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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

19F nuclear magnetic resonance studies of the interaction of inhibitors with chymotrypsin. Derivatives of tryptophan and phenylalanine

BC Nicholson and TM Spotswood

Australian Journal of Chemistry 31(10) 2167 - 2177
Published: 1978

Abstract

The binding of the inhibitors N-trifluoroacetyltryptophan, N- trifluoroacetylphenylalanine, N-acetyl-tryptophan and N- acetylphenylalanine to chymotrypsin has been studied by 19F N.M.R. spectroscopy at several pH values. Methods for determining the binding parameters, KI and ΔB, including a model for enzyme oligomerization and competitive inhibition from a second inhibitor, are discussed and a general non-linear least-squares method is presented. Values of KI and ΔB are recorded for D and L enantiomers of tryptophan derivatives and for D-phenylalanine derivatives. The results are discussed in terms of a model for the aromatic binding site of chymotrypsin.

https://doi.org/10.1071/CH9782167

© CSIRO 1978

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