| nucleoside-diphosphate kinase | <enzyme> A phosphotransferase enzyme that is found in mitochondria and in the soluble cytoplasm of cells. It catalyses reversible reactions of a nucleoside triphosphate, e.g., ATP, with a nucleoside diphosphate, e.g., UDP, to form ADP and UTP. Many nucleoside diphosphates can act as acceptor, while many ribonucleoside triphosphates and deoxyribonucleoside triphosphates can act as a donor. Chemical name: ATP:nucleoside-diphosphate phosphotransferase Registry number: EC 2.7.4.6 (12 Dec 1998) |
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| nucleoside-diphosphate sugars | Nucleoside diphosphates linked through the 5'-diphosphoric group with simple or complex carbohydrates; e.g., GDP-mannose, UDP-glucose (UDPG), dTDP-glucosamine. (05 Mar 2000) |
| dehydrodolichyl diphosphate synthetase | <enzyme> Membrane-associated prenyl transferase from rat seminiferous tubules; dependent on t,t-farnesyl diphosphate, isopentenyldiphosphate and divalent cation; also from yeast saccharomyces carlsbergensis; looses its activity in the presence of 0.1% triton x-100 Registry number: EC 2.5.1.- Synonym: long chain polyprenyl diphosphate synthetase, dddp synthetase, dehydrodolichyl diphosphate synthase (26 Jun 1999) |
| deoxynucleoside diphosphate-oligonucleotide deoxynucleotidyl transferase | <chemical> Activated by mg++ Synonym: dndp-deoxynucleotidyl transferase, ddodt (26 Jun 1999) |
| dimethylallyl diphosphate-umbelliferone 6-dimethyltransferase | <enzyme> Catalyses the 6-prenylation of umbelliferone, forming demethylsuberosin Registry number: EC 2.5.1.- Synonym: ddud-transferase (26 Jun 1999) |
| dimethylallyl diphosphate umbelliferone 7-O-dimethyltransferase | <enzyme> Catalyses the 7-o-prenylation of umbelliferone, forming o-prenylumbelliferone Registry number: EC 2.5.1.- Synonym: ddu7-transferase (26 Jun 1999) |
| diphosphate | <chemistry> Two phosphate groups linked by esterification. Released in many of the synthetic steps involving nucleotide triphosphates (e.g. Protein and nucleic acid elongation). Rapid cleavage by enzymes that have high substrate affinity ensures that these reactions are essentially irreversible. (18 Nov 1997) |
| dolichol phosphate glucose-dolichol diphosphate oligosaccharide glucosyltransferase | <enzyme> Can also use dolichol-p-galactose as donor Registry number: EC 2.4.1.- Synonym: dolichol-p-glucose-dolichol-p-p-oligosaccharide glucosyltransferase, dolichol-pp-oligosaccharide glucosyltransferase (ii), dolichol-p-p-oligosaccharide glucosyltransferase (i), dol-p-p-oligosaccharide glycosyltransferase, dppo-glucosyltransferase, dolichyl-p-glucose-man(9)(glcnac)2-pp-dolichol glucosyltransferase (26 Jun 1999) |
| inosine 5'-diphosphate | Inosine esterified at its 5' position with diphosphoric acid. Acronym: IDP (05 Mar 2000) |
| inosine diphosphate | <chemical> Inosine 5'-(trihydrogen diphosphate). An inosine nucleotide containing two phosphate groups esterified to the sugar moiety. Synonym: irpp; inosine pyrophosphate. Chemical name: Inosine 5'-(trihydrogen diphosphate) (12 Dec 1998) |
| thymidine 5'-diphosphate | Thymidine esterified at its 5' position with diphosphoric acid. Acronym: dTDP (05 Mar 2000) |
| farnesylgeranyl diphosphate synthase | <enzyme> A prenyltransferase which synthesises c25-prenyl diphosphate; distinct from geranylgeranyl diphosphate synthase (EC 2.5.1.29); can use geranylgeranyl diphosphate as a substrate Registry number: EC 2.5.1.- Synonym: fgpp synthase (26 Jun 1999) |
| uridine 5'-diphosphate | A condensation product of uridine and pyrophosphoric acid. See: UDP. (05 Mar 2000) |
| uridine diphosphate | <chemical> Uridine 5'-(trihydrogen diphosphate). A uracil nucleotide containing two phosphate groups esterified to the sugar moiety. Synonym: uridine pyrophosphate; urpp. Chemical name: Uridine 5'-(trihydrogen diphosphate) (12 Dec 1998) |
| uridine diphosphate galactose | <chemical> A nucleoside diphosphate sugar which can be epimerised into udpglucose for entry into the mainstream of carbohydrate metabolism. Serves as a source of galactose in the synthesis of lipopolysaccharides, cerebrosides, and lactose. Chemical name: Uridine 5'-(trihydrogen diphosphate), P'-alpha-D-galactopyranosyl ester (12 Dec 1998) |