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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 2.4.1.212

Accepted Name
Hyaluronan synthase.
Alternative Name(s)
HAS.
Reaction catalysed
  • UDP-alpha-N-acetyl-D-glucosamine + beta-D-glucuronosyl-(1->3)-N-acetyl-beta-D-glucosaminyl-(1->4)-(nascent hyaluronan) <=> UDP + N-acetyl-beta-D-glucosaminyl-(1->4)-beta-D-glucuronosyl-(1->3)-N-acetyl-beta-D-glucosaminyl-(1->4)-(nascent hyaluronan)
  • UDP-alpha-D-glucuronate + N-acetyl-beta-D-glucosaminyl-(1->4)-beta-D-glucuronosyl-(1->3)-(nascent hyaluronan) <=> UDP + beta-D-glucuronosyl-(1->3)-N-acetyl-beta-D-glucosaminyl-(1->4)-beta-D-glucuronosyl-(1->3)-(nascent hyaluronan)
Cofactor(s)
Mg(2+).
Comment(s)
  • Adds GlcNAc to nascent hyaluronan when the non-reducing end is GlcA, but it adds GlcA when the non-reducing end is GlcNAc.
  • Highly specific for UDP-GlcNAc and UDP-GlcA; no copolymerization is observed if either is replaced by UDP-Glc, UDP-Gal, UDP-GalNAc or UDP-GalA.
Cross-references
BRENDA2.4.1.212
EC2PDB2.4.1.212
ExplorEnz2.4.1.212
PRIAM enzyme-specific profiles2.4.1.212
KEGG Ligand Database for Enzyme Nomenclature2.4.1.212
IUBMB Enzyme Nomenclature2.4.1.212
IntEnz2.4.1.212
MEDLINEFind literature relating to 2.4.1.212
MetaCyc2.4.1.212
UniProtKB/Swiss-Prot
P0C0H1, HASA_STRP1;  P0DB60, HASA_STRP3;  Q5X9A9, HASA_STRP6;  
Q8NKX1, HASA_STRP8;  P0DB61, HASA_STRPQ;  P0C0H0, HASA_STRPY;  
Q7BLV3, HAS_PASMD;  Q92839, HYAS1_HUMAN;  Q61647, HYAS1_MOUSE;  
P13563, HYAS1_XENLA;  B1WB39, HYAS1_XENTR;  O97711, HYAS2_BOVIN;  
O57424, HYAS2_CHICK;  G5AY81, HYAS2_HETGA;  Q92819, HYAS2_HUMAN;  
P70312, HYAS2_MOUSE;  O35776, HYAS2_RAT;  O57427, HYAS2_XENLA;  
O57425, HYAS3_CHICK;  O00219, HYAS3_HUMAN;  O08650, HYAS3_MOUSE;  
O57426, HYAS3_XENLA;  

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All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.4.1.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.4.-.-
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