Uracil/thymine dehydrogenase
class of enzymes

Uracil/thymine dehydrogenase (EC 1.17.99.4, uracil oxidase, uracil-thymine oxidase, uracil dehydrogenase) is an enzyme with systematic name uracil:acceptor oxidoreductase. This enzyme catalyses two related chemical reactions:
In a similar way, thymine is converted to 5-methylbarbituric acid. The enzyme forms part of the oxidative pyrimidine-degrading pathway in some microorganisms.
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