Reversibly blocks voltage-gated potassium channels (Kv1.1/KCNA1 (Kd=79 uM), Kv1.2/KCNA2 (Kd=547 nM) and Kv1.3/KCNA3 (Kd=492 nM)). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Does not inhibit ERG1/Kv11.1/KCNH2 potassium channels. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 01 subfamily.