Selective inhibitor of high conductance calcium-activated potassium channels KCa1.1/KCNMA1. May be insect specific. Monomer. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Has no effect on voltage-gated potassium channels Kv1.1/KCNA1, Kv1.2/KCNA2, Kv1.3/KCNA3, Kv11.1/KCNH2, Kv11.2/KCNH6, Kv11.3/KCNH7, Kv7.1/KCNQ1 and on Kir2.1/KCNJ2. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 19 subfamily.