uridylic acid

Uridine esterified by phosphoric acid on one or more sugar hydroxyl groups; UMP is typically uridine 5′-monophosphate; 2′ and 3′ derivatives also occur; precursor for the biosynthesis of other pyrimidine nucleotides. SYN: UMP synthase, uridine 5′-monophosphate.

- u. synthase a bifunctional enzyme that contains the activities of both orotate phosphoribosyltransferase and orotidine-5′-monophosphate decarboxylase; catalyzes a key step in pyrimidine biosynthesis; a deficiency of this enzyme leads to orotic aciduria.

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uri·dyl·ic acid .yu̇r-ə-.dil-ik- n a nucleotide C₉H₁₃N₂O₉P known in three isomeric forms obtained by hydrolysis of RNA called also UMP

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uri·dyl·ic ac·id (u″rĭ-dilґik) phosphorylated uridine; uridine monophosphate unless otherwise specified.