Accessible Requires Authentication Published by De Gruyter August 8, 2005

Kinetics of autocatalytic zymogen activation measured by a coupled reaction: pepsinogen autoactivation

Matilde-Esther Fuentes, Ramón Varón, Manuela García-Moreno and Edelmira Valero
From the journal

Abstract

A kinetic study was performed of a model for an autocatalytic zymogen activation process involving both intra- and intermolecular routes, to which a chromogenic reaction in which the active enzyme acts upon one of its substrates was coupled to continuously monitor the reaction. Kinetic equations describing the evolution of species involved in the system with time were obtained. These equations are valid for any zymogen autocatalytic activation process under the same initial conditions. Experimental design and kinetic data analysis procedures to evaluate the kinetic parameters, based on the derived kinetic equations, are suggested. In addition, a dimensionless distribution coefficient was defined, which shows mathematically whether the intra- or the intermolecular route prevails once the kinetic parameters involved in the system are known. The validity of the results obtained was checked using simulated curves for the species involved. As an example of application of the method, the system is experimentally illustrated by the continuous monitoring of pepsinogen transformation to pepsin.

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Published Online: 2005-08-08
Published in Print: 2005-07-01

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