Hainantoxin-III

Jingzhaotoxin-V is a peptide that inhibits potassium currents in Xenopus laevis oocytes with an IC50 value of 604.2 nM. Jingzhaotoxin-V also inhibits tetrodotoxin-resistant and tetrodotoxin-sensitive sodium currents in rat dorsal root ganglion neurons with IC50 values of 27.6 and 30.2 nM, respectively[1].

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[1]Yucheng Xiao, et al. Inhibition of neuronal tetrodotoxin-sensitive Na+ channels by two spider toxins: hainantoxin-III and hainantoxin-IV. Eur J Pharmacol. 2003 Sep 5;477(1):1-7.|[2]Yunxiao Zhang, et al. Engineering of highly potent and selective HNTX-III mutant against hNav1.7 sodium channel for treatment of pain. J Biol Chem. 2021 Jan-Jun:296:100326.