Metalloprotease involved in the inhibition of insect antibacterial peptides. Reduces the antibacterial activity of G.mellonella hemolymph by 50%. Reduces the antibacterial activity of cecropin A by 80% and completely inhibits cecropin B. Binds 1 zinc ion per subunit. Inhibited by 8 mM 1,10-phenanthroline, but not by EDTA or PMSF. Optimum pH is 7.0. Optimum temperature is 50 degrees Celsius. Active from 10 to 80 degrees Celsius. Belongs to the peptidase M4 family.