Binds to muscle nicotinic acetylcholine receptor (nAChR) and inhibit acetylcholine from binding to the receptor, thereby impairing neuromuscular transmission. Expressed by the venom gland. Does not inhibit GABA(A) channel composed of alpha-1-beta-3-gamma-2 (GABRA1-GABRB3-GABRG2) subunits. Belongs to the snake three-finger toxin family. Short-chain subfamily. Type I alpha-neurotoxin sub-subfamily.