Heterodimer: shows the same activities as the monomer, but with a lower potency. Monomer: snake venom phospholipase A2 (PLA2) that shows presynaptic neurotoxicity, anticoagulant activity and that weakly inhibits ADP-induced platelet aggregation (PubMed:18083205). Inhibits exocytosis in pancreatic beta cells, confirming it can act presynaptically in inhibiting the exocytosis of neurotransmitters in neurons (PubMed:19500614). 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. Enzymatic activity and neurotoxicity are inhibited by Triton X-100, which has been determined to be located in the center of the hydrophobic channel of the enzyme. Heterodimer; non-covalently linked. The toxic basic protein has phospholipase A2 activity (chain HDP-1P) and the non-toxic acidic protein functions as its inhibitor (chain HPD-1I (AC A4VBF0)). Expressed by the venom gland. Belongs to the phospholipase A2 family. Group II subfamily. D49 sub-subfamily.