Uridine diphosphate-N-acetylgalactosamine
IUPAC 名称
[({[5-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy}(hydroxy)phosphoryl)oxy]({[3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy})phosphinic acid
描述
Uridine diphosphate-N-acetylgalactosamine (UDP-GalNAc) is a sugar donor metabolite, transferring N-acetylgalactosamine (GalNAc, an O-glycan) from UDP-GalNAc to serine and threonine residues, forming an alpha anomeric linkage in a reaction catalyzed by enzymes known as UDP-N-acetylgalactosamine: polypeptide N-acetylgalactosaminyltransferases; addition of GalNAc to serine or threonine represents the first committed step in mucin biosynthesis. O-glycans impart unique structural features to mucin glycoproteins and numerous membrane receptors, and resistance to thermal change and proteolytic attack in a number of diverse proteins. O-linked carbohydrate side chains function as ligands for receptors; lymphocyte and leukocyte homing and as signals for protein sorting. (PMID: 12634319)
Animal studies suggest that overactivity of the hexosamine pathway, resulting in increased UDP-hexosamines [i.e.: UDP-N-acetylgalactosamine (UDP-GalNAc)] is an important mechanism by which hyperglycemia causes insulin resistance. However, to date, human studies concerning the role of the hexosamine pathway in hyperglycemia-induced insulin resistance are scarce and restricted to measurements of glutamine fructose-6-phosphate amidotransferase (GFAT) enzyme activity. Both positive and negative correlations between GFAT activity in human muscle tissue from patients with type 2 DM and glucose disposal rate have been reported. (PMID: 12414889) [HMDB]
异构
CC(=O)NC1C(O)C(O)C(CO)OC1OP(O)(=O)OP(O)(=O)OCC1OC(C(O)C1O)N1C=CC(=O)NC1=O
InChI标识符
InChI=1S/C17H27N3O17P2/c1-6(22)18-10-13(26)11(24)7(4-21)35-16(10)36-39(31,32)37-38(29,30)33-5-8-12(25)14(27)15(34-8)20-3-2-9(23)19-17(20)28/h2-3,7-8,10-16,21,24-27H,4-5H2,1H3,(H,18,22)(H,29,30)(H,31,32)(H,19,23,28)
键
LFTYTUAZOPRMMI-UHFFFAOYSA-N