OmTx1 decreases the amplitude of the potassium current of the rat channels Kv1.1/KCNA1 by 17% and Kv1.2/KCNA2 by 12% as well as human Kv1.3/KCNA3 by 24%. OmTx2 decreases the amplitude of the potassium current of the rat channels Kv1.1/KCNA1 by 8% and Kv1.2/KCNA2 by 10% as well as human Kv1.3/KCNA3 by 36%. Also alters glucose-induced insulin release from pancreatic islets. Expressed by the venom gland. Has the structural arrangement of two alpha-helices stabilized by disulfide bonds (CSalpha/alpha 2(S-S)). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor kappa-KTx family. Kappa-KTx 2 subfamily.