Binds with high affinity to muscular nicotinic acetylcholine receptors (nAChRs) (tested on Torpedo marmorata AChR, Kd=0.07 nM) and with low affinity to neuronal alpha-7/CHRNA7 nAChRs (tested on chimeric receptor, Kd=3 uM) and inhibit acetylcholine from binding to the receptor, thereby impairing neuromuscular transmission (PubMed:9305882). Produces peripheral paralysis by blocking neuromuscular transmission at the postsynaptic site. Expressed by the venom gland. LD(50) is 0.036 mg/kg by subcutaneous injection. Belongs to the snake three-finger toxin family. Short-chain subfamily. Type I alpha-neurotoxin sub-subfamily. The venom of this snake was originally thought to be that of N.nigricollis.