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A new class EC 7, Translocases, has been added to the EC list. It will be part of ENZYME from release 2018_10. Read more about EC 7 here.

ENZYME entry: EC 2.4.1.175

Accepted Name
Glucuronosyl-N-acetylgalactosaminyl-proteoglycan 4-beta-N- acetylgalactosaminyltransferase.
Alternative Name(s)
Chondroitin synthase.
Glucuronyl-N-acetylgalactosaminylproteoglycan beta-1,4-N- acetylgalactosaminyltransferase.
N-acetylgalactosaminyltransferase II.
UDP-N-acetyl-D-galactosamine:D-glucuronyl-N-acetyl-1,3-beta-D- galactosaminylproteoglycan beta-1,4-N-acetylgalactosaminyltransferase.
Uridine diphosphoacetylgalactosamine-chondroitin acetylgalactosaminyltransferase II.
Reaction catalysed
  • UDP-N-acetyl-alpha-D-galactosamine + [protein]-3-O-(beta-D-GlcA-(1->3)-beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-serine <=> UDP + [protein]-3-O-(beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-serine
  • UDP-N-acetyl-alpha-D-galactosamine + [protein]-3-O-(beta-D-GlcA-(1->3)-(beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3))(n)-beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-serine <=> UDP + [protein]-3-O-((beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3))(n+1)-beta-D-GalNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-serine
Comment(s)
  • Involved in the biosynthesis of chondroitin sulfate.
  • The human form of this enzyme is a bifunctional glycosyltransferase, which also has the EC 2.4.1.226 activity required for the synthesis of the chondroitin sulfate disaccharide repeats.
  • Similar chondroitin synthase 'copolymerases' can be found in Pasteurella multocida and Escherichia coli.
Cross-references
BRENDA2.4.1.175
EC2PDB2.4.1.175
ExplorEnz2.4.1.175
PRIAM enzyme-specific profiles2.4.1.175
KEGG Ligand Database for Enzyme Nomenclature2.4.1.175
IUBMB Enzyme Nomenclature2.4.1.175
IntEnz2.4.1.175
MEDLINEFind literature relating to 2.4.1.175
MetaCyc2.4.1.175
UniProtKB/Swiss-Prot
Q86X52, CHSS1_HUMAN;  Q6ZQ11, CHSS1_MOUSE;  Q8IZ52, CHSS2_HUMAN;  
Q6IQX7, CHSS2_MOUSE;  Q70JA7, CHSS3_HUMAN;  Q5DTK1, CHSS3_MOUSE;  
Q7Z1Z1, CHSSA_CAEEL;  P45895, CHSSB_CAEEL;  Q8L0V4, CHS_ECOLX;  
Q9CMP0, CHS_PASMU;  

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