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Uridine diphosphate
Skeletal formula of uridine diphosphate
Ball-and-stick model of the UDP molecule as an anion
IUPAC name
Uridine 5′-(trihydrogen diphosphate)
Systematic IUPAC name
[(2R,3S,4R,5R)-5-(2,4-Dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxyoxolan-2-yl]methyl trihydrogen diphosphate
ECHA InfoCard 100.000.372 Edit this at Wikidata
MeSH Uridine+diphosphate
  • InChI=1S/C9H12N2O6.2H3O4P/c12-3-4-6(14)7(15)8(17-4)11-2-1-5(13)10-9(11)16;2*1-5(2,3)4/h1-2,4,6-8,12,14-15H,3H2,(H,10,13,16);2*(H3,1,2,3,4)/t4-,6-,7-,8-;;/m1../s1 checkY
Molar mass 404.161
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Uridine diphosphate, abbreviated UDP, is a nucleotide diphosphate. It is an ester of pyrophosphoric acid with the nucleoside uridine. UDP consists of the pyrophosphate group, the pentose sugar ribose, and the nucleobase uracil.

UDP is an important factor in glycogenesis. Before glucose can be stored as glycogen in the liver and muscles, the enzyme UDP-glucose pyrophosphorylase forms a UDP-glucose unit by combining glucose 1-phosphate with uridine triphosphate, cleaving a pyrophosphate ion in the process. Then, the enzyme glycogen synthase combines UDP-glucose units to form a glycogen chain. The UDP molecule is cleaved from the glucose ring during this process and can be reused by UDP-glucose pyrophosphorylase.[1][2]

See also