Blocks small conductance calcium-activated potassium channels (KCNN, SK) (PubMed:9151979). Has also been shown to weakly inhibit Kv11.1/KCNH2/ERG1, Kv1.2/KCNA2, Kv1.3/KCNA3 and Kv2.1/KCNB1 voltage-gated potassium channels (PubMed:29483648). 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 1.85 ug/kg by intracerebroventricular injection into mice. Toxicity experiments on mutants are done without C-terminal amidation. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 05 subfamily.