Bungarus candidus neurotoxin

Bungarus candidus neurotoxins are a group of potent toxic proteins found in the venom of the Malayan krait, a snake species native to Southeast Asia that is responsible for significant morbidity and mortality (WHO Snakebite Database). These toxins primarily target the neuromuscular junction, where they disrupt cholinergic transmission to cause systemic muscle paralysis. The venom contains several classes of toxins, most notably three-finger toxins (3FTxs) like candoxin, which acts as a reversible antagonist at nicotinic acetylcholine receptors (nAChRs), and bucandin (UniProt: P81783, P81030). Additionally, the venom includes pre-synaptic beta-neurotoxins with phospholipase A2 activity that can cause irreversible damage to motor nerve terminals, leading to prolonged paralysis (PubMed: 12130650). Clinically, envenomation often presents with minimal local symptoms but progresses rapidly to ptosis and fatal respiratory failure. The primary treatment is the administration of specific antivenoms, which utilize purified antibodies to neutralize the toxins before they can bind to their physiological targets. Due to the rapid action and potential irreversibility of some components, early antivenom administration and access to mechanical ventilation are critical for patient survival.

Other names

Malayan krait neurotoxinCandoxinBucandinBungarus candidus alpha-neurotoxinBungarus candidus beta-neurotoxin

Antibody-mediated neutralization of toxin activity by binding to the toxin and preventing its interaction with host receptors such as the nicotinic acetylcholine receptor.