Binds and inhibits potassium channels. Intracerebroventricular injection into mice induces paralyzing symptoms followed by death. Its binding affinity to rat brain synaptosomes is 5-fold lower than this of KTX 1. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). LD(50) is 5.5 ug/kg by intracerebroventricular injection. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 03 subfamily.