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Structure of E. coli peptidoglycan. (A) Glycan chain with monomer peptide subunits. (B) PG dimer with the d-Ala→(d)-meso-A2pm cross-linkage. (C) PG dimer with the (l)-meso-A2pm→(d)-meso-A2pm cross-linkage. (D) Tripeptide subunit with linked Lpp lipoprotein. Abbreviations: G, N-acetyl-β-d-glucosamine (GlcNAc); M, N-acetyl-β-d-muramic acid (MurNAc); red C, carbon of the d-configuration; →, CO-NH linkage.
