Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 6, Pages 1739-1742Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1417415112
Keywords
H/D exchange; quinary interactions; protein NMR; protein thermodynamics
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Funding
- National Science Foundation [MCB-1410854]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1410854] Funding Source: National Science Foundation
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Protein quinary interactions organize the cellular interior and its metabolism. Although the interactions stabilizing secondary, tertiary, and quaternary protein structure are well defined, details about the protein-matrix contacts that comprise quinary structure remain elusive. This gap exists because proteins function in the crowded cellular environment, but are traditionally studied in simple buffered solutions. We use NMR-detected H/D exchange to quantify quinary interactions between the B1 domain of protein G and the cytosol of Escherichia coli. We demonstrate that a surface mutation in this protein is 10-fold more destabilizing in cells than in buffer, a surprising result that firmly establishes the significance of quinary interactions. Remarkably, the energy involved in these interactions can be as large as the energies that stabilize specific protein complexes. These results will drive the critical task of implementing quinary structure into models for understanding the proteome.
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