Enhancing protein stability with extended disulfide bonds

Liu, Tao; Wang, Yan; Luo, Xiaozhou; Li, Jack; Reed, Sean A.; Xiao, Han; Young, Travis S.; Schultz, Peter G.

doi:10.1073/pnas.1605363113

Title: Enhancing protein stability with extended disulfide bonds

Journal Article · Mon May 09 00:00:00 EDT 2016 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1605363113· OSTI ID:1252319

Liu, Tao ^[1]; Wang, Yan ^[1]; Luo, Xiaozhou ^[1]; Li, Jack ^[1]; Reed, Sean A. ^[1]; Xiao, Han ^[1]; Young, Travis S. ^[2]; Schultz, Peter G. ^[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
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

Disulfide bonds play an important role in protein folding and stability. However, the cross-linking of sites within proteins by cysteine disulfides has significant distance and dihedral angle constraints. In this paper, we report the genetic encoding of noncanonical amino acids containing long side-chain thiols that are readily incorporated into both bacterial and mammalian proteins in good yields and with excellent fidelity. These amino acids can pair with cysteines to afford extended disulfide bonds and allow cross-linking of more distant sites and distinct domains of proteins. To demonstrate this notion, we preformed growth-based selection experiments at nonpermissive temperatures using a library of random β-lactamase mutants containing these noncanonical amino acids. A mutant enzyme that is cross-linked by one such extended disulfide bond and is stabilized by ~9 °C was identified. Finally, this result indicates that an expanded set of building blocks beyond the canonical 20 amino acids can lead to proteins with improved properties by unique mechanisms, distinct from those possible through conventional mutagenesis schemes.

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Research Organization:: Scripps Research Inst., La Jolla, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0011787

OSTI ID:: 1252319

Alternate ID(s):: OSTI ID: 1347591

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 Vol. 113 Journal Issue: 21; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 102 works

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