Blocks the voltage-gated potassium channel Kv1.3/KCNA3 (IC(50)=7.2 nM) (PubMed:18471844, PubMed:29483648). Correnti and colleagues have also shown that this toxin inhibits Kv1.1/KCNA1, which is different from Abdel-Mottaleb and colleagues conclusions (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). Has no activity on Kv1.1/KCNA1, Kv1.2/KCNA2, Kv1.4/KCNA4, Kv1.5/ KCNA5, Kv1.6/KCNA6, Shaker/Sh and human Kv11.1/KCNH2. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 03 subfamily.