:Muramoyltetrapeptide carboxypeptidase

{{Infobox enzyme

| Name = Muramoyltetrapeptide carboxypeptidase

| EC_number = 3.4.17.13

| CAS_number = 60063-80-1

| GO_code =

| image =

| width =

| caption =

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Muramoyltetrapeptide carboxypeptidase ({{EC number|3.4.17.13}}, carboxypeptidase IIW, carboxypeptidase II, lysyl-D-alanine carboxypeptidase, L-lysyl-D-alanine carboxypeptidase, LD-carboxypeptidase) is an enzyme.{{cite journal | vauthors = DasGupta H, Fan DP | title = Purification and characterization of a carboxypeptidase-transpeptidase of Bacillus megaterium acting on the tetrapeptide moiety of the peptidoglycan | journal = The Journal of Biological Chemistry | volume = 254 | issue = 13 | pages = 5672–83 | date = July 1979 | pmid = 109439 }}{{cite journal | vauthors = Rousset A, Nguyen-Distèche M, Minck R, Ghuysen JM | title = Penicillin-binding proteins and carboxypeptidase/transpeptidase activities in Proteus vulgaris P18 and its penicillin-induced stable L-forms | journal = Journal of Bacteriology | volume = 152 | issue = 3 | pages = 1042–8 | date = December 1982 | pmid = 6754695 | pmc = 221607 }}{{cite journal | vauthors = Metz R, Henning S, Hammes WP | title = LD-carboxypeptidase activity in Escherichia coli. II. Isolation, purification and characterization of the enzyme from E. coli K 12 | journal = Archives of Microbiology | volume = 144 | issue = 2 | pages = 181–6 | date = March 1986 | pmid = 3521530 | doi = 10.1007/bf00414732 }} This enzyme catalyses the following chemical reaction

: Hydrolysis of the bond: N-acetyl-D-glucosaminyl-N-acetylmuramoyl-L-Ala-D-glutamyl-6-carboxy-L-lysyl--D-alanine

Variants are known from various microorganisms.