Scorpion venom phospholipase A2 (PLA2) that is lethal to crickets and crustaceae. Causes inflammation in mice and lysis of human erythrocytes. Has a mild anticoagulant effect on human platelets. 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. Optimum pH is 8.0. Less active at pH 5.0 and pH 10.0. Optimum temperature is 37 degrees Celsius. Less active at 25 degrees Celsius. Heterodimer composed of a small subunit and a large subunit; disulfide-linked. Expressed by the venom gland. Belongs to the phospholipase A2 family. Group III subfamily. Lacks one of the four calcium-binding sites found in other family members. It is uncertain whether Met-1 or Met-10 is the initiator.