Has bacteriolytic activity against M.luteus. Hydrolysis of (1->4)-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in a peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrins. Shows preference for N-acetylmuramic acid residues that are substituted with a peptide moiety. It acts only as a glycanohydrolase. Belongs to the glycosyl hydrolase 23 family.