Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 3 (B3GAT3), a member of the glycosyltransferase 43 family, is also known as beta-1,3-glucuronyltransferase 3, glucuronosyltransferase I (GlcAT-I) and UDP-GlcUA:Gal beta-1,3-Gal-R glucuronyltransferase (GlcUAT-I). B3GAT3 plays a role in glycosaminoglycans biosynthesis and be involved in forming the linkage tetrasaccharide present in heparan sulfate and chondroitin sulfate. B3GAT3 can also play a role in the biosynthesis of l2/HNK-1 carbohydrate epitope on glycoproteins. Furthermore,B3GAT3 shows strict specificity for Gal-beta-1,3-Gal-beta-1,4-Xyl, exhibiting negligible incorporation into other galactoside substrates including Galbeta1-3Gal beta1-O-benzyl, Galbeta1-4GlcNAc and Galbeta1-4Glc.
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