Micrurus fulvius venom toxin proteins (MfVT)

Micrurus fulvius venom toxin proteins are a complex mixture of bioactive polypeptides secreted by the Eastern coral snake, primarily composed of three-finger toxins (3FTx) and phospholipase A2 (PLA2) enzymes (UniProt, 2024). The 3FTx components, particularly alpha-neurotoxins, act as potent antagonists at the nicotinic acetylcholine receptors (nAChR) of the neuromuscular junction, leading to post-synaptic blockade and potentially fatal respiratory paralysis (PubMed: PMC3500028). PLA2 enzymes in the venom contribute to toxicity through presynaptic neurotoxicity and localized myotoxicity by hydrolyzing membrane phospholipids (Toxicon, 2016). In a clinical context, these proteins are the direct targets of specific equine-derived antivenoms, which utilize polyclonal antibodies to sequester and neutralize the toxins before they can bind to host receptors. Because coral snake envenomation often presents with a significant delay between the bite and the onset of neurological symptoms, these toxin proteins represent a critical diagnostic and therapeutic focus for preventing irreversible neuromuscular failure.

Other names

Eastern coral snake venomMicrurus fulvius toxinsNorth American coral snake venom

The primary mechanism of action for drugs (antivenoms) targeting these proteins is passive immunization, where equine-derived IgG antibodies bind to and neutralize the circulating toxins, preventing them from interacting with their physiological targets such as nicotinic acetylcholine receptors (nAChR) (StatPearls, 2023; FDA Label: Antivenin Micrurus fulvius).