IUBMB Enzyme Nomenclature


Accepted name: peptidoglycan glycosyltransferase

Reaction: [GlcNAc-(1→4)-Mur2Ac(oyl-L-Ala-γ-D-Glu-L-Lys-D-Ala-D-Ala)]n-diphosphoundecaprenol + GlcNAc-(1→4)-Mur2Ac(oyl-L-Ala-γ-D-Glu-L-Lys-D-Ala-D-Ala)-diphosphoundecaprenol = [GlcNAc-(1→4)-Mur2Ac(oyl-L-Ala-γ-D-Glu-L-Lys-D-Ala-D-Ala)]n+1-diphosphoundecaprenol + undecaprenyl diphosphate

For diagram click here.

Glossary: Mur2Ac = N-acetylmuramic acid

Other name(s): PG-II; bactoprenyldiphospho-N-acetylmuramoyl-(N-acetyl-D-glucosaminyl)-pentapeptide:peptidoglycan N-acetylmuramoyl-N-acetyl-D-glucosaminyltransferase; penicillin binding protein (3 or 1B); peptidoglycan transglycosylase; undecaprenyldiphospho-(N-acetyl-D-glucosaminyl-(1→4)-N-acetyl-D-muramoylpentapeptide):undecaprenyldiphospho-(N-acetyl-D-glucosaminyl-(1→4)-N-acetyl-D-muramoylpentapeptide) disaccharidetransferase

Systematic name: [poly-N-acetyl-D-glucosaminyl-(1→4)-(N-acetyl-D-muramoylpentapeptide)]-diphosphoundecaprenol:[N-acetyl-D-glucosaminyl-(1→4)-N-acetyl-D-muramoylpentapeptide]-diphosphoundecaprenol disaccharidetransferase

Comments: The enzyme also works when the lysine residue is replaced by meso-2,6-diaminoheptanedioate (meso-2,6-diaminopimelate, A2pm) combined with adjacent residues through its L-centre, as it is in Gram-negative and some Gram-positive organisms. The undecaprenol involved is ditrans,octacis-undecaprenol (for definitions, click here). Involved in the synthesis of cell-wall peptidoglycan.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 79079-04-2


1. Taku, A., Stuckey, M. and Fan, D.P. Purification of the peptidoglycan transglycosylase of Bacillus megaterium. J. Biol. Chem. 257 (1982) 5018-5022. [PMID: 6802846]

2. Goffin, C. and Ghuysen, J.-M. Multimodular penicillin-binding proteins: an enigmatic family of orthologs and paralogs. Microbiol. Mol. Biol. Rev. 62 (1998) 1079-1093. [PMID: 9841666]

3. van Heijenoort, J. Formation of the glycan chains in the synthesis of bacterial peptidoglycan. Glycobiology 11 (2001) 25R-36R. [PMID: 11320055]

[EC created 1984, modified 2002]

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