Lysozyme is an enzyme that defends your body against bacterial invaders in fluids like tears, mucus, breast milk, and saliva. Lysozyme cleaves the peptidoglycan component of the bacterial cell wall, resulting in the death of the bacterium. Peptidoglycan is made of long polysaccharide chains linked to each other by peptides. The active site of lysozyme binds to six sugar residues, labeled A through F, and breaks the ?1-4 glycosidic bond between the D and E rings.
