteine in the mutant structure through the SH group of the cysteine residue and screened for native and/or tagged dNTP incorporation and incorporation efficiency.
  • the mutant polymerases are also screened for fluorescent activity during base incorporation.
  • the present invention also relates to mutant Taq polymerase having a cysteine residue added one or more of the sites selected from the group consisting of 513-518, 643, 647, 649 and 653-661. After cysteine replacement and verification of polymerase activity using the modified dNTPs, the mutant Taq polymerases are reacted with a tag through the SH group of the inserted cysteine residue.
  • This example illustrates the preparation of gamma ANS tagged dATP, shown graphically in FIG. 4.
  • reaction was diluted to 50 mL and adjusted to a solution of 0.05 M triethylammonium bicarbonate buffer (TEAB, pH ⁇ 7.5).
  • TEAB triethylammonium bicarbonate buffer
  • the reaction product was chromatographed on a 50 mL DEAE-SEPHADEX ion exchanger (A-25-120) column at low temperature that was equilibrated with ⁇ pH 7.5 1.0 M aqueous TEAB (100 mL), 1.0 M aqueous sodiumbicarbonate (1100 mL), and ⁇ pH 7.5, 0.05 Maqueous TEAB (100 mL).
  • the column was eluted with a linear gradient of ⁇ pH 7.5 aqueous TEAB from 0.05 to 0.9 M.
  • Lane 1 contains 5′ radiolabeled ‘TOP’ probe in extension buffer.
  • Lane 2 contains Taq DNA polymerase, 50 ⁇ M dGTP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-Sau’).
  • Lane 3 contains Taq DNA polymerase, 50 ⁇ M dATP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-Sau’).
  • Lane 4 contains Taq DNA polymerase, 50 ⁇ M ANS- ⁇ -dATP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-Sau’).
  • Lane 5 contains Taq DNA polymerase, 50 ⁇ M dGTP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-T’).
  • Lane 6 contains spill-over from lane 5.
  • Lane 7 contains Taq DNA polymerase, 50 ⁇ M dATP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-T’).
  • Lane 8 contains Taq DNA polymerase, 50 ⁇ M ANS- ⁇ -dATP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-T’).
  • Lane 9 contains Taq DNA polymerase, 50 ⁇ M dGTP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-3T’).
  • Lane 10 contains Taq DNA polymerase, 50 ⁇ M dATP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-3T’).
  • Lane 11 contains Taq DNA polymerase, ANS- ⁇ -dATP incubated with a DNA duplex (radiolabeled TOP with excess ‘BOT-3T’).
  • Lane 12 contains 5′ radiolabeled ‘TOP’ probe in extension buffer.
  • Lane 13 contains 5′ radiolabeled ‘TOP’ probe and Taq DNA polymerase in extension buffer. Oligonucleotide sequences are shown in Table V.
  • This next example illustrates the synthesis of extended DNA polymers using all four ANS tagged ⁇ -phosphate dNTPs. Products generated in these reactions were separated on a 20% denaturing polyacrylamide gel, the gel was dried and imaged following overnight exposure to a Fuji BAS1000 imaging plate. Referring now to FIG. 6, an image of (A) the actual gel, (B) a lightened phosphorimage and (C) an enhanced phosphorimage. Lane descriptions for A, B, and C follow: Lane 1 is the control containing purified 10-base primer extended to 11 and 12 bases by template-mediated addition of alpha- 32 P dCTP. Lane 2 includes the same primer that was incubated with double-stranded plasmid DNA at 96° C.
  • Lane 3 includes the same labeled primer that was incubated with double-stranded DNA plasmid at 96° C. for 3 minutes, the reaction was DNA polymerase and all four gamma-modified DNTPs (100 uM, each) were added and the reaction was incubated at 37° C. for 60 minutes.
  • Lane 4 includes the control, purified 10-base primer that was extended to 11 and 12 bases by the addition of alpha- 32 P-dCTP was cycled in parallel with lanes 5-8 reactions.
  • Lane 5 includes the same 32 P-labeled primer that was incubated with double-stranded plasmid DNA at 96° C. for 3 minutes, the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four natural dNTPs (100 uM, each) were added. The reaction was cycled 25 times at 96° C. for 10 seconds, 37° C. for 1 minute, and 70° C. for 5 minutes.
  • Lane 6 includes the same 32 P-labeled primer that was incubated with double-stranded plasmid DNA at 96° C.
  • the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four gamma-modified dNTPs (100 uM, each) were added.
  • the reaction was cycled 25 times at 96° C. for 10 seconds, 37° C. for 1 minute, and 70° C. for 5 minutes.
  • Lane 7 includes nonpurified, 10-base, 32 P-labeled primer that was incubated with double-stranded DNA plasmid at 96° C. for 3 minutes, the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four natural dNTPs (100 uM, each) were added.
  • the reaction was cycled 25 times at 96° C. for 10 seconds, 37° C.
  • Lane 8 includes nonpurified, 10-base, 32 P-labeled primer that was incubated with double-stranded DNA plasmid at 96° C. for 3 minutes, the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four gamma-modified dNTPs were added. The reaction was cycled 25 times at 96° C. for 10 seconds, 37° C. for 1 minute, and 70° C. for 5 minutes.
  • Evident in the reactions involving tagged dNTPs is a substantial decrease in pyrophosphorolysis as compared to reactions involving natural nucleotides.
  • This next example illustrates the synthesis of long DNA polymers using all four ANS tagged ⁇ -phosphate dNTPs.
  • Each primer extension reaction was split into two fractions, and one fraction was electrophoresed through a 20% denaturing gel (as described above), while the other was electrophoresed through a 6% denaturing gel to better estimate product lengths.
  • the gel was dried and imaged (overnight) to a Fuji BAS1000 imaging plate. Referring now to FIG. 7, an image of (A) the actual gel, (B) a lightened phosphorimage of the actual gel, and (C) an enhanced phosphorimage of the actual gel.
  • Lane descriptions for A, B, and C follow: Lane 1 includes 123 Marker with size standards indicated at the left of each panel.
  • Lane 2 contains the control, purified 10-base primer extended to 11 and 12 bases by template-mediated addition of alpha- 32 P dCTP.
  • Lane 3 contains the same 32 P -labeled primer that was incubated with double-stranded plasmid DNA at 96° C. for 3 minutes (to denature template), the reaction was brought to 37° C. (to anneal primer-template), Taq DNA polymerase and all four natural dNTPs (100 uM, each) were added and the reaction was incubated at 37° C. for 60 minutes.
  • Lane 4 includes the same 32 P -labeled primer that was incubated with double-stranded DNA plasmid at 96° C.
  • Lane 5 includes the control, purified 10-base primer that was extended to 11 and 12 bases by the addition of alpha- 32 P -dCTP was cycled in parallel with lanes 5-8 reactions.
  • Lane 6 includes the same 32 P -labeled primer that was incubated with double-stranded plasmid DNA at 96° C. for 3 minutes, the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four natural dNTPs (100 uM, each) were added.
  • the reaction was cycled 25 times at 96° C. for 10 seconds, 37° C. for 1 minute, and 70° C. for 5 minutes.
  • Lane 7 includes the same 32 P -labeled primer that was incubated with double-stranded plasmid DNA at 96° C. for 3 minutes, the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four gamma-modified dNTPs (100 uM, each) were added.
  • the reaction was cycled 25 times at 96° C. for 10 seconds, 37° C. for 1 minute, and 70° C. for 5 minutes.
  • Lane 8 includes nonpurified, 10-base, 32 P -labeled primer that was incubated with double-stranded DNA plasmid at 96° C. for 3 minutes, the reaction was brought to 37° C. for 10 minutes, during which time Taq DNA polymerase and all four natural dNTPs (100 uM, each) were added. The reaction was cycled 25 times at 96° C. for 10 seconds, 37° C. for 1 minute, and 70° C. for 5 minutes. Lane 9 includes nonpurified, 10-base, 32 P -labeled primer that was incubated with double-stranded DNA plasmid at 96° C. for 3 minutes, the reaction was brought to 37° C.
  • the indicated enzyme (Taq DNA Polymerase, Sequenase, HIV-1 Reverse Transcriptase, T7 DNA Polymerase, Klenow Fragment, Pfu DNA Polymerase) were incubated in the manufacturers suggested reaction buffer, 50 ⁇ M of the indicated nucleotide at 37° C. for 30-60 minutes, and the reaction products were analyzed by size separation through a 20% denaturing gel.
  • Taq DNA polymerase efficiently uses the gamma-modified nucleotides to synthesize extended DNA polymers at increased accuracy as shown in FIGS. 4 - 6 .
  • Pfu DNA polymerase does not efficiently use gamma-modified nucleotides and is, thus, not a preferred enzyme for the single-molecule sequencing system as shown in FIG. 9.
  • HIV-1 reverse transcriptase efficiently uses the gamma-tagged nucleotides, and significant fidelity improvement results as shown in FIG. 10.
  • the fidelity of nucleic acid synthesis is a limiting factor in achieving amplification of long target molecules using PCR.
  • the misincorporation of nucleotides during the synthesis of primer extension products limits the length of target that can be efficiently amplified.
  • the effect on primer extension of a 3′-terminal base that is mismatched with the template is described in Huang et al., 1992, Nucl. Acids Res. 20:4567-4573, incorporated herein by reference.
  • the presence of misincorporated nucleotides may result in prematurely terminated strand synthesis, reducing the number of template strands for future rounds of amplification, and thus reducing the efficiency of long target amplification.
  • the present invention provides an improved PCR system for generating increased extension length PCR amplified DNA products comprising contacting a native Taq polymerase with gamma tagged dNTPs of this invention under PCR reaction conditions.
  • the extended length PCR products are due to improved accuracy of base incorporation, resulting from the use of the gamma-modified dNTPs of this invention.

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US09/901,782 US20030064366A1 (en) 2000-07-07 2001-07-09 Real-time sequence determination
US11/007,642 US20050266424A1 (en) 2000-07-07 2004-12-08 Real-time sequence determination
US11/007,797 US7329492B2 (en) 2000-07-07 2004-12-08 Methods for real-time single molecule sequence determination
US11/648,164 US20070172864A1 (en) 2000-07-07 2006-12-29 Composition for sequence determination
US11/648,174 US20070172865A1 (en) 2000-07-07 2006-12-29 Sequence determination in confined regions
US11/648,182 US20070172866A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination using depolymerizing agent
US11/648,722 US20070172868A1 (en) 2000-07-07 2006-12-29 Compositions for sequence determination using tagged polymerizing agents and tagged monomers
US11/648,713 US20070184475A1 (en) 2000-07-07 2006-12-29 Sequence determination by direct detection
US11/648,137 US20070292867A1 (en) 2000-07-07 2006-12-29 Sequence determination using multiply tagged polymerizing agents
US11/648,106 US20070172858A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US11/648,856 US20070275395A1 (en) 2000-07-07 2006-12-29 Tagged monomers for use in sequence determination
US11/648,191 US20070172867A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US11/648,138 US20070172863A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,184 US20100255463A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,115 US20070172861A1 (en) 2000-07-07 2006-12-29 Mutant polymerases
US11/648,136 US20070172862A1 (en) 2000-07-07 2006-12-29 Data stream determination
US12/410,370 US20110014604A1 (en) 2000-07-07 2009-03-24 Methods for sequence determination
US12/412,208 US20100304367A1 (en) 2000-07-07 2009-03-26 Compositions for real-time, single molecule sequence determination
US12/411,997 US20110021383A1 (en) 2000-07-07 2009-03-26 Apparatuses for real-time, single molecule sequence determination
US12/414,417 US20090275036A1 (en) 2000-07-07 2009-03-30 Systems and methods for real time single molecule sequence determination
US12/419,214 US20090305278A1 (en) 2000-07-07 2009-04-06 Sequence determination in confined regions
US12/419,660 US20110059436A1 (en) 2000-07-07 2009-04-07 Methods for sequence determination
US12/724,392 US20100317005A1 (en) 2000-07-07 2010-03-15 Modified Nucleotides and Methods for Making and Use Same

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US10/007,621 Continuation-In-Part US7211414B2 (en) 2000-12-01 2001-12-03 Enzymatic nucleic acid synthesis: compositions and methods for altering monomer incorporation fidelity
US779404A Continuation-In-Part 2000-07-07 2004-12-08
US11/007,642 Division US20050266424A1 (en) 2000-07-07 2004-12-08 Real-time sequence determination
US11/007,797 Division US7329492B2 (en) 2000-07-07 2004-12-08 Methods for real-time single molecule sequence determination
US11/648,184 Continuation US20100255463A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,182 Continuation-In-Part US20070172866A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination using depolymerizing agent
US11/648,106 Continuation US20070172858A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US11/648,713 Continuation US20070184475A1 (en) 2000-07-07 2006-12-29 Sequence determination by direct detection
US11/648,136 Continuation US20070172862A1 (en) 2000-07-07 2006-12-29 Data stream determination
US11/648,115 Division US20070172861A1 (en) 2000-07-07 2006-12-29 Mutant polymerases
US11/648,164 Continuation US20070172864A1 (en) 2000-07-07 2006-12-29 Composition for sequence determination
US11/648,138 Continuation US20070172863A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,856 Division US20070275395A1 (en) 2000-07-07 2006-12-29 Tagged monomers for use in sequence determination
US11/648,191 Continuation US20070172867A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US11/648,174 Division US20070172865A1 (en) 2000-07-07 2006-12-29 Sequence determination in confined regions
US11/648,722 Continuation US20070172868A1 (en) 2000-07-07 2006-12-29 Compositions for sequence determination using tagged polymerizing agents and tagged monomers
US11/648,137 Division US20070292867A1 (en) 2000-07-07 2006-12-29 Sequence determination using multiply tagged polymerizing agents

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US11/007,642 Abandoned US20050266424A1 (en) 2000-07-07 2004-12-08 Real-time sequence determination
US11/648,184 Abandoned US20100255463A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,136 Abandoned US20070172862A1 (en) 2000-07-07 2006-12-29 Data stream determination
US11/648,174 Abandoned US20070172865A1 (en) 2000-07-07 2006-12-29 Sequence determination in confined regions
US11/648,713 Abandoned US20070184475A1 (en) 2000-07-07 2006-12-29 Sequence determination by direct detection
US11/648,722 Abandoned US20070172868A1 (en) 2000-07-07 2006-12-29 Compositions for sequence determination using tagged polymerizing agents and tagged monomers
US11/648,856 Abandoned US20070275395A1 (en) 2000-07-07 2006-12-29 Tagged monomers for use in sequence determination
US11/648,137 Abandoned US20070292867A1 (en) 2000-07-07 2006-12-29 Sequence determination using multiply tagged polymerizing agents
US11/648,164 Abandoned US20070172864A1 (en) 2000-07-07 2006-12-29 Composition for sequence determination
US11/648,115 Abandoned US20070172861A1 (en) 2000-07-07 2006-12-29 Mutant polymerases
US11/648,106 Abandoned US20070172858A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US11/648,138 Abandoned US20070172863A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,191 Abandoned US20070172867A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US12/410,370 Abandoned US20110014604A1 (en) 2000-07-07 2009-03-24 Methods for sequence determination
US12/411,997 Abandoned US20110021383A1 (en) 2000-07-07 2009-03-26 Apparatuses for real-time, single molecule sequence determination
US12/412,208 Abandoned US20100304367A1 (en) 2000-07-07 2009-03-26 Compositions for real-time, single molecule sequence determination
US12/414,417 Abandoned US20090275036A1 (en) 2000-07-07 2009-03-30 Systems and methods for real time single molecule sequence determination
US12/419,214 Abandoned US20090305278A1 (en) 2000-07-07 2009-04-06 Sequence determination in confined regions
US12/419,660 Abandoned US20110059436A1 (en) 2000-07-07 2009-04-07 Methods for sequence determination
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US11/648,184 Abandoned US20100255463A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,136 Abandoned US20070172862A1 (en) 2000-07-07 2006-12-29 Data stream determination
US11/648,174 Abandoned US20070172865A1 (en) 2000-07-07 2006-12-29 Sequence determination in confined regions
US11/648,713 Abandoned US20070184475A1 (en) 2000-07-07 2006-12-29 Sequence determination by direct detection
US11/648,722 Abandoned US20070172868A1 (en) 2000-07-07 2006-12-29 Compositions for sequence determination using tagged polymerizing agents and tagged monomers
US11/648,856 Abandoned US20070275395A1 (en) 2000-07-07 2006-12-29 Tagged monomers for use in sequence determination
US11/648,137 Abandoned US20070292867A1 (en) 2000-07-07 2006-12-29 Sequence determination using multiply tagged polymerizing agents
US11/648,164 Abandoned US20070172864A1 (en) 2000-07-07 2006-12-29 Composition for sequence determination
US11/648,115 Abandoned US20070172861A1 (en) 2000-07-07 2006-12-29 Mutant polymerases
US11/648,106 Abandoned US20070172858A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US11/648,138 Abandoned US20070172863A1 (en) 2000-07-07 2006-12-29 Compositions and methods for sequence determination
US11/648,191 Abandoned US20070172867A1 (en) 2000-07-07 2006-12-29 Methods for sequence determination
US12/410,370 Abandoned US20110014604A1 (en) 2000-07-07 2009-03-24 Methods for sequence determination
US12/411,997 Abandoned US20110021383A1 (en) 2000-07-07 2009-03-26 Apparatuses for real-time, single molecule sequence determination
US12/412,208 Abandoned US20100304367A1 (en) 2000-07-07 2009-03-26 Compositions for real-time, single molecule sequence determination
US12/414,417 Abandoned US20090275036A1 (en) 2000-07-07 2009-03-30 Systems and methods for real time single molecule sequence determination
US12/419,214 Abandoned US20090305278A1 (en) 2000-07-07 2009-04-06 Sequence determination in confined regions
US12/419,660 Abandoned US20110059436A1 (en) 2000-07-07 2009-04-07 Methods for sequence determination
US12/724,392 Abandoned US20100317005A1 (en) 2000-07-07 2010-03-15 Modified Nucleotides and Methods for Making and Use Same

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Effective date: 20090107

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION