Carboxypeptidase B (EC 3.4.17.2 protaminase pancreatic carboxypeptidase B tissue carboxypeptidase B peptidyl-L-lysine [L-arginine]hydrolase) is a carboxypeptidase that preferentially acts upon basic amino acids such as arginine and lysine. This serum enzyme is also responsible for rapidly metabolizing the C5a protein into C5a des-Arg with one less amino acid.
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