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The beta-1,3 galactosyltransferase( beta3GalT) gene family encodes a set of type II transmembrane glycoproteins that are catalytically diverse and use different donor substrates (UDP-galactose and UDP-N-acetylglucosamine) and different acceptor sugars (N-acetylglucosamine, galactose, N-acetylgalactosamine ) to catalyze the addition of an activated monosaccharide to a terminal lactose. The protein coding sequences for beta-1,3-Gal-T genes comprise a single exon and are distantly related to the Drosophila Brainiac gene. The beta-1,4-galactosyltransferase ( beta4GalT) gene family encodes type II membrane-bound glycoproteins that show exclusive specificity for the donor substrate, UDP-galactose. beta-1,4Gal-T genes transfer galactose in a beta-1,4 linkage to similar acceptor.
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