title: Kinetic studies of carboxypeptidase Y. I. Kinetic parameters for the hydrolysis of synthetic substrates.
abstract: Kinetic parameters for carboxypeptidase Y [EC 3.4.12.1], characterized as a nonspecific enzyme, are given for the hydrolysis of a series of acylated peptides, acylated amino acid esters, and amides. We confirmed that the enzyme released COOH-terminal proline and beta-alanine at an appreciable rate, as well as neutral amino acids with aromatic and aliphatic side chains at a very high speed. The rates of hydrolysis of ester and amide substrates were compatible with those produced by chymotrypsin [EC 3.4.21.1]. Stereospecificity was also demonstrated by the failure to hydrolyze peptide, ester, amide, and anilide substrates containing a D-amino acid. The effects of pH, solvents, and salt concentrations on the kinetic parameters of hydrolysis of peptide and ester substrates are also described.
mesh_terms: D000813:Anilides; D001593:Benzyl Compounds; D002268:Carboxypeptidases / Q000378:metabolism*; D004151:Dipeptides; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009842:Oligopeptides; D009994:Osmolar Concentration; D010636:Phenols; D011189:Potassium Chloride / Q000494:pharmacology; D012441:Saccharomyces cerevisiae / Q000201:enzymology; D013329:Structure-Activity Relationship
chemical_list: D000813:Anilides; D001593:Benzyl Compounds; D004151:Dipeptides; D009842:Oligopeptides; D010636:Phenols; D011189:Potassium Chloride; D002268:Carboxypeptidases