Binding of the Ile-Val and Val-Val effector dipeptides to the binary adducts of bovine trypsinogen with kunitz and kazal inhibitors as well as the acylating agent p-nitrophenyl p-guanidinobenzoate. A thermodynamic and kinetic study

Paolo Ascenzi, Gino Amiconi, Martino Bolognesi, Enea Menegatti, Mario Guarneri

Research output: Contribution to journalArticlepeer-review

Abstract

Thermodynamics and kinetics of binding of the Ile-Val and Val-Val effector dipeptides to the binary adducts of bovine trypsinogen with the bovine basic pancreatic trypsin inhibitor (BPTI, Kunitz inhibitor), the porcine pancreatic secretory inhibitor (PSTI, Kazal inhibitor) and the acylating agent p-nitrophenyl p-guanidinobenzoate have been investigated at pH 7.4 and 21(±0.5) °C. The affinity of both effector dipeptides for bovine trypsinogen: BPTI and bovine trypsinogen: PSTI binary adducts is higher than that observed for the formation of the dipeptide: bovine trypsinogen: p-guanidinobenzoate ternary complexes; moreover, the affinity of Ile-Val for the zymogen binary adducts is higher than that observed for Val-Val association. Binding of Ile-Val and Val-Val to the bovine trypsinogen binary complexes conforms to the induced-fit model, which consists of a fast pre-equilibrium followed by intramolecular isomerization change(s), the latter representing the rate-limiting first-order process. For the three bovine trypsinogen systems considered, the rate of the intramolecular isomerization change(s) is essentially independent of the nature of the dipeptide and of the proenzyme binary complex.

Original languageEnglish
Pages (from-to)751-754
Number of pages4
JournalJournal of Molecular Biology
Volume194
Issue number4
DOIs
Publication statusPublished - Apr 20 1987

ASJC Scopus subject areas

  • Virology

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