Recombinant Human Beta-1,4-galactosyltransferase 4 (B4GALT4), Truncated

Uniprot Id

O60513

Target Species

Human

Target Name

B4GALT4

Target Full Name

Beta-1,4-galactosyltransferase 4

Target Function

Galactose (Gal) transferase involved in the biosynthesis of glycoproteins, proteoglycans, and glycosyphingolipids. Catalyzes the transfer of Gal residue via a beta1->4 linkage from UDP-Gal to the non-reducing terminal N-acetyl glucosamine 6-O-sulfate (6-O-sulfoGlcNAc) in the linearly growing chain of both N- and O-linked keratan sulfate proteoglycans. Cooperates with B3GNT7 N-acetyl glucosamine transferase and CHST6 and CHST1 sulfotransferases to construct and elongate mono- and disulfated disaccharide units [->3Galbeta1->4(6-sulfoGlcNAcbeta)1->] and [->3(6-sulfoGalbeta)1->4(6-sulfoGlcNAcbeta)1->] within keratan sulfate polymer.

Target Subcellular Location

Golgi apparatus, Golgi stack membrane; Single-pass type II membrane protein. Note=Trans cisternae of Golgi stack.

Target Protein Families

Glycosyltransferase 7 family

Target Tissue Specificity

Highest expression is observed in placenta, pancreas, kidney and heart. Expressed in corneal epithelial cells.

Target Synonyms

B4GALT4; UNQ552/PRO1109; Beta-1,4-galactosyltransferase 4; Beta-1,4-GalTase 4; Beta4Gal-T4; b4Gal-T4; Beta-N-acetylglucosaminyl-glycolipid beta-1,4-galactosyltransferase; Lactotriaosylceramide beta-1,4-galactosyltransferase; N-acetyllactosamine synthase; Nal synthase; UDP-Gal:beta-GlcNAc beta-1,4-galactosyltransferase 4; UDP-galactose:beta-N-acetylglucosamine beta-1,4-galactosyltransferase 4

Target Background

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. The enzyme encoded by this gene appears to mainly play a role in glycolipid biosynthesis. Two alternatively spliced transcript variants have been found for this gene.