| desulfo xanthine dehydrogenase | <enzyme> Naturally occuring inactive form of xanthine dehydrogenase Registry number: EC 1.1.1.- (26 Jun 1999) |
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| xanthine dehydrogenase | <enzyme> An enzyme that catalyses the oxidation of xanthine in the presence of NAD+ to form urate and NADH. It acts also on a variety of other purines and aldehydes. Chemical name: Xanthine:NAD+ oxidoreductase Registry number: EC 1.1.1.204 (12 Dec 1998) |
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| methyl xanthine | <chemical, drug> Naturally occurring purine alkaloids such as theobromine, theophylline and caffeine (trimethyl xanthine). They inhibit cAMP phosphodiesterase and thus cause an increase in the intracellular cAMP concentration. (18 Nov 1997) |
| xanthine | <biochemistry> A purine, the starting point for purine degradation. Its methylated derivatives (theophylline, theobromine, caffeine) are potent cAMP phosphodiesterase inhibitors. (18 Nov 1997) |
| xanthine alkaloids | Alkaloids, which contain xanthine as their nitrogenous base. (12 Dec 1998) |
| xanthine bronchodilator | <pharmacology> A group of medications that work by a common mechanism to effect bronchodilation (open up air passages) in the lungs. Used in the treatment of asthma and related conditions. Examples include: theophylline, aminophylline and dyphylline. (27 Sep 1997) |
| xanthine nucleotide | The monophosphoric ester of xanthosine. An intermediate in GMP biosynthesis. Synonym: xanthidylic acid, xanthine nucleotide, xanthylic acid. (05 Mar 2000) |
| xanthine oxidase | <enzyme> Dehydrogenases involved in conversion of hypoxanthine to xanthine and xanthine to uric acid, as the final catabolism of purines. Deficient in the human disease xanthinuria. (18 Nov 1997) |
| xanthine ribonucleoside | 9-beta-d-ribosylxanthine;the deamination product of guanosine (O replacing -NH2). Synonym: xanthine ribonucleoside. Abbreviation: Xao (05 Mar 2000) |
| hypoxanthine-guanine-xanthine phosphoribosyltransferase | <enzyme> From tritrichomonas foetus; in contrast to EC 2.4.2.8, this enzyme also uses xanthine as substrate; mw 24 kD Registry number: EC 2.4.2.- Synonym: hgxprtase (26 Jun 1999) |
| acetaldehyde dehydrogenase | <enzyme> Works with both nad and nadp Registry number: EC 1.2.1.5 Synonym: aldehyde dehydrogenase (NADP+), naho gene product (26 Jun 1999) |
| acetoin dehydrogenase | <enzyme> An enzyme that catalyses the conversion of acetoin to diacetyl in the presence of NAD. Chemical name: Acetoin:NAD+ oxidoreductase Registry number: EC 1.1.1.5 (12 Dec 1998) |
| acetol dehydrogenase | <enzyme> Forms methylglyoxal; uses nad+ Registry number: EC 1.1.1.- Synonym: 1-hydroxyacetone dehydrogenase (26 Jun 1999) |
| acyl-ACP dehydrogenase | enoyl-ACP reductase (NADPH) |
| acyl-CoA dehydrogenase | <enzyme> See also records for specific fatty acyl groups which have full EC nomenclature number; electron-transferring flavoprotein system reducing ubiquinone and other acceptors; formerly EC 1.3.2.2 Registry number: EC 1.3.99.3 Synonym: fatty-acyl CoA dehydrogenase, palmitoyl-CoA dehydrogenase, short-chain acyl-CoA dehydrogenase, acyl-coenzyme a dehydrogenase, lauroyl-CoA oxidase (26 Jun 1999) |
| acyl-CoA dehydrogenase (NADPH+) | Enzyme catalyzing the reversible reduction of enoyl-CoA derivatives of chain length 4 to 16, with NADPH as the hydrogen donor, forming acyl-CoA and NADP+. Synonym: enoyl-CoA reductase. (05 Mar 2000) |