Krait venom neurotoxin

Krait venom neurotoxins are a family of protein toxins found in the venom of kraits (Bungarus species), highly venomous snakes in the family Elapidae[4]. Notable types include α-bungarotoxin, κ-bungarotoxin (both "three-finger toxins" acting primarily on postsynaptic nicotinic acetylcholine receptors), and β-bungarotoxin (a heterodimeric toxin of phospholipase A2 and a Kunitz-type inhibitor, acting presynaptically)[1][4]. α- and κ-bungarotoxins bind to nAChRs, blocking synaptic transmission at the neuromuscular junction and within the nervous system; β-bungarotoxin targets voltage-sensitive potassium channels and disrupts acetylcholine release from presynaptic terminals[4]. These neurotoxins are the main drivers of the rapid-onset paralysis and potentially fatal respiratory effects observed in krait envenomation[1]. Their structure, actions, and ability to specifically affect neurotransmission at both muscular and neuronal synapses have made them important research tools in neurobiology but they are not considered traditional drug targets themselves—rather, they are the "active components" of envenomation for which antivenoms are developed[4][5].

Other names

Krait venom neurotoxinsBungarotoxinsα-bungarotoxinβ-bungarotoxinκ-bungarotoxin

Postsynaptic antagonism of nicotinic acetylcholine receptor (α-bungarotoxin, κ-bungarotoxin), Presynaptic inhibition of acetylcholine release (β-bungarotoxin via phospholipase A2 activity and binding to potassium channels)