WO2004111203A1 - 哺乳動物培養細胞抽出液およびその調製方法、ならびに該抽出液を用いた無細胞系タンパク質合成方法 - Google Patents
哺乳動物培養細胞抽出液およびその調製方法、ならびに該抽出液を用いた無細胞系タンパク質合成方法 Download PDFInfo
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- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
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- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
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- the present invention relates to a cell-free protein synthesis method using a cultured mammalian cell extract, and a method for preparing the extract.
- an expression system (hereinafter, sometimes referred to as a “cell system”) using living cells such as yeast or mammalian cultured cells by genetic recombination technology is widely used.
- living cells maintain their self-function (there is a tendency to exclude foreign proteins, and expression of cytotoxin proteins in living cells makes many proteins difficult to express, such as cells not growing).
- a genetic information translation system of an organism is prepared in a test tube by adding a substrate or an enzyme to the cell lysate / extract, and the target protein is encoded.
- Cell-free protein synthesis is known in which an mRNA is used to reconstruct a synthetic system in which amino acids can be linked in a desired order to the required number of residues. In such a cell-free protein synthesis, under the constraints of the above-mentioned cell-based protein synthesis, it is possible to ⁇ Because no manipulation is required, protein synthesis can be performed in a shorter time than cell lines. Can be performed.
- cell-free protein synthesis is expected to be a promising expression method because it enables mass production of proteins consisting of amino acid sequences not used by living organisms;
- the use of various cell lysates or extracts for cell-free protein synthesis has been studied and research is under way.
- the heron reticulocyte system involves a very complicated procedure of subcutaneously injecting an acetyl phenylhydrazine solution into the heron, and 4-5 days after administration, collecting blood from the ear of the heron and preparing a lysate therefrom.
- the extract is prepared by crushing the cells by depressurizing the CHO under pressure in an atmosphere of an inert gas to prepare an extract. Equipment is required.
- the protein synthesis ability in a cell-free system is greatly affected by the number of cells, gas pressure, and pressurization time during the preparation of the extract, complicated operations are required to set the conditions.
- the amount of protein that can be synthesized is very small, and the protein synthesis activity can be measured only by incorporation of the radiolabeled amino acid. Therefore, development of an extract that is easy to prepare and has a high protein synthesis amount derived from mammalian cultured cells and a method for preparing the same has been desired.
- the present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to prepare a mammalian culture for cell-free protein synthesis that is easy to prepare and has a higher protein synthesis amount than before.
- An object of the present invention is to provide a method for preparing a cell extract, a mammalian cell extract, and a cell-free protein synthesis method using the mammalian cell extract.
- the present inventors have conducted intensive studies to solve the above problems, and as a result, completed the present invention. That is, the present invention is as follows.
- a method for preparing a cultured milk cell extract comprising at least a step of rapidly freezing mammalian cultured cells suspended in a liquid for extraction.
- the preparation method according to claim 7, wherein the cultured mammalian cells are cultured cells derived from Chinese hamster ovary (GHO).
- FIG. 1 is a graph showing the experimental results of Example 2 and shows a heat retention step with respect to the amount of synthesis (for a certain period of time before the synthesis reaction was carried out in a state where components other than foreign mRNA were contained in the cell-free protein synthesis reaction solution). The effect of the presence or absence of heat retention is shown.
- FIG. 2 is a graph showing the experimental results of Example 2, and shows the influence of the composition of the reaction solution and the retention time in the heat retaining step on the synthesis amount.
- the present invention relates to a method for preparing a cultured mammalian cell extract by extracting from cultured mammalian cells, wherein the cultured mammalian cells suspended in the extracting solution are rapidly frozen: Its major feature is that it is contained.
- a cultured mammalian cell extract by such a method, cells can be crushed in a more relaxed state as compared with the conventional method described in Patent Document 1, and the cell-free Since essential components for system protein synthesis can be taken out of cells without destroying them, it is possible to easily prepare a mammalian cell culture extract with a higher protein synthesis amount in a cell-free system than before. Wear. Further, according to the method of the present invention, contamination of RNase or the like from used equipment or the like can be prevented.
- rapidly freezing refers to freezing cultured mammalian cells for 10 seconds or less, preferably 2 seconds or less.
- the temperature at which the cultured mammalian cells are rapidly frozen is usually ⁇ 80 ° C. or lower, preferably ⁇ 150 ° C. or lower. Rapid freezing at temperatures exceeding -80 ° C tends to inactivate the components essential for protein synthesis and reduce the protein synthesis ability.
- the rapid freezing of the cultured mammalian cells can be achieved by using, for example, an inert gas such as liquid nitrogen or liquid helium, but is preferably performed using easily available and inexpensive liquid nitrogen.
- an inert gas such as liquid nitrogen or liquid helium
- thawing may be performed, for example, by thawing in a 10 ° C to 20 ° C water bath or an ice water bath, and at room temperature (25 ° C).
- 0 ° C to 20 ° C (particularly 4 ° C
- the thawing is preferably carried out in a water bath or an ice water bath at 110 ° C.).
- Centrifugation of the thawed cultured mammalian cells is carried out under conditions commonly used in the art (10,000 X g to 50, OOO X g, 0 ° C to 10 ° C, 10 minutes to 60 minutes). Just go.
- the cultured mammalian cells used in the present invention are not particularly limited, and for example, conventionally known cultured cells derived from appropriate mammals such as humans, rats, mice, and monkeys can be used.
- the cultured mammalian cells of the present invention may be cells derived from any tissue, and include, for example, blood cells, gonad-derived cells, lymphoma (lymphoma) -derived cells, other tumor cells, and stem cells. Can be used without restriction. Among them, lymphoma-derived cells are preferably used because suspension culture is possible and culturing and subculture are easy. In addition, CHQ cells can be cultured not only in suspension culture but also in serum-free medium, which facilitates culture and passage. Furthermore, CHO cells are preferably used because they are widely used in cell systems, have high protein synthesis ability, and can expect the same in cell-free systems.
- the extraction solution used in the preparation method of the present invention is not particularly limited, but preferably contains at least a protease inhibitor.
- the use of an extract containing a protease inhibitor inhibits the activity of proteases contained in extracts derived from cultured mammalian cells, and prevents the protease from undesirably degrading active proteins in the extracts.
- the protease inhibitor is not particularly limited as long as it can inhibit the activity of protease, for example, phenylmethanesulfonyl fluoride (hereinafter, may be referred to as rPMSFj), aprotinin, bestatin, and leudium.
- rPMSFj phenylmethanesulfonyl fluoride
- aprotinin bestatin
- leudium leudium.
- pepstatin A E-64 (L-trans-epoxysuccinylleucylamide-4-guanidine / butane), ethylenediaminetetraacetic acid, phosphoramidone, etc.
- protease inhibitor which acts as an inhibitor having high specificity for the serine protease.
- protease inhibitor cocktail a mixture of several kinds
- the extraction solution used in the present invention preferably contains at least a potassium salt, a magnesium salt, dithiothreitol, and a buffer in addition to the protease inhibitor. ! The potassium salt is not particularly limited as long as it does not inhibit the action of the present invention.
- potassium acetate, potassium carbonate, potassium hydrogen carbonate, potassium chloride, dipotassium hydrogen phosphate, dipotassium hydrogen citrate It can be used in a general form such as potassium sulfate, potassium dihydrogen phosphate, potassium iodide, potassium phthalate, and among others, potassium acetate is preferred.
- Potassium salts act as cofactors in protein synthesis reactions.
- the content of the potassium salt in the extraction solution is not particularly limited, but from the viewpoint of storage stability, for example, in the case of a monovalent potassium salt such as potassium acetate, the content is preferably 10 mM to 500 mM. More preferably, the content is 20 mM to 300 mM.
- the magnesium salt is not particularly limited as long as it does not inhibit the action of the present invention.
- examples thereof include magnesium acetate, magnesium sulfate, magnesium chloride, magnesium citrate, magnesium hydrogen phosphate, magnesium iodide, and magnesium lactate. It can be used in a general form such as magnesium nitrate, magnesium oxalate, etc. Among them, it is preferable to use magnesium acetate.
- Magnesium salts also act as cofactors in the protein synthesis reaction.
- the content of the magnesium salt in the extraction solution is not particularly limited, but from the viewpoint of storage stability, for example, in the case of a divalent salt such as magnesium acetate, the content may be 0.1 mM to 1 OmM. More preferably, it is contained in the range of 0.5 mM to 5 m
- the above dithiothreitol (hereinafter sometimes referred to as “DTT”) is compounded for the purpose of preventing oxidation, and is preferably contained in the extraction solution in a range of 0.1 mM to 10 mM. And more preferably 0.5 mM to 5 mM.
- a buffer include, but are not particularly limited to, HEPES-KOH, Tris-HCI, sodium acetate monoacetate, sodium citrate monohydrate, phosphoric acid, boric acid, MES, PIPES, etc. Can be.
- Buffering agent the P H of the obtained extract to use something like held in the 4 to 1 0 to use something like good Mashigu pH is maintained in the 6 to 8.5 Is more preferred. If the pH of the extract is less than 4 or the pH exceeds 10, the components essential for the reaction of the present invention may be denatured. From such a viewpoint, it is particularly preferable to use HEPES-KOH (pH 6 to 8.5).
- HEPES-KOH pH 6 to 8.5
- the content of the buffer in the extraction solution is preferably 5 mM to 200 mM, more preferably 10 mM to 100 mM. preferable.
- the calcium salt is not particularly limited as long as it does not inhibit the action of the present invention. Examples thereof include calcium chloride, calcium acetate, calcium sulfate, calcium citrate, calcium iodide, calcium lactate, and calcium lactate.
- calcium chloride is preferably used.
- the content of calcium chloride is not particularly limited, but is preferably 0.1 mM to 10 mM, and more preferably 0.5 mM to 5 mM, from the viewpoint that the effect of improving the protein synthesis ability can be effectively exhibited. More preferably, it is contained.
- the amount of glycerol added is not particularly limited.From the viewpoint that the effect of improving the protein synthesis ability can be effectively exerted, 5 (v / v)% to 80 (v / v )% Is preferred to be added 10 (v / v)% ⁇
- the procedure from cell disruption to obtaining a cultured mammalian cell extract for cell-free protein synthesis is not particularly limited.
- the supernatant after centrifugation (supernatant 1) is directly used for mammalian culture.
- Cell extract may be used, or supernatant 1 may be further centrifuged and the resulting supernatant (top Clarified 2) may be used as a mammalian cell extract.
- the conditions for centrifugation of the supernatant 1 are the same as those described above (10,000 X g to 50, OOO X g, 0 ° C to 10 ° C, 10 minutes to 60 minutes). Just do it.
- gel filtration may be performed, and a fraction near the highest absorbance at 280 nm from the filtrate after gel filtration may be fractionated to prepare an extract.
- the following procedure may be performed.
- a buffer having a conventionally known appropriate composition can be used without any particular limitation. For example, 1 OmM to 100 mM HEPES-KOH (pH 6 to 8.5), 20 mM to 20 mM 300 mM potassium acetate, 0.5 mM to 5 mM magnesium acetate, 0.5 ml!
- a gel filtration buffer containing 55 mM DTT, 0.01 mM to 5 mM PMSF can be used.
- the filtrate obtained by gel filtration can efficiently elute fractions with a high protein synthesis capacity of 0.1 m to 1 mL as one fraction. From the viewpoint of good fractionation, it is preferable that 0.4 mL to 0.6 mL be one fraction.
- fractions having an absorbance of 10 or more at 280 nm are collected from the filtrate after gel filtration.
- This processing for example using a device such as Ultrospe C 3300p rO (manufactured by Amersham Biosciences), for each fraction the absorbance was measured in the 280 nm, a sample was collected highest near fractions this absorbance, this Use as an extract.
- the cultured mammalian cells to be subjected to the preparation method of the present invention are preferably washed with a washing solution before the rapid freezing, in order to avoid bringing the culture medium used for culture into the translation reaction solution. .
- the composition of the washing solution may be the same as the composition of the above-mentioned extraction solution. Washing with a washing solution is performed by adding the washing solution to the cultured mammalian cells and centrifuging (eg, 700 X g , 10 minutes, 4 ° C).
- the volume of the washing solution used for washing is preferably 5 mL to 100 mL per 1 g of cultured mammalian cells with a wet weight of 1 g, more preferably 10 mL to 50 mL, because the medium is completely washed away. .
- the number of times of washing is preferably 1 to 5 times, more preferably 2 to 4 times.
- the amount of cultured mammalian cells used in the preparation method of the present invention is not particularly limited, but is 0.1 g to 5 g per 1 mL of the extraction liquid in order to keep the extraction efficiency optimal. Is preferred. ⁇ 0.5 g to 2 g is more preferred.
- the cultured mammalian cell extract prepared by the method of the present invention can be suitably used for cell-free protein synthesis.
- the cultured mammalian cell extract preferably contains an extract derived from cultured mammalian cells at a protein / protein concentration of 1 mg / mL to 200 mgZmL. L OmgZmL ⁇ !! More preferably OOmgZmL.
- the effect of the present invention may be such that the concentration of the essential components may be low and a sufficient synthesis reaction may not be performed. If the content protein concentration of the substance exceeds 200 mgZmL, the extract itself has high viscosity, which may make it difficult to operate.
- the content of the extract derived from cultured mammalian cells in the extract is determined by measuring the protein concentration, for example, by measuring the protein concentration using a BCA Protein assay Kit (manufactured by PIERCE). It is determined. Specifically, add 0.1 mL of the sample to 2 mL of the reaction reagent, react at 37 ° C for 30 minutes, and use a spectrophotometer (Ultrospec3300 pro, manufactured by Amersham Bioscience) at 562 nm. As a control, normal serum albumin (BSA) is used, and a calibration curve is prepared. It can be measured by such a method.
- BSA normal serum albumin
- the extract of the present invention contains an extract derived from cultured mammalian cells at a protein concentration of 1 OmgZmL to 1OOmgZmL, 20 mM to 300 mM potassium acetate, 0.5 mM to 5 mM magnesium acetate, 0.5 mM to 5 mM. . DTT, of 0 01 mM ⁇ 5 mM of PMSF, 1 OmM ⁇ : I OOmM0HEPES- KOH (. P H6 ⁇ 8 5) preferably implemented to contain.
- the present invention also provides a cell-free protein synthesis method using the above extract.
- any protein for example, a protein that becomes cytotoxic in living cells, can be synthesized in a short time. It becomes.
- an extract derived from eukaryote cultured mammalian cells is used, it is possible to synthesize glycoproteins in a cell-free system, and it is possible to synthesize many types of proteins without any particular limitation. be able to.
- the cell-free protein synthesis reaction in the present invention refers to a protein synthesis reaction using only a cell-free translation system that reads information of mRNA and synthesizes a protein.
- the composition of the cell-free protein synthesis reaction solution prepared using the extract obtained by the method of the present invention is not particularly limited, and a conventionally known composition may be appropriately selected. Is preferably 10 (vZv)% to 80 (vZv)%, particularly preferably 30 (v / v) 0 / & to 60 (vZv)%.
- the content of the extract derived from cultured mammalian cells in the entire reaction solution is adjusted to be 0.1 mgZmL to 160 mgZmL in protein concentration, preferably 3 mg / mL to 60 mg / mL. More preferably, it is prepared to be mL. If the content of the extract is less than Q.I mgZmL or more than 160 mgZmL in protein concentration, the synthesis rate of the target protein may be reduced.
- the cell-free protein synthesis reaction solution contains exogenous mRNA, potassium salt, magnesium salt, DTT, adenosine triphosphate, guanosine triphosphate, creatine phosphate, as components excluding the extract obtained by the method of the present invention.
- the exogenous mRNA used in the above reaction solution refers to the mRNA not derived from the cultured mammalian cells used to prepare the extract, and if the mRNA is not derived from such cultured mammalian cells, the encoded protein (peptide ) May be one that encodes a toxic protein / protein, or one that encodes a glycoprotein / protein.
- mRNA contained in the reaction mixture is exogenous mRNA or mRNA derived from cultured mammalian cells used to prepare the extract is determined by first isolating and purifying mRNA from the reaction mixture. Thereafter, cDNA can be synthesized by reverse transcriptase, and the nucleotide sequence of the obtained cDNA can be determined by comparing the nucleotide sequence with that of a known foreign mRNA.
- the exogenous mRNA used in the reaction solution is not particularly limited in the number of bases, and all mRNAs need not have the same number of bases as long as the target protein can be synthesized.
- Each mRNA may have a plurality of bases deleted, substituted, inserted or added as long as the sequences are homologous to the extent that the target protein can be synthesized.
- Foreign mRNA used in the present invention may be a commercially available, a commercially available vector OR F (Open reading frame) of the protein of interest, e.g., pT N T Vector (Promega) for 5 'single ⁇ -globin leader It may be inserted downstream of one sequence, and the mRNA obtained by the transcription reaction using this may be used.
- a foreign mRNA having a cap structure added by adding a methylated ribonucleotide or the like during the transcription reaction may be used.
- the exogenous mRNA preferably contains 1 / mL to 1 000; U gZmL, more preferably 10 gZmL to 500 ⁇ gZmL, . If the amount of exogenous mRNA is less than 1 ⁇ gZmL or more than 1,000 ⁇ gZmL, the rate of protein synthesis tends to decrease.
- the potassium salt in the reaction solution the various potassium salts described above as a component of the extraction solution, preferably potassium acetate, can be preferably used.
- the potassium salt is preferably contained in the reaction solution at 10 mM to 500 mM, more preferably at 20 mM to 300 mM, from the same viewpoint as in the case of the potassium salt in the extraction solution described above.
- the various magnesium salts described above as components of the extraction solution preferably magnesium acetate, can be preferably used.
- the magnesium salt is preferably contained in the reaction solution at a concentration of 0.5 mM to 5 mM, preferably from 0.5 mM to 5 mM. Is more preferable.
- the DTT in the reaction solution is preferably contained in the range of 0.1 mM to 10 mM, more preferably in the range of 0.5 mM to 5 mM, from the same viewpoint as the DTT in the extraction solution described above.
- Adenosine triphosphate (hereinafter sometimes referred to as “ATPJ”) in the reaction solution is preferably contained at 0.01 mM to 10 mM in the reaction solution from the viewpoint of the rate of protein synthesis. 0.1% to 5 mM is more preferable, and if ATP is less than 0.01 mM or exceeds 10 mM, the protein synthesis rate power tends to decrease.
- GTP guanosine triphosphate
- the reaction solution is preferably contained at 0.01 mM to 10 mM in the reaction solution, More preferably, the content is 0.05 mM to 5 mM. If GTP is less than 0.01 mM or exceeds 10 mM, the rate of protein synthesis tends to decrease.
- Creatine phosphate in the reaction solution is a component for continuously synthesizing proteins. There, it is formulated for the purpose of regenerating ATP and GTP.
- creatine phosphate is preferably contained in the reaction solution at 1 mM to 200 mM, more preferably at 10 mM to 100 mM. If the creatine phosphate is less than "I mM", a sufficient amount of ATP and GTP are not easily regenerated, resulting in a decrease in the rate of protein synthesis. If it exceeds, creatine kinase in the reaction solution is a component for continuously synthesizing the protein, and creatine kinase, together with creatine phosphate, tends to act as an inhibitor and reduce the rate of protein synthesis. Formulated for the purpose of regenerating ATP and GTP.
- creatine kinase is preferably contained in the reaction solution in an amount of 1 J 1g mL to 1 000 ⁇ gZmL, and more preferably 10 ⁇ gZmL to 500 j «gZmL in the reaction solution. More preferred. If the creatine kinase is full of 1 g / mL *, a sufficient amount of ATP and GTP are not easily regenerated, resulting in a decrease in the rate of protein synthesis. If it exceeds, it acts as an inhibitor, and the rate of protein synthesis tends to decrease.
- the amino acid component in the reaction solution was composed of 20 kinds of amino acids, namely, palin, methionine, glutamic acid, alanine, leucine, phenylalanine, glycine, proline, isoleucine, tributan, asparagine, serine, tolenin, histidine, and asparagine. It contains at least 20 kinds of amino acids: acid, oral synth, lysine, glutamine, cystine, and arginine.
- the amino acids also include radioisotope-labeled amino acids. Furthermore, if necessary, it may contain a modified amino acid.
- the amino acid component generally contains approximately equal amounts of each type of amino acid.
- the above-mentioned amino acid component power is preferably contained in the reaction solution ⁇ 1; UM to 10000 ⁇ , preferably 10 iM to 200 ⁇ . Is more preferable.
- the amount of the amino acid component is less than 1 ⁇ m or exceeds 1 000 mm, the rate of protein synthesis tends to decrease.
- the RNase inhibitor in the reaction solution is undesirably digested by the RNase derived from mammalian cultured cells mixed in the extract during the cell-free protein synthesis of the present invention, whereby the foreign mRNA and tRNA are undesirably digested, and the protein It is blended for the purpose of preventing the synthesis from being hindered, and preferably contains 0.1 UZL to 100 UZjtL in the reaction solution.It contains 0.5 UZjU to IOUZ JUL. And more preferred. If the RNase inhibitor is less than 0.1 U / 1_, RNase degradation activity tends to be unable to be sufficiently suppressed. If the RNase inhibitor exceeds 10 OUZ / L, it tends to harm the protein synthesis reaction.
- the tRNA in the reaction solution corresponds to the above 20 kinds of amino acids, and contains approximately equal amounts of the t: kinds of tRNA.
- the reaction solution preferably contains 1 / gZmL to 1 000 gZmL, more preferably 10 g / mL to 500 gZmL. If the tRNA force is more than ⁇ gZm or more than 100 gZmL, the rate of protein synthesis tends to decrease.
- the buffer contained in the reaction solution those similar to the above-mentioned extract of the present invention can be suitably used, and for the same reason, HEPES-KOH (pH 6 to 8, 5) is preferably used. , No.
- the buffer preferably contains 5 mM to 200 mM, more preferably 1 OmM to 100 Mm. Further, it is preferable that spermidine is further added to the reaction solution for the purpose of improving the translation reaction rate.
- Spermidine is preferably contained in the reaction solution at a concentration of 0.01 mM to 10 ⁇ , more preferably 0.05 mM to 5 mM, and when spermidine is less than 0.01 mM, sufficient translation is achieved. This is because there is a tendency that the promoting ability is not recognized, and that if spermidine exceeds 1 OmM, it tends to inhibit the protein synthesis reaction. Further, in the reaction solution, it is preferable that calcium salt is added.
- the various calcium salts described above as components of the liquid for extraction can be preferably used.
- the calcium salt is added to the above-mentioned extraction solution.
- the reaction solution preferably contains 0.05 mM to 1 OmM, and more preferably 0.1 mM to 5 mM. That is, as a reaction solution using the extract obtained by the method of the present invention, the extract contains 30 (vZv)% to 60 (vZv)%, 20 mM to 300 mM potassium acetate, 0.5 mM to 5 mM magnesium acetate, 0.5 ml!
- TT5 mM DTT 0.1 mM-5 mM ATP, 0.05 mM-5 mM GTP, 10 mM-100 mM creatine phosphate, 10 ⁇ g Zm and 500 ⁇ g / mL creatine kinase, 10 ⁇ M ⁇ ⁇ 200 ⁇ amino acid component, 0.5 UZ ⁇ L ⁇ 1 OUZ ⁇ L RNase inhibitor, 10 ⁇ gZmL ⁇ 500 ⁇ gZmL tRNA, 10 gZmL ⁇ 500 ⁇ g mL foreign mRNA, 10 mM ⁇ 1 OOmM It is preferably realized to contain HEPES-KOH (pH 6-8.5).
- the present invention is further realized so as to further contain 0.05 mM to 5 mM spermidine and 0.1 mM to 5 mM calcium chloride in addition to the above.
- the cell-free protein synthesis reaction using the above reaction solution is performed in a conventionally known, for example, low-temperature constant temperature bath.
- the reaction temperature is usually in the range of 10 ° C to 40 ° C, preferably 20 ° C to 30 ° C. If the reaction temperature is lower than 10 ° C, the rate of protein synthesis tends to decrease, and if the reaction temperature exceeds 40 ° C, essential components tend to be denatured.
- the reaction time is generally 1 hour to 72 hours, preferably 3 hours to 24 hours.
- the heat retention time is usually in the range of 0 ° C to 50 ° C, preferably 15 ° C to 37 ° C. If the heat retention temperature is less than 0 ° C, the effect of heat retention will not be obtained, and if the heat retention temperature exceeds 50 ° C, essential components will tend to be denatured.
- the heat retention time is generally 1 minute to i 20 minutes, preferably 10 minutes to 60 minutes.
- the amount of the synthesized protein can be measured by measuring the activity of the enzyme, SDS-PAGE, immunoassay and the like.
- the protein that can be synthesized by the cell-free protein synthesis method of the present invention is not particularly limited.
- Reference Example 1 Culture of cultured mammalian cells (derived from lymphoma)
- the washing solution having the above composition was suspended in an extraction solution (cooled to 4 ° C.) prepared by adding 0.57 mL of 0.5 mM PMSF and 20% glycerol. This suspension was frozen rapidly (2 seconds) in liquid nitrogen. After thorough freezing, they were thawed in a water bath at about 10 ° C. After thawed completely, the mixture was centrifuged at 30,000 X g at 4 ° C for 10 minutes (himacCR20B3, manufactured by Hitachi, Ltd.) to remove the residue, and the supernatant was recovered. The resulting supernatant was further centrifuged (4 ° C, 30, OOO X g, 30 minutes), and the recovered supernatant was used as a mammalian cultured cell extract.
- Reference Example 2 Preparation of foreign mRNA
- pGEM-luc Vector (manufactured by Promega) 5 ng is a type I, and has a primer (Luc T7-F3-Kpn) having a base sequence shown in SEQ ID NO: 1 and a base sequence shown in SEQ ID NO: 2 in Sequence Listing Using a primer (Luc T7-R4-Kpn) and KODplus (manufactured by Toyobo Co., Ltd.), PCR was carried out for 30 cycles at 97 ° C 15 ° 55 ° C 30 ° 68 ° C1 20 °>. After purifying the DNA fragment by ethanolosole precipitation, it was digested with Kpnl.
- E. coli DH5 (Toyobo) was transformed.
- Plasmid DNA prepared from the transformed Escherichia coli by the alkaline SDS method was purified using a primer (T7 promoter) having the nucleotide sequence shown in SEQ ID NO: 3 and Big Dye Terminator Cycle Sequencing FS (manufactured by Applied Biosystems).
- T7 promoter the primer having the nucleotide sequence shown in SEQ ID NO: 3 and Big Dye Terminator Cycle Sequencing FS (manufactured by Applied Biosystems).
- a sequencing reaction 96 ° C. for 10 seconds, 50 ° C. for 5 seconds, 60 ° C. for 4 minutes, 30 cycles.
- This reaction solution was applied to an ABI PRISM 310 Genetic Analyzer (manufactured by Applied Biosystems) to analyze the nucleotide sequence.
- RQ1 RNase free DNase (promega) was added to 20 ⁇ L of the reaction solution after the transcription reaction, and the mixture was incubated at 37 ° C. for 15 minutes to digest type I DNA. After removing the protein by phenolic mouth-mouth extraction, potassium acetate was added to a final concentration of 0.3 M and ethanol precipitation was performed. The obtained precipitate was dissolved in 100 ⁇ L of sterile water, applied to a Nick Column (Amersham / Kyo Science), and eluted with 400 ⁇ of sterile water. Potassium acetate was added to a final concentration of 0.3 ⁇ , and ethanol precipitation was performed, and the amount of synthesized mRNA was determined by measuring the absorbance at 260 nm.
- luciferase atsushi kit E-1500, manufactured by Promega.
- reaction solution 2.5 ⁇ L was added to 50 ⁇ L of luciferase assay reagent, and luminescence by luciferase was measured using a luminometer (Tuner Designs TD-20Z20, manufactured by Promega).
- Mammalian cultured cells L51 78Y-S cultured in the same manner as in Reference Example 1 were washed with the same washing solution as in Example 1, and then suspended in the extraction solution cooled to 4 ° C as in Example 1. . Thereafter, the same operation as in Example 1 was performed except that extraction was performed with vigorous stirring for 5 minutes.
- the cell-free protein synthesis reaction was performed using the mRNA prepared in Reference Example 2 with the same reaction solution composition as in Experimental Example 1.
- luciferase was 10 ngZmL, which was about 1/50 of that of Experimental Example 1.
- Reference Example 3 Culture of mammalian cultured cells (CHO) Triangle containing 200 mL of Chinese hamster ovary cells CHO K1-SFM (purchased from Tohoku University Institute of Aging and Medicine, Medical Cell Resource Center) at a cell concentration of 4.9 10 5 cells / mL, CHO SERUM-FREE MEDIUM (SIGMA) in a flask (500mL) 130rpm ⁇ 37 ° C ⁇ 5% C0 2 atmosphere and incubated for 120 hours. As a result, the cell concentration was 8.8 ⁇ 10 6 cdls / m and the wet weight was 3.2 g.
- GHO mammalian cell
- the cultured animal cells cultured in Reference Example 3 above were collected by centrifugation (700 X g , 10 minutes), and washed three times with a washing buffer having the following composition (700 X g , 10 minutes). Centrifugation). (Composition of washing buffer)
- This cell suspension was rapidly frozen in liquid nitrogen. After sufficient freezing, they were thawed in an ice bath at about 4 ° C. After complete thawing, centrifuge at 4 ° C, 30000 X g for 10 minutes (himac CR20B3, manufactured by Hitachi, Ltd.) to remove cell debris, and the supernatant S1 was recovered. The resulting supernatant S1 was further centrifuged (4 ° C., 30,000 ⁇ g, 30 minutes), and then the supernatant S2 was recovered. The supernatant S2 was applied to PD-10 (manufactured by Amersham) equilibrated with a desalting buffer having the following composition.
- the fraction was eluted with a desalting buffer, and a fraction having an absorbance of 30 or more at 280 nm was collected using a spectrophotometer (Ultrospec3300pro, manufactured by Amersham Biosciences). GHO) extract.
- Example 1mM DTT 2 Cell-free protein synthesis using mammalian cell culture (GHO) extract
- the mammalian cultured cell (GHO) extract prepared in Example 2 was first mixed with components other than the exogenous mRNA in the reaction solution composition of the following composition, and incubated at 25 ° C. for 30 minutes. Then, the exogenous mRNA synthesized in Reference Example 2 was added, and protein synthesis was performed in a cell-free system.
- GHO mammalian cultured cell
- ATP (manufactured by Sigma), GTP (manufactured by Sigma), and amino acids (20 types) (manufactured by Sigma) were used, respectively.
- a low-temperature aluminum block thermostat MG-1000 was used as a reactor. The amount of the reaction solution was 25, the reaction temperature was 25 ° C., sampling was performed every reaction time, and the amount of the synthesized luciferase was measured. The synthesized luciferase was quantified using a luciferase assay kit (E-1500, manufactured by Promega).
- SEQ ID NO: 1 is a primer Luc T7-F3-Kpn
- SEQ ID NO: 2 is a primer Luc T7-R4-Kpn
- SEQ ID NO: 3 is a primer T7 promoter.
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04745964A EP1634947A4 (en) | 2003-06-10 | 2004-06-09 | EXTRACT FROM A CULTURED MAMMALIAN CELL, PROCESS FOR THEIR PREPARATION AND METHOD FOR CELL-FREE PROTEIN SYNTHESIS USING THE EXTRACT |
| JP2005506975A JP4389870B2 (ja) | 2003-06-10 | 2004-06-09 | 哺乳動物培養細胞抽出液を用いた無細胞系タンパク質合成方法 |
| US10/559,500 US20060141559A1 (en) | 2003-06-10 | 2004-06-09 | Extract from cultured mammalian cell, process for preparation thereof and method of cell-free protein synthesis using the extract |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-165390 | 2003-06-10 | ||
| JP2003165390 | 2003-06-10 |
Publications (1)
| Publication Number | Publication Date |
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| WO2004111203A1 true WO2004111203A1 (ja) | 2004-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/008422 Ceased WO2004111203A1 (ja) | 2003-06-10 | 2004-06-09 | 哺乳動物培養細胞抽出液およびその調製方法、ならびに該抽出液を用いた無細胞系タンパク質合成方法 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20060141559A1 (ja) |
| EP (1) | EP1634947A4 (ja) |
| JP (1) | JP4389870B2 (ja) |
| KR (1) | KR20060019589A (ja) |
| CN (1) | CN1806040A (ja) |
| WO (1) | WO2004111203A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106801047A (zh) * | 2016-12-30 | 2017-06-06 | 武汉金开瑞生物工程有限公司 | 一种通过无细胞蛋白合成系统制备半胱氨酸蛋白酶的方法 |
| WO2018198542A1 (ja) * | 2017-04-28 | 2018-11-01 | Spiber株式会社 | 無細胞タンパク質合成用反応混合物、これを用いた無細胞タンパク質合成方法、及び無細胞タンパク質合成用キット |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060211083A1 (en) * | 2005-01-21 | 2006-09-21 | Federico Katzen | Products and processes for in vitro synthesis of biomolecules |
| KR102560378B1 (ko) * | 2017-12-28 | 2023-07-26 | 강마-헬스코드 (상하이) 바이오테크 컴퍼니 리미티드 | 시험관 내 단백질 합성 시스템, 이의 키트 및 이의 제조 방법 |
| CN110577927A (zh) * | 2019-09-24 | 2019-12-17 | 山东甲骨文生物科技有限公司 | 一种从体外培养的细胞中提取细胞液的方法 |
| CA3155758A1 (en) * | 2019-10-25 | 2021-04-29 | Michael C. Jewett | Cell-free extract preparation protocol for enrichment of membrane vesicles and increased glycoprotein yields |
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| JP2000325076A (ja) * | 1999-05-21 | 2000-11-28 | Toshio Hara | 無細胞抽出液及び糖蛋白質合成系 |
| WO2001083805A2 (en) * | 2000-05-03 | 2001-11-08 | Novagen, Inc. | Improved e. coli extract for protein synthesis |
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| US5716985A (en) * | 1991-11-05 | 1998-02-10 | Smithkline Beecham Corporation | Endothelin receptor antagonists |
| US5543499A (en) * | 1993-10-29 | 1996-08-06 | Wake Forest University | DNA sequence encoding a polypeptide with anti-tumor properties |
| US6475725B1 (en) * | 1997-06-20 | 2002-11-05 | Baxter Aktiengesellschaft | Recombinant cell clones having increased stability and methods of making and using the same |
| AU2307599A (en) * | 1997-12-31 | 1999-07-19 | University Of Texas System, The | Improved telomerase extraction method |
| US6406921B1 (en) * | 1998-07-14 | 2002-06-18 | Zyomyx, Incorporated | Protein arrays for high-throughput screening |
| CA2364921A1 (en) * | 1999-02-22 | 2000-08-31 | European Molecular Biology Laboratory | Translation system |
| JP4061043B2 (ja) * | 2000-12-28 | 2008-03-12 | 株式会社ポストゲノム研究所 | invitro転写/翻訳系によるペプチド等の製造方法 |
| KR100399337B1 (ko) * | 2001-02-07 | 2003-09-26 | 드림바이오젠 주식회사 | 단백질의 무세포 번역후수식법 |
| US20020168706A1 (en) * | 2001-03-08 | 2002-11-14 | Invitrogen Corporation | Improved in vitro synthesis system |
| CA2437962C (en) * | 2001-03-16 | 2005-11-15 | Oncolytics Biotech Inc. | Method of extracting virus from cell culture |
| US8034581B2 (en) * | 2001-11-26 | 2011-10-11 | Toshio Hara | Cell-free extract and glycoprotein synthesis system |
| WO2004101805A1 (en) * | 2003-05-14 | 2004-11-25 | Axxima Pharmaceuticals Ag | Method for recombinant production of mammalian proteins and proteins obtainable by such method |
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2004
- 2004-06-09 JP JP2005506975A patent/JP4389870B2/ja not_active Expired - Lifetime
- 2004-06-09 KR KR1020057023753A patent/KR20060019589A/ko not_active Ceased
- 2004-06-09 EP EP04745964A patent/EP1634947A4/en not_active Withdrawn
- 2004-06-09 WO PCT/JP2004/008422 patent/WO2004111203A1/ja not_active Ceased
- 2004-06-09 US US10/559,500 patent/US20060141559A1/en not_active Abandoned
- 2004-06-09 CN CNA2004800162782A patent/CN1806040A/zh active Pending
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| JP2000325076A (ja) * | 1999-05-21 | 2000-11-28 | Toshio Hara | 無細胞抽出液及び糖蛋白質合成系 |
| WO2001083805A2 (en) * | 2000-05-03 | 2001-11-08 | Novagen, Inc. | Improved e. coli extract for protein synthesis |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106801047A (zh) * | 2016-12-30 | 2017-06-06 | 武汉金开瑞生物工程有限公司 | 一种通过无细胞蛋白合成系统制备半胱氨酸蛋白酶的方法 |
| WO2018198542A1 (ja) * | 2017-04-28 | 2018-11-01 | Spiber株式会社 | 無細胞タンパク質合成用反応混合物、これを用いた無細胞タンパク質合成方法、及び無細胞タンパク質合成用キット |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4389870B2 (ja) | 2009-12-24 |
| US20060141559A1 (en) | 2006-06-29 |
| CN1806040A (zh) | 2006-07-19 |
| KR20060019589A (ko) | 2006-03-03 |
| JPWO2004111203A1 (ja) | 2006-07-20 |
| EP1634947A1 (en) | 2006-03-15 |
| EP1634947A4 (en) | 2007-10-03 |
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