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Accelerated exchange of a buried water molecule in selectively disulfide-reduced bovine pancreatic trypsin inhibitor.

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Author

Summary, in English

Using magnetic relaxation dispersion (MRD), we have previously shown that the four internal water molecules in bovine pancreatic trypsin inhibitor (BPTI) exchange with bulk water on time scales between 10(-8) and 10(-4) s at room temperature. Because this exchange is controlled by the protein structure, internal water molecules can be used to probe rare conformational fluctuations. Here, we report (2)H and (17)O MRD data at three temperatures for wild-type BPTI and two BPTI variants where the 14-38 disulfide bond has been cleaved by a double Cys --> Ser mutation or by disulfide reduction and carboxamidomethylation. The MRD data show that the internal water molecules are conserved on disulfide cleavage. However, the exchange rate of the water molecule buried near the disulfide bond is enhanced by 2-4 orders of magnitude. The relation of water exchange to other dynamic processes in BPTI is discussed.

Publishing year

2004

Language

English

Pages

12020-12027

Publication/Series

Biochemistry

Volume

43

Issue

38

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Biochemistry and Molecular Biology

Status

Published

ISBN/ISSN/Other

  • ISSN: 0006-2960