Phrixotoxin 3-NH2 TFA is a derivative of Phrixotoxin 3 TFA . Phrixotoxin 3 TFA is a potent blocker of voltage-gated sodium channels, with IC50s of 0.6, 42, 72, 288, 610 nM for NaV1.2, NaV1.3, NaV1.4, NaV1.1 and NaV1.5, respectively. Phrixotoxin 3 TFA modulates voltage-gated sodium channels with properties similar to those of typical gating-modifier toxins, both by causing a depolarizing shift in gating kinetics and by blocking the inward component of the sodium current.
References:
[1]. Bosmans F, et, al. Four novel tarantula toxins as selective modulators of voltage-gated sodium channel subtypes. Comparative Study Mol Pharmacol. 2006 Feb; 69(2): 419-29.