Shows antibacterial activity against both Gram-positive bacteria (B.subtilis, M.luteus, E.faecalis) and Gram-negative bacteria (P.aeruginosa, Y.enterocolitica, A.calcoaceticus). Modifies membrane sodium permeability on Y.enterocolitica. Is toxic to mice, but is not to crabs. Induces concentration dependent haemolysis in human erythrocytes (PubMed:19540868). Acts by inhibiting the sodium (Nav) currents (By similarity). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Monoisotopic. Belongs to the long (4 C-C) scorpion toxin superfamily. Sodium channel inhibitor family. Beta subfamily.