Human serum α1‐antichymotrypsin is an inhibitor of pancreatic elastases
- 1 September 1985
- journal article
- research article
- Published by Wiley in European Journal of Biochemistry
- Vol. 151 (2), 327-331
- https://doi.org/10.1111/j.1432-1033.1985.tb09104.x
Abstract
Incubation of human serum α1‐antichymotrypsin with human pancreatic elastase 2 or porcine pancreatic elastase results in the complete inhibition of each enzyme as determined by spectrophotometric assays. α1‐Antichymotrypsin reacts much more rapidly with the human than with the porcine enzyme. The inhibitor:enzyme molar ratio, required to obtain full inhibition of enzymatic activity, is equal to 1.25/1 when α1‐antichymotrypsin reacts with human pancreatic elastase 2 while it is markedly higher with porcine pancreatic elastase (5.5/1). Patterns obtained by SDS/polyacrylamide gel electrophoresis of the reaction products show the formation with both enzymes of an equimolar complex (Mr near 77000) and the release of a fragment migrating as a peptide of Mr near 5000. Moreover a free proteolytically modified form of α1‐antichymotrypsin, electrophoretically identical with that obtained in the reaction with cathepsin G or bovine chymotrypsin, is produced in the reaction with each elastase but in a much greater amount when α1‐antichymotrypsin reacts with porcine elastase than with human elastase. As a consequence of our findings, the specificity of α1‐antichymotrypsin, so far limited to the inhibition of chymotrypsin‐like enzymes from pancreas and leukocyte origin, has to be extended to the two pancreatic elastases investigated in this work. A contribution of α1‐antichymotrypsin to the regulatory balance between plasma inhibitors and human pancreatic elastase 2 in pancreatic diseases is suggested.This publication has 23 references indexed in Scilit:
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