Carboxypeptidase N from Pig Serum

Abstract
Carboxypeptidase N [EC 3.4.12.7] was purified 865-fold from pig serum. The enzyme has a MW of .apprx. 315,000. In the presence of dodecylsulfate and mercaptoethanol, it dissociates into 3 subunits of MW = 90,000, 50,000, 30,000, respectively. The native enzyme and the subunit of MW = 90,000 contain carbohydrate; no carbohydrate is found in the subunits of MW = 50,000 and 30,000. Trypsin [EC 3.4.21.4] transforms carboxypeptidase N into a form having a smaller molecular weight and enhanced activity.