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Spider neurotoxins including agatoxin, purotoxin and ctenitoxin This domain family contains spider toxins that include the omega-Aga-IVB, a P-type calcium channel antagonist from venom of the funnel web spider, Agelenopsis aperta, as well as purotoxin-1 (PT1), a spider peptide venom of the Central Asian spider Geolycosa sp., which specifically exerts inhibitory action on P2X3 purinoreceptors at nanomolar concentrations. These spider toxins, which are ion channel blockers, share a common structural motif composed of a triple-stranded antiparallel beta-sheet, stabilized by internal disulfide bonds known as cystine knots. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",