Metallocarboxypeptidase D (EC 3.4.17.22, carboxypeptidase D (cattle, human, mouse, rat), gp180 (duck)) is an enzyme. This enzyme catalyses the following chemical reaction Metallocarboxypeptidase D (EC 3.4.17.22, carboxypeptidase D (cattle, human, mouse, rat), gp180 (duck)) is an enzyme. This enzyme catalyses the following chemical reaction This enzyme is activated by Co2+, and inhibited by guanidinoethylmercaptosuccinic acid.