Variables of the conformation of the active site of A-chymotrypsin. I. Hydrogen-ion concentration studies. II. Electrolyte concentration studies

摘要

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.The initial velocities of [alpha]-chymotrypsin-catalyzed hydrolyses of acylated amino acid esters follow the rate law [...] when the only variables are initial substrate and enzyme concentration. In the above equation, [...] is the initial velocity, [...] and [...] are initial enzyme and substrate concentration, respectively, and [...] and [...] are a pair of experimentally determined kinetic parameters. Factors such as temperature, ionic strength, hydrogen-ion concentration, structure of substrate, etc., affect the values of [...] and [...].Variation in the kinetic parameters [...],[...], and [...] for selected substrates and variations in the ratios of the parameters [...],[...]and [...] for selected pairs of substrates are studied as functions of hydrogen-ion concentration and concentration of added electrolyte.The results are discussed in terms of possible changes in conformation of the active site of [alpha]-chymotrypsin with changing hydrogenion concentration and concentration of added electrolyte.