TABLE 3.

Peptidoglycan composition of cpx mutant strains

^aThe molar ratios of the different muropeptide structures were calculated for MC4100 or isogenic derivatives carrying a cpxR::spc, cpxA24, cpxA102, or cpxA711 allele, as previously described (26). The different muropeptide structures are abbreviated according to length, where M indicates a monomer, D indicates a cross-linked dimer, and T indicates a cross-linked trimer. The numbers indicate the length of the stem peptide, and the last letter indicates whether the muropeptide contains a DAP-DAP cross-link (D) or is anchored to Braun's lipoprotein (L) or if there is a 1,6-anhydro-muramic acid residue (N) or a glycine (G) at the end of the stem peptide. D-D/total is the ratio of DAP-DAP cross-links to the total cross-links. The averages of data from three measurements from biological replicates are shown. Shading indicates measurements that were different from the MC4100 value by 25%.