Voltage-gated potassium channel inhibitor (Kv) that acts on Kv1.3/KCNA3 and Kv7.1/KCNQ1. 1 uM of the toxin inhibits Kv1.3/KCNA3 currents by 35.1%, whereas 10 uM of the toxin inhibits Kv7.1/KCNQ1 currents by 44.9%. Expressed by the venom gland. Has the structural arrangement of two alpha-helices stabilized by disulfide bonds (CSalpha/alpha 2(S-S)). Does not show activity on ion channels KCa2.3/KCNN3, TRPV1, and KCa1.1/KCNMA1. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor kappa-KTx family. Kappa-KTx 2 subfamily.