Cell wall. Common peptidoglycan ayer o A backbone of N-acetyl glucosamine and N-acetylmuramic acid: Both discovered in grampositive and Gram negative bacteria. o A set of identical tetrapeptide side chain attached to N-acetyl-muramic acid: different components and binding modes in gram positive and Gram negative bacteria o A set ofidentical peptide cross bridges: only in grampositive bacteria NAM NAG CH,OH CH2OH CHOH H H OH OH H1C、点NHH H,C C-H O=C C=9..H3 Gly-Gly-Gly-Gly-Gly ly-Gly-Gly-Gly-GlyCell wall :Common peptidoglycan layer ⚫ A backbone of N-acetyl glucosamine and N-acetylmuramic acid: Both discovered in Grampositive and Gramnegative bacteria. ⚫ A set of identical tetrapeptide side chain attached to N-acetyl-muramic acid: different components and binding modes in Gram positive and Gram negative bacteria. ⚫ A set of identical peptide cross bridges: only in Gram positive bacteria