Irreversibly blocks the A-type voltage-gated potassium channels in rat cerebellum granular cells (190 nM induce 50% inhibitory effect) (IC(50)=190 nM) (PubMed:15369825, PubMed:18280256). Also weakly inhibits Kv1.2/KCNA2 and Kv1.3/KCNA3 (PubMed:29483648). 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 block ERG1/Kv11.1/KCNH2 currents. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 15 subfamily.