Voltage-independently blocks potassium currents on hKv1.1/KCNA1 (IC(50)=217 uM), and hKv1.4/KCNA4 (IC(50)=71 uM) (expressed in CHO cells). Expressed by the venom gland. Has the structural arrangement of two alpha-helices stabilized by disulfide bonds (CSalpha/alpha 2(S-S)). Monoisotopic mass. Has no effect on other potassium channels, on sodium channels, on bacterial growth and on smooth muscle tissue (a known assay to identify possible bradykinin-potentiating peptides). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor kappa-KTx family. Kappa-KTx 2 subfamily.