uridine

Uracil ribonucleoside; one of the major nucleosides in RNAs; as the pyrophosphate (UDP, UDPG, etc.), u. is active in sugar metabolism. SYN: 1-β-d-ribofuranosyluracil.

- cyclic u. 3′,5′-monophosphate (cUMP) a cyclic nucleotide involved in metabolic regulation; inhibits the growth of some tumors.

- u. 5′-diphosphate (UDP) u. 5′-pyrophosphate; a condensation product of u. and pyrophosphoric acid.

- u. 5′-monophosphate (UMP) SYN: uridylic acid.

- u. phosphorylase a ribosyltransferase that catalyzes the reaction of u. with orthophosphate to produce uracil and α-d-ribose 1-phosphate.

- u. 5′-triphosphate (UTP) u. esterified with triphosphoric acid at its 5′ position; the immediate precursor of uridylic acid residues in RNA.

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uri·dine 'yu̇r-ə-.dēn n a crystalline pyrimidine nucleoside C₉H₁₂N₂O₆ that is composed of uracil attached to ribose, that is derived by hydrolysis from nucleic acids, and that in the form of phosphate derivatives plays an important role in carbohydrate metabolism

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n.

a compound containing uracil and the sugar ribose. See also nucleoside.

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uri·dine (ūrґĭ-dēn) a pyrimidine nucleoside, uracil linked by its N1 nitrogen to the C1 carbon of ribose. It is a component of ribonucleic acid, and its nucleotides participate in the biosynthesis of polysaccharides and some polysaccharide-containing compounds. Symbol U.