Voziyan PA, Jadhav L, Fisher MT. Refolding a glutamine synthetase truncation mutant in vitro: identifying superior conditions using a combination of chaperonins and osmolytes.
J Pharm Sci 2000;
89:1036-45. [PMID:
10906727 DOI:
10.1002/1520-6017(200008)89:8<1036::aid-jps8>3.0.co;2-5]
[Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A new method that uses a combination of bacterial GroE chaperonins and cellular osmolytes for in vitro protein folding is described. With this method, one can form stable chaperonin-protein folding intermediate complexes to prevent deleterious protein aggregation and, using these complexes, screen a large array of osmolyte solutions to rapidly identify the superior folding conditions. As a test substrate, we used GSDelta468, a truncation mutant of bacterial glutamine synthetase (GS) that cannot be refolded to significant yields in vitro with either chaperones or osmolytes alone. When our chaperonin/osmolyte method was employed to identify and optimize GSDelta468 refolding conditions, 67% of enzyme activity was recovered, comparable with refolding yields of wild type GS. This method can potentially be applied to the refolding of a broad spectrum of proteins.
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