Imperatoxin A TFA is a peptide toxin derived from the venom of the African scorpion Pandinus imperator. Imperatoxin A TFA is a Ca2+-release channels/ryanodine receptors (RyRs) activator. Imperatoxin A TFA enhances the influx of Ca2+ from the sarcoplasmatic reticulum into the cell.
References:
[1]. Georgina B Gurrola, et al. Imperatoxin A, a Cell-Penetrating Peptide from Scorpion Venom, as a Probe of Ca2+-Release Channels/Ryanodine Receptors. Pharmaceuticals (Basel). 2010 Apr 1;3(4):1093-1107.