Recombinant toxin that reversibly inhibits the potassium current of mKv1.3/KCNA3 channel stably expressed in COS7 cells (IC(50)=150 nM) (PubMed:17624312). Also shows a weak inhibition on Kv1.2/KCNA2, Kv1.3/KCNA3 and TRPV1 channels (PubMed:29483648). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Does not inhibit large conductance calcium-activated potassium channels (BK). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 26 subfamily.