PLA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion. Expressed by the venom gland. Contains 6 disulfide bonds. Two very similar relatively non-toxic phospholipases were isolated from the venom, CM-II (shown here) and CM-I. The amino acid composition of CM-I differed from that of CM-II in having 1 more Thr and Ala and one fewer Ser and Lys. Belongs to the phospholipase A2 family. Group II subfamily. D49 sub-subfamily.