| uridine diphosphoxylose | <biochemistry> Monosaccharide pentose that is found in xylans, very abundant components of hemicelluloses. (18 Nov 1997) |
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| uridine kinase | <enzyme> An enzyme that catalyses the phosphorylation of uridine and cytidine to uridine 5'-phosphate and cytidine 5'-phosphate, respectively. ATP, dutp, dGTP, and datp are effective phosphate donors. Chemical name: ATP:uridine 5'-phosphotransferase Registry number: EC 2.7.1.48 (12 Dec 1998) |
| uridine nucleosidase | <chemical> Chemical name: nucleosidase, uridine Synonym: uridine ribohydrolase (26 Jun 1999) |
| uridine phosphorylase | <enzyme> An enzyme that catalyses the transfer of ribose from uridine to orthophosphate, forming uracil and ribose 1-phosphate. Chemical name: Uridine:orthophosphate alpha-D-ribosyltransferase Registry number: EC 2.4.2.3 (12 Dec 1998) |
| uridine-specific acid nuclease | <enzyme> Chicken liver enzyme hydrolyzes poly(u) and e. Coli RNA Registry number: EC 3.1.- (26 Jun 1999) |
| uridine triphosphatase | <enzyme> Rn in chemline for deoxyuridine triphosphatase: EC 3.6.1.23 Registry number: EC 3.6.1.- Synonym: utpase (26 Jun 1999) |
| uridine triphosphate | A molecule which consists of the nitrogenous base uracil linked to the sugar ribose and which has a chain of three phosphate groups attached to the ribose in a linear fashion. UTP is required during transcription since it is a direct precursor of RNA. (09 Oct 1997) |
| abequose synthase | <enzyme> Converts cdp-4-keto-3,6-dideoxy-d-glucose to cdp-3,6-dideoxy-d-galactose (cdp-abequose); requires NADPH, analogous to udp-glucose-4-epimerase Registry number: EC 5.1.3.- Synonym: rfbj gene product (26 Jun 1999) |
| acetoacetyl-acyl carrier protein synthase | <enzyme> E coli enzyme, that catalyses condensation of malonyl-acyl carrier protein plus acetyl-acyl carrier protein; not inhibited by cerulenin Registry number: EC 2.3.1.- Synonym: acetoacetyl-acp synthase (26 Jun 1999) |
| acetolactate synthase | <enzyme> A flavoprotein that catalyses the formation of acetolactate from 2 moles of pyruvate in the biosynthesis of valine and the formation of acetohydroxybutyrate from pyruvate and alpha-ketobutyrate in the biosynthesis of isoleucine. Chemical name: Acetolactate pyruvate-lyase (carboxylating) Registry number: EC 4.1.3.18 (12 Dec 1998) |
| acridone synthase | <enzyme> Catalyses the condensation of n-methylanthraniloyl-CoA and 3 malonyl-CoA to produce 1,3-dihydroxy-n-methylacridone Registry number: EC 2.3.1.- (26 Jun 1999) |
| acyl-malonyl-ACP synthase | <enzyme> An enzyme condensing malonyl-ACP and acyl-cys-protein to 3-oxoacyl-ACP + cys-protein + CO2, and similar reactions, as steps in fatty acid synthesis; cys-protein is also a part of the fatty acid synthase complex. Synonym: acyl-malonyl-ACP synthase, beta-ketoacyl-ACP synthase. (05 Mar 2000) |
| adenylosuccinate synthase | <enzyme> A carbon-nitrogen ligase. During purine ribonucleotide biosynthesis, this enzyme catalyses the synthesis of adenylosuccinate from GTP, imp, and aspartate with the formation of orthophosphate and GDP. Chemical name: IMP:L-aspartate ligase (GDP-forming) Registry number: EC 6.3.4.4 (12 Dec 1998) |
| adenylylosuccinate synthase | <enzyme> A carbon-nitrogen ligase. During purine ribonucleotide biosynthesis, this enzyme catalyses the synthesis of adenylosuccinate from GTP, imp, and aspartate with the formation of orthophosphate and GDP. Chemical name: IMP:L-aspartate ligase (GDP-forming) Registry number: EC 6.3.4.4 (12 Dec 1998) |
| agropine synthase | <enzyme> Final enzyme in the three enzyme pathway for agropine synthesis; cyclises deoxymannityl-glutamine to the lactone, agropine Registry number: EC 4.2.1.- Synonym: ags gene product (26 Jun 1999) |