Phospholipase toxin, which may catalyze the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. Inhibits both skeletal (RYR1) and cardiac (RYR2) ryanodine receptors (calcium release channels). Probably blocks ryanodine receptors by generating a lipid product. 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. Heterodimer composed of a large subunit and a small subunit; disulfide-linked. Expressed by the venom gland. Belongs to the phospholipase A2 family. Group III subfamily. In contrast to other phospholipases, it lacks the typical Asp active site (Asp->Glu in position 93).