Damages membranes of susceptible bacteria. Has antibacterial activity against the Gram-positive bacteria B.megaterium and S.warneri. After 45 minutes of treatment with this protein, B.megaterium have no visible pili and are smooth. Has no antibacterial activity against the Gram-positive bacteria B.thuringiensis, S.aureus, S.clavuligerus and B. anthracis, or the Gram-negative bacteria E.coli and A.tumefaciens. Has no hemolytic activity. Does not inhibit the proteinases elastase and cathepsin G. Is not toxic to mice. Expressed by the venom gland. Belongs to the snake waprin family.