Weakly inhibits the vertebrate potassium channel Kv1.1/KCNA1. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Does not inhibit the vertebrate potassium channel Kv1.3/KCNA3. This toxin is a weak beta toxin because it has no effect on Nav1.2a/SCN2A voltage-dependent sodium channels when perfused at a concentration of 100 nM, but when added to the extracellular bath solution at a concentration of 1 uM it shifts the voltage of activation toward more negative potentials. Has no effect on the Nav1.5/SCN5A voltage-dependent sodium channel. Administration to mice produces no toxic effects (PubMed:15656785). Belongs to the long (3 C-C) scorpion toxin superfamily. Sodium/Potassium channel inhibitor family.