Name

B4GALT1 Gene

UDP-Gal:betaGlcNAc beta 1,4- galactosyltransferase, polypeptide 1

This gene is one of seven beta-1,4-galactosyltransferase (beta4GalT) genes. They encode type II membrane-bound glycoproteins that appear to have exclusive specificity for the donor substrate UDP-galactose; all transfer galactose in a beta1,4 linkage to similar acceptor sugars: GlcNAc, Glc, and Xyl. Each beta4GalT has a distinct function in the biosynthesis of different glycoconjugates and saccharide structures. As type II membrane proteins, they have an N-terminal hydrophobic signal sequence that directs the protein to the Golgi apparatus and which then remains uncleaved to function as a transmembrane anchor. By sequence similarity, the beta4GalTs form four groups: beta4GalT1 and beta4GalT2, beta4GalT3 and beta4GalT4, beta4GalT5 and beta4GalT6, and beta4GalT7. This gene is unique among the beta4GalT genes because it encodes an enzyme that participates both in glycoconjugate and lactose biosynthesis. For the first activity, the enzyme adds galactose to N-acetylglucosamine residues that are either monosaccharides or the nonreducing ends of glycoprotein carbohydrate chains. The second activity is restricted to lactating mammary tissues where the enzyme forms a heterodimer with alpha-lactalbumin to catalyze UDP-galactose + D-glucose <=> UDP + lactose. The two enzymatic forms result from alternate transcription initiation sites and post-translational processing. Two transcripts, which differ only at the 5' end, with approximate lengths of 4.1 kb and 3.9 kb encode the same protein. The longer transcript encodes the type II membrane-bound, trans-Golgi resident protein involved in glycoconjugate biosynthesis. The shorter transcript encodes a protein which is cleaved to form the soluble lactose synthase. [provided by RefSeq, Jul 2008]

B4GALT1-AS1 Gene

B4GALT1 antisense RNA 1

b4galt1 Gene Set

From GeneRIF Biological Term Annotations

genes co-occuring with the biological term b4galt1 in literature-supported statements describing functions of genes from the GeneRIF Biological Term Annotations dataset.

B4GALT1 Gene Set

From Pathway Commons Protein-Protein Interactions

interacting proteins for B4GALT1 from the Pathway Commons Protein-Protein Interactions dataset.

Defective B4GALT1 causes B4GALT1-CDG (CDG-2d) Gene Set

From Reactome Pathways

proteins participating in the Defective B4GALT1 causes B4GALT1-CDG (CDG-2d) pathway from the Reactome Pathways dataset.