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Mur ligase are a set of four Mur ubiquitin ligase enzymes: MurC, MurD, MurE, MurF which catalyze the addition of a short polypeptide to UDP-D-acetylmuramic acid in the process of bacterial cell wall buildup from peptidoglycans. All four enzymes are topologically similar. MurC ligase or UDP-N-acetylmuramoyl-L-alanine ligase adds L-alanine to peptidoglycans. MurD ligase or UDP-N-acetylmuramoyl-L-alanine:D-glutamate ligase catalyzes the conversion of UDP-N-acetylmuramoyl-L-alanine (UMA), D-glutamate and ATP to UDP-N-acetylmuramoyl-L-alanine-D-glutamate and ADP. I.e. adds D-glutamate to peptidoglycans. MurE ligase or UDP-N-acetylmuramoyl-L-alaninyl-D-glutamate-2,6-diaminopimelate ligase adds meso-diaminpimelate to peptidoglycans. MurF ligase or UDP-N-acetylmuramoyl-L-alanine-D-glutamyl-lysine-D-alanyl-D-alanine ligase adds D-alanyl-D-alanine to peptidoglycans.