Studies on the oxidase activity of copper(II) carboxypeptidase A

Copper(II) carboxypeptidase A catalyses the oxidation of ascorbic acid and this reaction is inhibited by α-benzylsuccinate, a known inhibitor of the thiolesterase action of the copper enzyme; the pH dependencies of kcat and kcat/Km are similar near pH 7 to those seen for the peptidase and esterase activities of native carboxypeptidase A.