Shows very weak blocking activity on voltage-gated potassium channels Kv10.1/KCNH1/EAG1 (6.2% inhibition by 40 uM of the toxin) (PubMed:27578329). Has no effect on the other voltage-gated potassium channels tested (PubMed:15670585). Monomer. Expressed by the venom gland. Has the structural arrangement of two alpha-helices stabilized by disulfide bonds (CSalpha/alpha 2(S-S)). Is not amidated. Has no effect on Kv1.1/KCNA1, Kv1.2/KCNA2 and Kv1.3/KCNA3 potassium channels, suggesting that the presence of an additional charged residue in a position adjacent to the dyad lysine impedes the functional block of Kv1 channels produced by this toxin. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor kappa-KTx family. Kappa-KTx 1 subfamily.