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HMDB Protein ID HMDBP00933
Secondary Accession Numbers
  • 6221
  • HMDBP05788
Name Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 3
  1. Beta-1,3-glucuronyltransferase 3
  2. GlcAT-I
  3. GlcUAT-I
  4. Glucuronosyltransferase I
  5. UDP-GlcUA:Gal beta-1,3-Gal-R glucuronyltransferase
Gene Name B3GAT3
Protein Type Unknown
Biological Properties
General Function Involved in galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity
Specific Function Glycosaminoglycans biosynthesis. Involved in forming the linkage tetrasaccharide present in heparan sulfate and chondroitin sulfate. Transfers a glucuronic acid moiety from the uridine diphosphate-glucuronic acid (UDP-GlcUA) to the common linkage region trisaccharide Gal-beta-1,3-Gal-beta-1,4-Xyl covalently bound to a Ser residue at the glycosaminylglycan attachment site of proteoglycans. Can also play a role in the biosynthesis of l2/HNK-1 carbohydrate epitope on glycoproteins. 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.
  • Glycosaminoglycan biosynthesis - chondroitin sulfate / dermatan sulfate
  • Glycosaminoglycan biosynthesis - heparan sulfate / heparin
  • protein glycosylation
Uridine diphosphate glucuronic acid + 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein → Uridine 5'-diphosphate + 3-beta-D-glucuronosyl-3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein details
UDP-D-glucuronate + → UDP + details
GO Classification
Biological Process
heparan sulfate proteoglycan biosynthetic process
protein glycosylation
carbohydrate metabolic process
chondroitin sulfate metabolic process
chondroitin sulfate proteoglycan biosynthetic process
dermatan sulfate proteoglycan biosynthetic process
Cellular Component
integral to membrane
Golgi membrane
cis-Golgi network
cell part
catalytic activity
transferase activity
glucuronosyltransferase activity
galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity
udp-glycosyltransferase activity
transferase activity, transferring glycosyl groups
Molecular Function
manganese ion binding
galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity
Cellular Location
  1. Golgi apparatus membrane
  2. Single-pass type II membrane protein
Gene Properties
Chromosome Location 11
Locus 11q12.3
Gene Sequence
>1008 bp
Protein Properties
Number of Residues 335
Molecular Weight 37121.52
Theoretical pI 8.272
Pfam Domain Function
Signals Not Available
Transmembrane Regions Not Available
Protein Sequence
>Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 3
GenBank ID Protein 3892640
UniProtKB/Swiss-Prot ID O94766
UniProtKB/Swiss-Prot Entry Name B3GA3_HUMAN
GenBank Gene ID AB009598
GeneCard ID B3GAT3
GenAtlas ID B3GAT3
General References
  1. Gerhard DS, Wagner L, Feingold EA, Shenmen CM, Grouse LH, Schuler G, Klein SL, Old S, Rasooly R, Good P, Guyer M, Peck AM, Derge JG, Lipman D, Collins FS, Jang W, Sherry S, Feolo M, Misquitta L, Lee E, Rotmistrovsky K, Greenhut SF, Schaefer CF, Buetow K, Bonner TI, Haussler D, Kent J, Kiekhaus M, Furey T, Brent M, Prange C, Schreiber K, Shapiro N, Bhat NK, Hopkins RF, Hsie F, Driscoll T, Soares MB, Casavant TL, Scheetz TE, Brown-stein MJ, Usdin TB, Toshiyuki S, Carninci P, Piao Y, Dudekula DB, Ko MS, Kawakami K, Suzuki Y, Sugano S, Gruber CE, Smith MR, Simmons B, Moore T, Waterman R, Johnson SL, Ruan Y, Wei CL, Mathavan S, Gunaratne PH, Wu J, Garcia AM, Hulyk SW, Fuh E, Yuan Y, Sneed A, Kowis C, Hodgson A, Muzny DM, McPherson J, Gibbs RA, Fahey J, Helton E, Ketteman M, Madan A, Rodrigues S, Sanchez A, Whiting M, Madari A, Young AC, Wetherby KD, Granite SJ, Kwong PN, Brinkley CP, Pearson RL, Bouffard GG, Blakesly RW, Green ED, Dickson MC, Rodriguez AC, Grimwood J, Schmutz J, Myers RM, Butterfield YS, Griffith M, Griffith OL, Krzywinski MI, Liao N, Morin R, Palmquist D, Petrescu AS, Skalska U, Smailus DE, Stott JM, Schnerch A, Schein JE, Jones SJ, Holt RA, Baross A, Marra MA, Clifton S, Makowski KA, Bosak S, Malek J: The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). Genome Res. 2004 Oct;14(10B):2121-7. [PubMed:15489334 ]
  2. Kitagawa H, Tone Y, Tamura J, Neumann KW, Ogawa T, Oka S, Kawasaki T, Sugahara K: Molecular cloning and expression of glucuronyltransferase I involved in the biosynthesis of the glycosaminoglycan-protein linkage region of proteoglycans. J Biol Chem. 1998 Mar 20;273(12):6615-8. [PubMed:9506957 ]
  3. Ouzzine M, Gulberti S, Netter P, Magdalou J, Fournel-Gigleux S: Structure/function of the human Ga1beta1,3-glucuronosyltransferase. Dimerization and functional activity are mediated by two crucial cysteine residues. J Biol Chem. 2000 Sep 8;275(36):28254-60. [PubMed:10842173 ]
  4. Herman T, Horvitz HR: Three proteins involved in Caenorhabditis elegans vulval invagination are similar to components of a glycosylation pathway. Proc Natl Acad Sci U S A. 1999 Feb 2;96(3):974-9. [PubMed:9927678 ]
  5. Tone Y, Kitagawa H, Imiya K, Oka S, Kawasaki T, Sugahara K: Characterization of recombinant human glucuronyltransferase I involved in the biosynthesis of the glycosaminoglycan-protein linkage region of proteoglycans. FEBS Lett. 1999 Oct 15;459(3):415-20. [PubMed:10526176 ]
  6. Pedersen LC, Tsuchida K, Kitagawa H, Sugahara K, Darden TA, Negishi M: Heparan/chondroitin sulfate biosynthesis. Structure and mechanism of human glucuronyltransferase I. J Biol Chem. 2000 Nov 3;275(44):34580-5. [PubMed:10946001 ]