Tamapin TFA is a venom peptide, targeting to small conductance Ca(2+)-activated K(+) (SK) channels. Tamapin TFA is a selctive blocker of SK2 (Potassium Channel). Tamapin TFA inhibits SK channel-mediated currents in pyramidal neurons of the hippocampus. Tamapin TFA can be isolated from the Indian red scorpion (Mesobuthus tamulus).
References:
[1]. Pedarzani P, et al. Tamapin, a venom peptide from the Indian red scorpion (Mesobuthus tamulus) that targets small conductance Ca2+-activated K+ channels and afterperpolarization currents in central neurons. J Biol Chem. 2002 Nov 29;277(48):46101-9.