Snake venom phospholipase A2 (PLA2) that inhibits neuromuscular transmission by blocking acetylcholine release from the nerve termini. Binds 1 Ca(2+) ion. Heterodimer of an acidic and a basic chain. The acidic subunit is non-toxic, without enzymatic activity and comprises 3 peptides that are cross-linked by 5 disulfide bridges. The basic subunit is toxic, has phospholipase A2 activity and is composed of a single chain. Expressed by the venom gland. Belongs to the phospholipase A2 family. Group II subfamily. D49 sub-subfamily.