| xanthine |
crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine
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| xanthine |
(xan
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| xanthine base |
A group of chemical compounds including xanthine, hypoxanthine, uric acid, and theobromine, which have a purine as their base. SYN: purine base.
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| xanthine b.’s |
purine b's.
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| xanthine dehydrogenase |
[EC 1.1.1.204] an enzyme of the oxidoreductase class that catalyzes the hydroxylation of xanthine or hypoxanthine to urate, using NAD+ as an electron acceptor. The enzyme is a molybdoflavoprotein with a bound FAD and two iron-sulfur centers. Under certain conditions the enzyme is converted to a form that can reduce molecular oxygen and is called xanthine oxidase. Deficiency of enzyme activity, due to isolated defect in the enzyme or to molybdenum cofactor deficiency (q.v.), results in xanthinuria and deposition of xanthine calculi.
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