Voltage-gated potassium channel antagonist. Has a high potency on Kv1.3/KCNA3, and is moderately active on Kv1.1/KCNA1 (35% peak current inhibition at 3 uM of toxin) and on Shaker IR potassium channels (70% peak current inhibition at 3 uM of toxin). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Does not inhibit rKv1.1/KCNA1, rKv1.2/KCNA2, rKv1.4/KCNA4, rKv1.5/KCNA5, rKv1.6/KCNA6, hKv11.1/KCNH2 (when tested at 3 uM). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 08 subfamily.