Inhibits Kv1.2/KCNA2 potassium channels. On glioma cells, may interact with chloride channels (probably Clc-3/CLCN3) and MMP2 at the surface of glioma cells. This complex may be then internalized via caveolae, thus inhibiting the chloride channels necessary for cell shrinkage and tumor propagation. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Belongs to the short scorpion toxin superfamily. Chloride channel inhibitor family.