Has chymotrypsin-type protease activity and hypocalcemic activity. Preferential cleavage: Leu-|-Xaa, Tyr-|-Xaa, Phe-|-Xaa, Met-|-Xaa, Trp-|-Xaa, Gln-|-Xaa, Asn-|-Xaa. Monomer. The zymogen is secreted as a ternary complex composed of procarboxypeptidase A, chymotrypsinogen C and proproteinase E. Pancreas. Belongs to the peptidase S1 family. Elastase subfamily.