Snake venom three-finger toxins (3FTx)

Snake venom three-finger toxins (3FTxs) are a large and diverse family of non-enzymatic proteins found primarily in the venoms of elapid snakes (NIH, 2025; Wikipedia, 2022). They are characterized by a conserved structural scaffold of three beta-stranded loops extending from a central core stabilized by four or five disulfide bonds, resembling three fingers (VenomZone, 2023). Despite their structural similarity, 3FTxs target a wide array of receptors and ion channels, most notably nicotinic and muscarinic acetylcholine receptors (NIH, 2025). This interaction leads to post-synaptic neuromuscular paralysis, which is a hallmark of neurotoxic envenomation (NIH, 2020). They are the primary targets for antivenom therapy in neurotoxic snakebites (NIH, 2025). Beyond their role in pathology, 3FTxs serve as invaluable pharmacological tools for studying receptor function and are being explored as structural templates for the development of novel therapeutics for conditions such as chronic pain and cardiovascular disease (Biochemical Pharmacology, 2020). Their high specificity and stability make them attractive candidates for drug design, although their high sequence diversity presents a significant challenge for the development of universal antivenoms (NIH, 2025).

Other names

Three-finger toxinsTFTs3-finger toxinsSnake venom neurotoxinsCardiotoxinsCytotoxinsAlpha-neurotoxinsMuscarinic toxins

Neutralization of toxin activity by antibody binding, preventing interaction with physiological targets such as nicotinic acetylcholine receptors.