Composition of cell wall of Gram Positive bacteria

The cell wall of gram positive bacteria is thick about 25-30 nm.  It contain 20-80% of peptidoglycan. The cell wall is rigid and strong structure because the peptidoglycan are repeatedly cross linked .The cell wall of gram negative contain peptidoglycan ,protein  and polysaccharides. Beside these three ,the gram positive bacteria has fourth layer of carbohydrate molecules called Teichoic acid that are linked with muramic acid of peptidoglycan and bind the cell wall with plasmamembrane or cell membrane.The teichoic acid plays important role.It regulate the action of enzyme autolysin which lossen the bonds of peptidoglycan, It also regulate the normal cell division of gram positive bacteria.