Peptidoglycan glycosyltransferase
| peptidoglycan glycosyltransferase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 2.4.1.129 | ||||||||
| CAS no. | 79079-04-2 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
Peptidoglycan glycosyltransferase (EC 2.4.1.129) is an enzyme used in the biosynthesis of peptidoglycan. It transfers a disaccharide-peptide from a donor substrate to synthesize a glycan chain.[1]
This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is undecaprenyldiphospho-(N-acetyl-D-glucosaminyl-(1->4)-(N-acetyl-D-mu ramoylpentapeptide):undecaprenyldiphospho-(N-acetyl-D-glucosaminyl-( 1->4)-N-acetyl-D-muramoylpentapeptide) disaccharidetransferase. Other names in common use include PG-II, bactoprenyldiphospho-N-acetylmuramoyl-(N-acetyl-D-glucosaminyl)-, pentapeptide:peptidoglycan, N-acetylmuramoyl-N-acetyl-D-glucosaminyltransferase, penicillin binding protein (3 or 1B), and peptidoglycan transglycosylase.
Function
[edit]Peptidoglycan glycosyltransferase couples Lipid II subunits to synthesize the peptidoglycan chains. Transpeptidases crosslink the carbohydrate chains to provide the framework for the cell wall.[2]
It catalyzes the chemical reaction
- [GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)]n-diphosphoundecaprenol + GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)-diphosphoundecaprenol
- ⇌
- [GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)]n+1- diphosphoundecaprenol + undecaprenyl diphosphate
The 2 substrates of this enzyme are
- [GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)]n-diphosphoundecaprenol,
- GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)-diphosphoundecaprenol,
whereas its 2 products are
- [GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)]n+1-diphosphoundecaprenol, and
- undecaprenyl diphosphate.[3]
Structural studies
[edit]As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes 2BG1, 2UWX, and 2UWY.
References
[edit]- ^ Mesleh MF, Rajaratnam P, Conrad M, Chandrasekaran V, Liu CM, Pandya BA, et al. (February 2016). "Targeting Bacterial Cell Wall Peptidoglycan Synthesis by Inhibition of Glycosyltransferase Activity". Chemical Biology & Drug Design. 87 (2): 190–199. doi:10.1111/cbdd.12662. PMID 26358369.
- ^ Yuan Y, Barrett D, Zhang Y, Kahne D, Sliz P, Walker S (March 2007). "Crystal structure of a peptidoglycan glycosyltransferase suggests a model for processive glycan chain synthesis". Proceedings of the National Academy of Sciences of the United States of America. 104 (13): 5348–5353. doi:10.1073/pnas.0701160104. PMC 1817829. PMID 17360321.
- ^ "Information on EC 2.4.1.129 - peptidoglycan glycosyltransferase - BRENDA Enzyme Database". www.brenda-enzymes.org. Retrieved 2022-05-13.
