WO2007139089A1 - 改良された化学物質の検出方法 - Google Patents
改良された化学物質の検出方法 Download PDFInfo
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- WO2007139089A1 WO2007139089A1 PCT/JP2007/060866 JP2007060866W WO2007139089A1 WO 2007139089 A1 WO2007139089 A1 WO 2007139089A1 JP 2007060866 W JP2007060866 W JP 2007060866W WO 2007139089 A1 WO2007139089 A1 WO 2007139089A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- 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
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/025—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/0004—Oxidoreductases (1.)
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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
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
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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
- C12Q1/6897—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids involving reporter genes operably linked to promoters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
Definitions
- the present invention relates to a biological detection method of a chemical substance using an oxygen electrode.
- the present invention also relates to a transformed cell and apparatus used for the detection method.
- the conventional bioassay method (a method for evaluating the responsiveness and harmfulness of biological materials using biomaterials) is mainly based on indicators such as fish, daphnia, shellfish, etc., cell growth inhibition and specific biological reactions. Although it is possible to evaluate the toxicity of chemical substances in the environment, it is not possible to determine the nature of the toxicity and what kind of chemical substance it is caused by. Evaluation method based on the activity of nitrite-producing bacteria or nitrate-producing bacteria (Japanese Patent Laid-Open No. 06-123705, Japanese Patent Laid-Open No. 2000-206087), Method of evaluation based on the activity of iron bacteria (Japanese Patent Laid-Open No.
- the Reporter Gene Atsy method is a technique for measuring a specific gene activity as a landmark for examining the function of a gene centering on transcriptional activity, and includes the promoter-assie method.
- the promoter assembly method is a method in which a polynucleotide encoding a marker protein is operably linked to the nucleotide sequence of a promoter of a gene to indirectly measure gene expression (Non-patent Document 1).
- a chemical substance is evaluated by using, as an index, changes in the cell response of the microorganism to the chemical substance, for example, cell viability, proliferative capacity, respiration rate, and expression of a specific gene.
- changes in promoter activity as a cellular response that is, marker proteins that are evaluated using marker proteins linked to the promoter as an index are GFP (Green Fluorescence Protein) (Heim, R., C ubitt, AB and Tsien, RY (1995) Nature 373, 663-664; Heim, R "Prasher DC.and Tsien, RY (1994) Proc. Natl. Acad.
- Changes in promoter activity are monitored, for example, by fluorescence measurement in the case of fluorescent proteins such as GFP, and in the case of luciferase by luminescence by enzyme-substrate reaction.
- WO03Z018792 discloses a method for easily identifying a chemical substance existing in the environment using a fluorescence method.
- a polynucleotide comprising a nucleotide sequence containing a yeast gene promoter that is specifically activated by a toxic substance and operably linked to a nucleotide sequence encoding a single fluorescent protein such as GFP.
- the yeast is transformed with a vector containing, and after contacting the transformed yeast with the sample, the expression level of the fluorescent protein is detected by fluorescence measurement, and if an increase in the expression level is observed, it is determined that a toxic substance is present. can do.
- Patent Literature l WO03Z 018792
- Patent Document 2 Japanese Patent Laid-Open No. 2001-252066
- Patent Document 3 Japanese Patent Application Laid-Open No. 2001-258592
- Non-patent literature l Barelle CJ, Manson CL, MacCallum DM, Odds FC, Gow Na, Brown AJ .: GFP as a quantitative reporter of gene regulation in Candida albicans. Yeast 20 04 Mar; 21 (4): 333-40
- luciferase which is an example of a marker protein
- the enzyme-substrate reaction with firefly luciferase and D-firefly luciferin is shown by the following formula.
- luciferase as an enzyme that consumes oxygen as an electron acceptor in an enzyme reaction and oxidizes a substrate
- acid reductase for example, cytochrome C oxidase, phosphate pyridoxamine amine oxidase, dartathon oxidase, glucose oxidase, proline oxidase, amino acid oxidase, ascorbate oxidase, facyl CoA oxidase, galactose oxidase, xanthine oxidase, cholesterol oxidase, sulfur Oxidases such as acid oxidase and sarcosine oxidase and oxygenases such as kynurenine 3-monooxygenase, squalene oxygenase, monooxygenase, tryptophan 2,3 dioxygenase and the like. It is.
- dulcose oxidase and dulcose is shown by the following formula.
- a specific chemical substance activates a promoter of a yeast gene, a base sequence containing such a chemical substance-responsive promoter, and a gene derived from another species homologous to these genes.
- a recombinant cell transformed with a vector containing a polynucleotide to which a polynucleotide encoding reductase is operably linked is prepared, and the recombinant cell and acid reductase are added to a sample containing chemical substances.
- the amount of expressed oxidoreductase was quantified by adding the amount of substrate and measuring the consumption of dissolved oxygen in the sample. This led to the idea that the presence or amount of a chemical substance in a sample can be tested.
- the number of bacteria in a sample solution is measured by preparing a sample solution by dispersing a food subject to bacterial count measurement in the solution and detecting dissolved oxygen in the sample solution.
- a method is disclosed.
- Japanese Patent Laid-Open No. 2001-258592 discloses a method for accurately measuring the drug sensitivity of a target microorganism in a short time by detecting the amount of dissolved oxygen in a solution using an oxygen electrode.
- the first solution containing the microorganism to be measured and the drug and the second solution without the drug each hold the measured current value from the oxygen electrode in time series, respectively.
- the measured current value force moving average value held in series is calculated, and the differential value of the calculated moving average value is calculated by calculating the time derivative value using the least square approximation. It is possible to detect reaction with drugs.
- the method for detecting a chemical substance of the present invention includes (a) a nucleotide sequence including a promoter that responds to a chemical substance among promoters of yeast genes, and a promoter of a gene derived from another species that is homologous to these genes.
- Group power consisting of base sequences Below the selected base sequence A vector comprising a polynucleotide encoding an acid reductase as a marker protein or a polynucleotide operably linked to a polynucleotide encoding an enzyme that oxidizes a substrate using oxygen as an electron acceptor in an enzyme reaction.
- a solution containing at least a test sample, a recombinant yeast, and a substrate for a oxidoreductase that is a marker protein, from an oxygen electrode is characterized by detecting the presence or amount of chemical substances in the environment by holding measured current values in time series and calculating the consumption of dissolved oxygen from the changes in the measured current values.
- the method of the present invention is an enzyme-substrate reaction between an oxidoreductase such as luciferase, oxidase or oxygenase produced from a transformed cell according to the present invention and a substrate for those enzymes. Based on the ability to detect the presence or amount of acid reductase produced by measuring the amount of oxygen consumed.
- an oxidoreductase such as luciferase, oxidase or oxygenase produced from a transformed cell according to the present invention and a substrate for those enzymes.
- transformed cells are used to detect the presence or amount of a chemical substance, it is necessary to consider oxygen consumption due to basal metabolism such as respiration of transformed cells in the measurement.
- the oxygen consumption by the enzyme-substrate reaction when the oxygen consumption by the enzyme-substrate reaction is overwhelmingly higher than the oxygen consumption by the basal metabolism, the oxygen consumption by the basal metabolism is calculated in advance, and this is subtracted from the measured value. It can detect oxygen consumption by enzyme-substrate reaction.
- transformed cells in order to eliminate the influence of oxygen consumption due to basal metabolism, transformed cells can be disrupted and only the enzyme-substrate reaction can be observed.
- FIG. 1 is a block diagram showing an embodiment of a chemical substance measuring apparatus of the present invention.
- FIG. 2 is a schematic view showing the principle of an oxygen electrode of the chemical substance measuring apparatus of the present invention.
- FIG. 3 is a flowchart showing one embodiment of the chemical substance measuring method of the present invention.
- FIG. 4 is a graph showing the time change of the current value in the dissolved oxygen measurement according to the present invention. Explanation of symbols
- a host cell used for the transformation of the present invention it is a matter of course that a human cell is preferable, but a mouse or other mammalian cell may also be used.
- a human cell it is possible to use fish, nematode, and other cells that have been used in the nanoassay method. It is also preferable to use microbial cells because they are easy to cultivate.
- This method is based on the yeast cell gene! /, And the growth of the yeast depends on the salt concentration and other environmental samples. It is a cell.
- the object can also be achieved by replacing the coding region of the yeast gene with a polynucleotide sequence encoding a marker protein without using a vector.
- the polynucleotide construct can be directly introduced into a cell, and the method is well known.
- a nucleotide sequence comprising a promoter of a yeast gene selected from the following group, and a nucleotide sequence comprising a promoter of a gene derived from another species homologous to these genes.
- a recombinant yeast is prepared by introducing a base sequence operably linked to a polynucleotide encoding a marker protein downstream of the selected base sequence.
- nucleotide sequences and amino acid sequences of these yeast genes are disclosed in public databases (eg, German MIPs: Kunststoff Information and enter for Protein Sequence ⁇ unpublished; 5GD: Saccharo myces Genome Database). Can know through.
- the promoter sequence is also open to the public database (SCPD: The Promoter Data of 3 ⁇ 4 accharomyces cerevisiae).
- the “gene having homology to a yeast gene” is a gene containing a base sequence having a homology of 50% or more, preferably 80% or more, in the base sequence of the yeast gene, which is encoded by the yeast gene.
- a polynucleotide construct is obtained by operably linking a polynucleotide encoding a marker protein downstream of the base sequence of the promoter of the gene.
- Methods for operably linking a protein-encoding polynucleotide to a promoter are well known to those skilled in the art. (See, eg, RW Old, SB Primrose Gene Manipulation Fifth Edition, Baifukan, ppl38-165, pp.234-263, 2000).
- marker proteins include luciferases such as firefly luciferase, Renilla luciferase, click beetle luciferase; cytochrome C oxidase, pyridoxamine amine phosphate, glutathione oxidase, glucose oxidase , Proline oxidase, amino acid oxidase, ascorbate oxidase, assileu CoA oxidase, galactose oxidase, xanthine oxidase, cholesterol oxidase, oxalate oxidase, sarcosine oxidase; kynurenine 3-monooxy
- oxygenases such as sigenase, squalene oxygenase, monooxygenase, and tryptophan 2,3-dioxygenase.
- oxidase-related genes include Q 0045, Q0250, Q0275, YBL064c, YBR035c, YBR244w, YDL067c, YDR044w, YDRO 79w, YDR231c, YDR453c, YDR506c, YEL0145, YER014w YER021w, YER058w, Y ER141w, YER145c YLL009c ⁇ YLL018c-a, YLR038c, YLR142w, YLR205c, YLR395c, YML086c, YML129c, YMR020w ⁇ YMR 058w, YMR256c, YNL052w, YOR350c, YPL132w, YPR037c.
- oxygenase-related genes include YBL098w, YDR402c, YGL055w, YGR175c, YGR255c, YHR007c, YHR176w, YJR025c, YJR069c, YJR078w, YJR149w, YLL057c, YLRc Can be mentioned.
- the nucleotide sequences of these yeast genes are disclosed in public databases (for example, German MIPS: Municn Information and enter for Protein Sequence ⁇ US SGD: 3 ⁇ 4accharomyces Genome Database) and can be obtained via the Internet. . Also professional The motor array is also open to the public database (SCPD: The Promoter Database of Sac charomyces cerevisiae).
- a gene derived from another species having homology to the oxidase-related gene or the oxygenase-related gene can also be used.
- Toxic substances that can be detected by the method of the present invention are not particularly limited.
- Two or more recombinant microorganisms that is, two or more pairs transformed with a vector comprising a polynucleotide operably linked to a polynucleotide encoding a marker protein to promoters of different yeast genes
- Toxic substances can be further identified by carrying out the above method for each of the microorganisms. For example, if YLL057C is used as the yeast gene promoter, 2,4-dichlorophenoxyacetic acid, arsenous acid or its salt, cadmium salt, hydrocyanic acid or its salt can be detected, and YLR3 03W is used as the yeast gene.
- benzo (a) pyrene, formaldehyde, manganese ethylenebisdithiocarnomate, mercury salt can be detected It is. Therefore, for example, when YLR303 W is used as a yeast gene, the expression of a marker protein is induced, but when YLL057C is used as a yeast gene, the expression of the marker protein is not induced.
- the quality is identified as benzo (a) pyrene, mercury salt, ethylene bisdithione manganese rubamate or formaldehyde.
- the toxic substance is 2,4-dichlorophenoxyacetic acid, arsenous acid or its salt, cadmium salt, or hydrocyanic acid. Or it is specified as its salt.
- FIG. 1 is a block diagram showing an embodiment of the chemical substance measuring apparatus of the present invention.
- This measuring apparatus adds a substrate for acid reductase encoded by a test sample, a transformed cell, and a polynucleotide introduced into the transformed cell to be examined for the presence or amount of a chemical substance.
- the first cell 1 containing the first solution, the second cell 2 containing the second solution to which the transformed cells are added without adding the test sample, and the first cell 1 attached to the first cell 1 1st oxygen sensor la that detects the amount of dissolved oxygen in the solution and outputs the measured current value and 1st oxygen sensor la that is attached to the second cell 2 detects the amount of dissolved oxygen in the second solution and outputs the measured current value 2Oxygen sensor 2a, first holding unit 3 that holds the measurement current value output from the first oxygen sensor la in time series, and measurement current value output from the second oxygen sensor 2a in time series Measurement current held in time series by the second holding unit 4 and the first holding unit 3 Calculate the moving average value from the values, and calculate the measured current value force moving average value held in time series in the first moving average
- FIG. 2 is a schematic view showing the principle of the chemical substance measuring apparatus of the present invention.
- the cell 1 is composed of a working electrode (working electrode) 21, a reference electrode (reference electrode 22), and a counter electrode (counter electrode) 23, and has an oxygen electrode connected to a measuring device 24.
- a working electrode working electrode
- reference electrode reference electrode
- counter electrode counter electrode
- the promotion of an enzyme-substrate reaction means that a chemical-responsive promoter is activated in response to a chemical and an increased concentration of the enzyme is expressed.
- the presence or amount of a chemical substance in a specimen can be detected by measuring the amount of dissolved oxygen.
- the present invention relates to a test sample and a polynucleotide encoding an enzyme that oxidizes a substrate using oxygen as an electron acceptor in an enzyme reaction, or an enzyme that acidifies a substrate using oxygen as an electron acceptor in an enzyme reaction.
- a recombinant cell transformed with a vector comprising a polynucleotide to which a polynucleotide encoding operably is linked, and an enzyme that oxidizes a substrate using oxygen as an electron acceptor in the enzyme reaction
- the amount of dissolved oxygen in the solution containing the substrate is detected using an oxygen electrode, and the output signal from the oxygen electrode is collected at a second time interval for a first predetermined time.
- a chemical substance measuring method characterized in that the presence or amount of a chemical substance in a test sample is detected by calculating a change in the amount of dissolved oxygen from the change.
- the first predetermined time refers to the time from the start of measurement until the current falls below a predetermined current value, until a plateau is reached, or until a predetermined time elapses.
- step SP1 the test sample and the transformed cell are added to the solution contained in the first cell 1, and the test sample is not added to the solution contained in the second cell 2, and the transformed cell is added.
- step SP2 detection of the dissolved oxygen amount by the first oxygen sensor la and the second oxygen sensor 2a is started, and in step SP3, measured current values output from the first oxygen sensor la and the second oxygen sensor 2a
- step SP4 the measured current value force moving average value held in time series is calculated in step SP4, and in step SP5, the calculated moving average value is calculated from the pair to the least square.
- step SP6 the presence of the chemical substance is detected based on the calculated time derivative values, and the series of processes is terminated as it is.
- the ability to measure the dissolved oxygen content of the first solution and the second solution at the same time and detect the presence or abundance of the chemical substance from the moving average value The power described for one specific example The dissolved solution of the first solution and the second solution The amount of oxygen can also be measured sequentially.
- the measurement method using the moving average value is preferable because it has high measurement accuracy, but it can also measure the time until the dissolved oxygen in the solution stored in the cell is consumed.
- Yeast Sacharomyces cerevisiae S288C (a SUC2mal mel gap2 CUP1) was cultured at 25 ° C. in YPD medium (yeast extract 1%, polypeptone 2%, glucose 2%). In the logarithmic growth phase, one of the following chemicals toxic to the cells was added and cultured for another 2 hours. A control group was cultured under the same conditions without adding chemical substances. The concentration of the chemical substance was selected so as to inhibit the growth of the fermentation mother but not to kill it.
- the cells were collected by centrifugation. To this was added sodium acetate buffer (50 mM sodium acetate, 10 mM EDTA, 1% SDS), shaken at 65 ° C. for 5 minutes, returned to room temperature, and then the supernatant was obtained twice. To this was added 1 Z of 2 volumes of phenol Z black mouth form solution and centrifuged to obtain a supernatant, and an equal volume of black mouth form was added thereto and centrifuged to obtain a supernatant. Isopropanol containing an equal volume of 0.3 M sodium acetate was left in the supernatant at room temperature for 30 minutes and then centrifuged to obtain a total RNA precipitate.
- sodium acetate buffer 50 mM sodium acetate, 10 mM EDTA, 1% SDS
- RNA was isolated from this total RNA by the following method. Since mRNA has a poly A chain at the end, it was trapped with a polynucleotide having a poly T structure immobilized on the surface of latex particles, and then washed and eluted with a spin column ( Oligotex-dT30 ⁇ Super> mRNA Purification Kit, Takara). This mRNA is reverse-transcribed using a fluorescently labeled nucleotide (Super Script II Reverse Transcriptase; Catalog No. 18064-014, GiBeoBRL), and Cy 3-dUTP or Cy 5-dUTP during reverse transcription.
- a fluorescently labeled nucleotide Super Script II Reverse Transcriptase; Catalog No. 18064-014, GiBeoBRL
- Cy 3-dUTP or Cy 5-dUTP during reverse transcription.
- the labeled cDNA was obtained. [0041] This labeled cDNA was dissolved in TE buffer (10 mM Tris-HCl / lmM EDTA, pH 8.0) and dropped onto a DNA chip (manufactured by DNA Chip Laboratory) containing all the yeast genes at 65 ° C. Hybridize for more than 12 hours. The fluorescence intensity of this DNA chip is read with a scanner, and the ratio to the fluorescence intensity when no chemical substance is added, that is, the amount of expressed mRNA in the presence of a chemical substance, is shown in Lists 1 to 9 as the amount of expressed mRNA in the absence of a chemical substance. .
- “strength” in the rightmost column is a value obtained by dividing the mRNA expression level of each gene in the control cells by the average value of the expression levels of all genes.
- the mRNA expression level is large, and the gene is particularly useful for detection of toxic substances.
- the expression of a specific yeast gene in the presence of a toxic substance in this way is considered to be due to the toxic substance activating the promoter of the gene. Therefore, the present inventors prepared a vector containing a polynucleotide in which a polynucleotide encoding a marker protein is operably linked to a polynucleotide containing a yeast gene promoter, and transformed yeast cells with the vector.
- the promoter assembly method is a method for measuring the gene expression level in a non-destructive manner by substituting the expression level of the marker gene for intracellular changes in mRNA.
- the genes selected to detect chemicals are expressed in the absence of chemicals, and therefore marker proteins are also present in the absence of chemicals.
- the behavior of a yeast gene when a test sample is added is measured by a change in the expression level of a marker protein, and the presence and type of a toxic substance is estimated. For this reason, it is desirable that the production of the marker protein is small in the absence of a chemical substance, and the production of the marker protein is large in the presence of a chemical substance.
- the strength (the expression level of the gene in the control cell Z the average value of the expression levels of all genes) is preferably 1.5 or less, more preferably 1 or less, and even more preferably Is 0.5 or less, and the expression ratio (expressed in the presence of a chemical substance mRNAZ expressed in the absence of a chemical substance) is preferably 3 More preferably, 10 or more, and still more preferably 20 or more are selected.
- Primers for amplifying a polynucleotide containing the promoter sequence of the yeast gene YKL071w by PCR were prepared. Primers are designed using Oligo4.0-S, Sequencherl Macintosh, which is software for primer design. The base sequence of the upper primer is
- the base sequence of the lower primer is the base sequence of the lower primer.
- PCR uses a yeast chromosome (Saccharomyces cerevisiae S288C, Cat. 40802, Research Genetics, Inc.) as a template, and a commercially available kit (KOD DNA Polymerase; code KOD-101, Toyobo) as a reagent.
- yeast chromosome Sacharomyces cerevisiae S288C, Cat. 40802, Research Genetics, Inc.
- KOD DNA Polymerase KOD-101, Toyobo
- the vector used is a YEp-type shuttle vector that replicates in both E. coli and yeast.
- PYES2 pYES2, Catno: V825—20, Invirtogen Corporation, USA
- SEQ ID NO: 4 a polynucleotide encoding a marker protein, pyridoxamine oxidase, which is a marker protein, is obtained by PCR amplification of the gene YBR03 5c using yeast chromosomal DNA as a template.
- a vector was prepared in which an oxidase was inserted into the multiple cloning site of pYES2. Thereafter, the GAL1 promoter portion of PYES2 is substituted with a polynucleotide (SEQ ID NO: 4) containing the promoter sequence of YKL071w, which is the target yeast gene, to obtain a target plasmid vector.
- SEQ ID NO: 4 a polynucleotide containing an oxidase and a promoter sequence is performed by selecting an appropriate restriction enzyme.
- yeast Saccharomyces cerevisiae W303 is transformed with this plasmid vector.
- the transformation procedure is shown below.
- the recombinant yeast prepared in Example 2 is grown to a steady state by shaking culture at 25 ° C. in SD medium (adenine, histidine, tributophan, leucine).
- Steady-state yeast is diluted 500-fold with SD medium and cultured with shaking at 25 ° C for 15 hours. After confirming that the absorbance at 600 nm is 0.2 to 0.5 in the logarithmic growth phase Loaded with different concentrations of chemical TPN. Solutions A and B with final concentrations of 0.0053 ppm, 0.053 ppm, and 0.53 ppm, respectively. And
- Measurement solution A, B, or C is stored in the first cell of the chemical substance measurement apparatus shown in the block diagram of FIG. 2, and the control solution is stored in the second cell to measure the amount of dissolved oxygen. Start. Add the pyridoxamine phosphate to the measurement solution A, B or C and standard solution S and start the measurement.
- the chemical substance (TPN) impregnated in each measurement solution is compared. It is possible to know the amount of pyridoxamine oxidase phosphate produced by the reaction, and to detect the presence or abundance of the chemical.
- Fig. 4 shows the time variation of the current value in the measurement of dissolved oxygen in measurement solutions A, B, C and standard solution S.
- Figure 4 shows that standard solution S has no oxidase expression, and therefore, for measurement solutions A, B, and C where the current value does not change, the initial concentration of chemical substance (TPN) increases as the concentration increases. This shows that the steady-state value when the plateau reaches a large rate of decrease in the current value also decreases.
- TPN chemical substance
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| Application Number | Priority Date | Filing Date | Title |
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| US12/302,416 US20100041089A1 (en) | 2006-05-29 | 2007-05-29 | Improved method for detecting chemical substances |
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| JP2006149044A JP2007312750A (ja) | 2006-05-29 | 2006-05-29 | 改良された化学物質の検出方法 |
| JP2006-149044 | 2006-05-29 |
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| US (1) | US20100041089A1 (ja) |
| JP (1) | JP2007312750A (ja) |
| KR (1) | KR20090010123A (ja) |
| CN (1) | CN101460608A (ja) |
| WO (1) | WO2007139089A1 (ja) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4957118B2 (ja) * | 2006-08-09 | 2012-06-20 | ダイキン工業株式会社 | 改良されたプロモーターアッセイ法 |
| US20150044710A1 (en) * | 2013-08-09 | 2015-02-12 | University Of Calcutta | Enzymatic sensors and methods for their preparation and use |
| CN108949600B (zh) * | 2018-07-11 | 2022-02-08 | 天津大学 | 基因的缺失及其应用,缺失该基因的菌株及其在提高微生物次级代谢产物的产量中的应用 |
| US10678150B1 (en) | 2018-11-15 | 2020-06-09 | Applied Materials, Inc. | Dynamic generation of layout adaptive packaging |
| CN109735606B (zh) * | 2019-02-18 | 2022-02-01 | 浙江师范大学 | 荧光定量pcr对吡虫啉水体污染的快速检测方法 |
| CN111693595B (zh) * | 2020-05-29 | 2022-10-25 | 江苏大学 | 一种基于电化学细胞传感器评价农药毒性的方法 |
Citations (3)
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| WO1998038336A1 (en) * | 1997-02-28 | 1998-09-03 | E.I. Du Pont De Nemours And Company | A method for identifying the site of action of xenobiotic chemicals |
| JP2001258592A (ja) * | 2000-03-17 | 2001-09-25 | Natl Inst Of Advanced Industrial Science & Technology Meti | 薬剤感受性測定方法およびその装置 |
| WO2003018792A1 (en) * | 2001-08-24 | 2003-03-06 | National Institute Of Advanced Industrial Science And Technology | Method of detecting toxic substance |
-
2006
- 2006-05-29 JP JP2006149044A patent/JP2007312750A/ja active Pending
-
2007
- 2007-05-29 KR KR1020087030469A patent/KR20090010123A/ko not_active Ceased
- 2007-05-29 WO PCT/JP2007/060866 patent/WO2007139089A1/ja not_active Ceased
- 2007-05-29 CN CNA2007800200665A patent/CN101460608A/zh active Pending
- 2007-05-29 US US12/302,416 patent/US20100041089A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998038336A1 (en) * | 1997-02-28 | 1998-09-03 | E.I. Du Pont De Nemours And Company | A method for identifying the site of action of xenobiotic chemicals |
| JP2001258592A (ja) * | 2000-03-17 | 2001-09-25 | Natl Inst Of Advanced Industrial Science & Technology Meti | 薬剤感受性測定方法およびその装置 |
| WO2003018792A1 (en) * | 2001-08-24 | 2003-03-06 | National Institute Of Advanced Industrial Science And Technology | Method of detecting toxic substance |
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| BARELLE C.J. ET AL.: "GFP as a quantitative reporter of gene regulation in Candida albicans", YEAST, vol. 21, 2001, pages 333 - 340, XP003019725 * |
| GOULSBRA A.M. ET AL.: "Surface hygiene monitored using a reporter of fis in Escherichia coli", JOURNAL OF APPLIED MICROBIOLOGY, vol. 91, no. 1, July 2001 (2001-07-01), pages 104 - 109, XP003019724 * |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20090010123A (ko) | 2009-01-28 |
| CN101460608A (zh) | 2009-06-17 |
| US20100041089A1 (en) | 2010-02-18 |
| JP2007312750A (ja) | 2007-12-06 |
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