Enhancedin vitrosynthesis of active proteins containing disulfide bonds
First Claim
1. A method for in vitro synthesis of properly folded polypeptides comprising at least one disulfide bond, in a reaction mix comprising a biological extract comprising components of polypeptide synthesis machinery, wherein such components are capable of expressing a nucleic acid encoding a desired polypeptide, the method comprising:
- synthesizing said polypeptide in a reaction mix wherein the biological extract has been pre-treated with a sulfhydryl inactivating agent that irreversibly inactivates free sulfhydryl groups;
isolating said polypeptide from said reaction mixture, wherein the amount of said polypeptide that is properly folded is enhanced relative to polypeptide synthesized in the absence of pretreatment with said sulfhydryl inactivating agent.
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Abstract
Compositions and methods are provided for the enhanced in vitro synthesis of polypeptides containing disulfide bonds. In order to improve the performance of in vitro protein synthesis reactions, pre-treatment and redox buffering of the reaction mix is performed in order to optimize the redox potential. Exogenous enzymes that enhance protein folding and disulfide bond formation may also be added to the reaction.
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Citations
23 Claims
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1. A method for in vitro synthesis of properly folded polypeptides comprising at least one disulfide bond, in a reaction mix comprising a biological extract comprising components of polypeptide synthesis machinery, wherein such components are capable of expressing a nucleic acid encoding a desired polypeptide, the method comprising:
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synthesizing said polypeptide in a reaction mix wherein the biological extract has been pre-treated with a sulfhydryl inactivating agent that irreversibly inactivates free sulfhydryl groups; isolating said polypeptide from said reaction mixture, wherein the amount of said polypeptide that is properly folded is enhanced relative to polypeptide synthesized in the absence of pretreatment with said sulfhydryl inactivating agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for optimizing the in vitro synthesis of a properly folded polypeptide comprising at least one disulfide bond, in a plurality of reaction mixtures comprising a biological extract comprising components of polypeptide synthesis machinery, wherein such components are capable of expressing a nucleic acid encoding a desired polypeptide the method comprising:
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varying at least one of;
the concentration of a foldase or chaperonin, a redox buffer, and temperature, in a plurality of reaction mixtures, wherein the biological extract has been pre-treated with a sulfhydryl inactivating agent that irreversibly inactivates free sulfhydryl groups;synthesizing said polypeptide in said plurality of reaction mixtures; quantitating the amount of properly folded polypeptide synthesized in each of said reaction mixtures; determining which of said plurality of reaction mixtures provides for an optimized yield of properly folded polypeptide. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification