Blocks potassium channels Shaker-IR (with inactivation domain removed) and hKv1.2/KCNA2. Expressed by the venom gland. Has the structural arrangement of two alpha-helices stabilized by disulfide bonds (CSalpha/alpha 3(S-S)). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 20 subfamily. The sequence aligns with alpha-KTx but has the CSalpha/alpha scaffold of a kappa-KTx due to the unusual pattern of disulfide bonds. As is the method of choice in UniProtKB, the assignment to the alpha-KTx 20 subfamily is based purely on the primary structure.