Enhancing protein stability with extended disulfide bonds
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Scripps Research Inst., La Jolla, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1252319
- Alternate Identifier(s):
- OSTI ID: 1347591
- Grant/Contract Number:
- SC0011787
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 113 Journal Issue: 21; Journal ID: ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; noncanonical amino acids; extended disulfide bonds; β-lactamase; thermostability; evolutionary advantage
Citation Formats
Liu, Tao, Wang, Yan, Luo, Xiaozhou, Li, Jack, Reed, Sean A., Xiao, Han, Young, Travis S., and Schultz, Peter G. Enhancing protein stability with extended disulfide bonds. United States: N. p., 2016.
Web. doi:10.1073/pnas.1605363113.
Liu, Tao, Wang, Yan, Luo, Xiaozhou, Li, Jack, Reed, Sean A., Xiao, Han, Young, Travis S., & Schultz, Peter G. Enhancing protein stability with extended disulfide bonds. United States. https://doi.org/10.1073/pnas.1605363113
Liu, Tao, Wang, Yan, Luo, Xiaozhou, Li, Jack, Reed, Sean A., Xiao, Han, Young, Travis S., and Schultz, Peter G. Mon .
"Enhancing protein stability with extended disulfide bonds". United States. https://doi.org/10.1073/pnas.1605363113.
@article{osti_1252319,
title = {Enhancing protein stability with extended disulfide bonds},
author = {Liu, Tao and Wang, Yan and Luo, Xiaozhou and Li, Jack and Reed, Sean A. and Xiao, Han and Young, Travis S. and Schultz, Peter G.},
abstractNote = {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.},
doi = {10.1073/pnas.1605363113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 21,
volume = 113,
place = {United States},
year = {Mon May 09 00:00:00 EDT 2016},
month = {Mon May 09 00:00:00 EDT 2016}
}
https://doi.org/10.1073/pnas.1605363113
Web of Science
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