Uridine 5'-diphosphogalactose disodium salt

Uridine 5′-diphospho-alpha-D-galactose (UDP-Gal) is a nucleotide sugar. UDP-Gal is a donor substrate for galactosyltransferases used in the biosynthesis of galactose-containing oligosaccharides. UDP-Gal has been used as a component in galactosyltransferase labeling buffer to prelabel terminal N-acetylglucosamine (GlcNAc) on immunoglobulin chains. It has also been used as a component in Hyp O-galactosyltransferase (HPGT) assay. Decreased red blood cell levels of UDP-Gal are found in patients with maple syrup urine disease or phenylketonuria.