Binds with high affinity to muscular (alpha-1/CHRNA1) and neuronal (alpha-7/CHRNA7) nicotinic acetylcholine receptor (nAChR) and inhibits acetylcholine from binding to the receptor (By similarity), thereby impairing neuromuscular and neuronal transmission (PubMed:17906946). Expressed by the venom gland. Has the length of long neurotoxins, but only 4 disulfide bonds, as short neurotoxins. Belongs to the snake three-finger toxin family. Long-chain subfamily. Type II alpha-neurotoxin sub-subfamily.