Common Krait long-chain three-finger alpha-neurotoxins (LαNTx)

Common Krait long-chain three-finger alpha-neurotoxins are a group of potent venom proteins produced by the snake Bungarus caeruleus. These toxins belong to the three-finger toxin (3FTx) superfamily and are characterized by a core of four or five disulfide bonds and three protruding loops. They function as competitive antagonists of nicotinic acetylcholine receptors (nAChRs) at the postsynaptic membrane of the neuromuscular junction. By binding with high affinity and slow reversibility to these receptors, they block the action of acetylcholine, leading to progressive muscle paralysis and potentially fatal respiratory failure. In the context of snakebite envenomation, these toxins are the primary targets for neutralization by polyvalent and monovalent antivenoms. Therapeutic challenges include the rapid onset of paralysis and the risk of hypersensitivity reactions to animal-derived antivenoms. These toxins are also valuable tools in neuroscience research for studying the structure and function of nAChRs.

Other names

Bungarus caeruleus alpha-neurotoxinsLong-chain alpha-neurotoxinsKappa-bungarotoxinsAlpha-delta-bungarotoxin-4Postsynaptic neurotoxins

Neutralization of toxin activity by antibody binding, preventing the toxin from occupying nicotinic acetylcholine receptors at the neuromuscular junction.