TOTAL CHEMICAL SYNTHESIS OF BOVINE PANCREATIC TRYPSIN-INHIBITOR BY NATIVE CHEMICAL LIGATION

Bovine pancreatic trypsin inhibitor (BPT1) is an important model for t he study of protein folding, Herein we describe a robust approach to t he total chemical synthesis of BPTI using native chemical ligation of unprotected peptide segments in aqueous solution. After refolding and oxidative formation of disulfides, the target protein was purified by affinity chromatography. The synthetic BPTI was characterized by mass spectrometry, inhibition assay, thermal denaturation and 2D NMR spectr oscopy, and was shown to be structurally and functionally identical to natural BPTI, The synthetic strategy presented in this paper has enab led us to establish rapid access to novel analogues of BPTI. (C) 1998 Federation of European Biochemical Societies.