B4GALT2 is one of 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 synthesizes N-acetyllactosamine in glycolipids and glycoproteins. Its substrate specificity is affected by alpha-lactalbumin but it is not expressed in lactating mammary tissue.
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Protein Aliases: 4-Gal; b4Gal-T2; Beta-1,4-galactosyltransferase 2; beta-1,4-galactosyltransferase II; Beta-1,4-GalTase 2; beta-4-GalT2; Beta-N-acetylglucosaminyl-glycolipid beta-1,4-galactosyltransferase; beta-N-acetylglucosaminyl-glycolipid beta-1,4-galactosyltransferase 2; Beta-N-acetylglucosaminylglycopeptide beta-1,4-galactosyltransferase; beta4Gal-T2; Lactose synthase A protein; N-acetyllactosamine synthase; Nal synthase; UDP-Gal:beta-GlcNAc beta-1,4-galactosyltransferase 2; UDP-Gal:betaGlcNAc beta 1,4- galactosyltransferase 2; UDP-Gal:betaGlcNAc beta 1,4- galactosyltransferase, polypeptide 2; UDP-Gal:betaGlcNAc beta 1,4-galactosyltransferase, polypeptide 2; UDP-galactose:beta-N-acetylglucosamine beta-1,4-galactosyltransferase 2
Gene Aliases: B4Gal-T2; B4Gal-T3; B4GALT2; beta4Gal-T2; Ggtb2
Molecular Function: glycosyltransferase