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Protein Science, Vol 3, Issue 12 2226-2232, Copyright © 1994 by Cold Spring Harbor Laboratory Press

ARTICLE

Hydrogen exchange in BPTI variants that do not share a common disulfide bond

B. A. SCHULMAN and P. S. KIM
Howard Hughes Medical Institute, Whitehead Institute for Biomedical Research, Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142

Bovine pancreatic trypsin inhibitor (BPTI) is stabilized by 3 disulfide bonds, between cysteines 30-51, 5-55, and 14-38. To better understand the influence of disulfide bonds on local protein structure and dynamics, we have measured amide proton exchange rates in 2 folded variants of BPTI, [5-55](Ala) and [30-51; 14-38](V5A55), which share no common disulfide bonds. These proteins resemble disulfide-bonded intermediates that accumulate in the BPTI folding pathway. Essentially the same amide hydrogens are protected from exchange in both of the BPTI variants studied here as in native BPTI, demonstrating that the variants adopt fully folded, native-like structures in solution. However, the most highly protected amide protons in each variant differ, and are contained within the sequences of previously studied peptide models of related BPTI foldiing intermediates containing either the 5-55 or the 30-51 disulfide bond.
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