Selectively inhibits voltage-gated potassium channels Kv1.2/KCNA2 (IC(50)=183 nM). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). This toxin does not affect Kv1.1/KCNA1, Kv1.3/KCNA3, Kv1.4/KCNA4, Kv1.5/KCNA5 and Shaker IR. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 08 subfamily.