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Title: Enhancing protein stability with extended disulfide bonds

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037,
  2. California Institute for Biomedical Research , La Jolla, CA 92037
  3. Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037,, California Institute for Biomedical Research , La Jolla, CA 92037

Significance This work describes a facile system for incorporating noncanonical amino acids containing long side-chain thiols using an expanded genetic code. These amino acids begin to overcome the distance and geometric constraints of the cysteine disulfide and can pair with cysteines to cross-link more remote sites in proteins. To demonstrate this notion, we constructed a library of random β-lactamase mutants containing these noncanonical amino acids and grew them at nonpermissive temperatures. We identified a mutant enzyme that is cross-linked by one such extended disulfide bond that has significantly enhanced thermal stability. This study suggests that an expanded set of amino acid building blocks can provide novel solutions to evolutionary challenges.

Research Organization:
Scripps Research Inst., La Jolla, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0011787
OSTI ID:
1252319
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 21 Vol. 113; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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