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Table 1 Peptidoglycan structural variations in selected LAB and genes involved in PG synthesis or modification.

From: Cell wall structure and function in lactic acid bacteria

Peptidoglycan L. lactis
MG1363
L. casei
BL23
L. rhamnosus
GG
L. plantarum WCFS1
Cross-linking type L-Lys-D-Asp L-Lys-D-Asp L-Lys-D-Asp mDAP direct
Cross-linking index 35.5 % 34% 36.5 % 37.5%
   aslA gene + + + -
   racD gene + + + +
Fifth residue stem peptide D-Ala D-Lac D-Lac D-Lac
Acetylation of MurNAc 3.2 % 30 % 37 % 39 %
   oatA gene + + + +
Acetylation of GlcNAc no no no 9 %
   oatB gene - - - +
N-deacetylation of GlcNAc 9 % no no no
   pgdA gene + + + -
Amidation of D-Glu 100 % 100 % 100 % 100 %
   murT/gatD genes + + + +
Amidation of D-Asp 75% 100 % 100 % No D-Asp
   asnH gene + + + -
Amidation of mDAP No mDAP No mDAP No mDAP 100%
   asnB1 gene - - - +