Androctonus australis hector venom neurotoxins (Aah toxins)

Androctonus australis hector (Aah) venom neurotoxins are a group of highly potent peptides produced by the North African fat-tailed scorpion, which are responsible for severe and often fatal envenomation in humans (PubMed: 11518353). These toxins primarily target voltage-gated sodium (Nav) channels, with the most lethal component, Aah II, acting as an alpha-toxin that binds to receptor site 3 (UniProt: P01484). By binding to this site, the toxins inhibit the inactivation of the sodium channel, leading to prolonged action potentials and a massive release of neurotransmitters, which triggers a life-threatening autonomic storm (PubMed: 10657230). Clinical manifestations include hypertension, pulmonary edema, and cardiovascular collapse, making these toxins a major public health concern in endemic regions (PubMed: 15649515). While they are not therapeutic targets in the traditional sense, they are the primary focus for the development of antivenoms and serve as essential pharmacological tools for studying ion channel physiology (PubMed: 12126521).

Other names

AahIAahIIAahIIIAahIVAah ITAlpha-mammal toxins from Androctonus australisScorpion venom neurotoxins

The neurotoxins bind to specific sites on voltage-gated sodium channels; alpha-toxins bind to site 3 to inhibit inactivation, while beta-toxins bind to site 4 to shift the voltage-dependence of activation, both leading to prolonged depolarization and repetitive firing of neurons (PubMed: 10657230).