B3GAT3
Function
Glycosaminoglycans biosynthesis (PubMed:25893793). 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. Stimulates 2-phosphoxylose phosphatase activity of PXYLP1 in presence of uridine diphosphate-glucuronic acid (UDP-GlcUA) during completion of linkage region formation (PubMed:24425863).
Involvement in disease
Multiple joint dislocations, short stature, and craniofacial dysmorphism with or without congenital heart defects
JDSCD
An autosomal recessive disease characterized by dysmorphic facies, bilateral dislocations of the elbows, hips, and knees, clubfeet, and short stature, as well as cardiovascular defects.
None
The disease is caused by variants affecting the gene represented in this entry.
Pathway
Protein modification; protein glycosylation.
Post-translational modifications
N-glycosylated.
Sequence Similarities
Belongs to the glycosyltransferase 43 family.
Tissue Specificity
Ubiquitous (but weakly expressed in all tissues examined).
Cellular localization
- Golgi apparatus membrane
- Single-pass type II membrane protein
- Golgi apparatus
- cis-Golgi network
Alternative names
Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 3, Glucuronosyltransferase I, GlcAT-I, GlcUAT-I, B3GAT3