| EC |
2.4.1.174 |
| Accepted name: |
glucuronylgalactosylproteoglycan 4-β-N-acetylgalactosaminyltransferase |
| Reaction: |
UDP-N-acetyl-α-D-galactosamine + [protein]-3-O-(β-D-GlcA-(1→3)-β-D-Gal-(1→3)-β-D-Gal-(1→4)-β-D-Xyl)-L-serine = UDP + [protein]-3-O-(β-D-GalNAc-(1→4)-β-D-GlcA-(1→3)-β-D-Gal-(1→3)-β-D-Gal-(1→4)-β-D-Xyl)-L-serine |
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For diagram of chondroitin biosynthesis (later stages), click here |
| Glossary: |
[protein]-3-O-(β-D-GlcA-(1→3)-β-D-Gal-(1→3)-β-D-Gal-(1→4)-β-D-Xyl)-L-serine = [protein]-3-O-(β-D-glucuronosyl-(1→3)-β-D-galactosyl-(1→3)-β-D-galactosyl-(1→4)-β-D-xylosyl)-L-serine |
| Other name(s): |
N-acetylgalactosaminyltransferase I; glucuronylgalactosylproteoglycan β-1,4-N-acetylgalactosaminyltransferase; uridine diphosphoacetylgalactosamine-chondroitin acetylgalactosaminyltransferase I; UDP-N-acetyl-D-galactosamine:D-glucuronyl-1,3-β-D-galactosyl-proteoglycan β-1,4-N-acetylgalactosaminyltransferase; UDP-N-acetyl-D-galactosamine:D-glucuronyl-(1→3)-β-D-galactosyl-proteoglycan 4-β-N-acetylgalactosaminyltransferase |
| Systematic name: |
UDP-N-acetyl-D-galactosamine:[protein]-3-O-(β-D-GlcA-(1→3)-β-D-Gal-(1→3)-β-D-Gal-(1→4)-β-D-Xyl)-L-serine 4-β-N-acetylgalactosaminyltransferase (configuration-inverting) |
| Comments: |
Requires Mn2+. Involved in the biosynthesis of chondroitin sulfate. Key enzyme activity for the initiation of chondroitin and dermatan sulfates, transferring GalNAc to the GlcA-Gal-Gal-Xyl-Ser core. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 96189-39-8 |
| References: |
| 1. |
Rohrmann, K., Niemann, R. and Buddecke, E. Two N-acetylgalactosaminyltransferases are involved in the biosynthesis of chondroitin sulfate. Eur. J. Biochem. 148 (1985) 463–469. [DOI] [PMID: 3922754] |
| 2. |
Uyama, T., Kitagawa, H., Tamura, J.-i. and Sugahara, K. Molecular cloning and expression of human chondroitin N-acetylgalactosaminyltransferase: the key enzyme for chain initiation and elongation of chondroitin/dermatan sulfate on the protein linkage region tetrasaccharide shared by heparin/heparan sulfate. J. Biol. Chem. 277 (2002) 8841–8846. [DOI] [PMID: 11788602] |
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| [EC 2.4.1.174 created 1989, modified 2002] |
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