Exhibits high hydrolytic activities and shows strong preference for the anionic micelles (dPPC with deoxycholate) to the zwitterionic micelles (dPPC with Triton X-100). 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. Belongs to the phospholipase A2 family. Group II subfamily. D49 sub-subfamily. Sequence obtained after translation (DsM-b1) and sequence directly sequenced from protein (Dsm-b1', AA 17-27) correspond exactly. However, the mass found for the protein (14084) does not correspond to the expected mass calculated after translation (14055) (PubMed:17611171).