Voltage-gated potassium channel inhibitor. 1 uM of the native toxin inhibits rat Kv1.2/KCNA2 (100% inhibition), and drosophila Shaker IR/Sh (100%), human Kv1.3/KCNA3 (83%), rat Kv1.1/KCNA1 (32%) and rat Kv1.6/KCNA6 (21%). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Average mass. LD(50) is below 5 ug/kg by intracerebroventricular injection into mice. A rapid paralysis in the lower half of the body was observed a few minutes after the injection and after 10 min the animals died. Does not inhibit rKv1.4/ and the sodium channel rNav1.4/. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 31 subfamily.