Enables carboxypeptidase activity. Involved in bradykinin catabolic process; proteolysis; and response to glucocorticoid. Located in extracellular space. Human ortholog(s) of this gene implicated in carboxypeptidase N deficiency. Orthologous to human CPN1 (carboxypeptidase N subunit 1). [provided by Alliance of Genome Resources, Apr 2022]