ID 1.17.99.4 DE uracil/thymine dehydrogenase. AN uracil dehydrogenase. AN uracil oxidase. AN uracil-thymine oxidase. CA (1) A + H2O + uracil = AH2 + barbiturate + H(+). CA (2) A + H2O + thymine = 5-methylbarbiturate + AH2 + H(+). CC -!- Forms part of the oxidative pyrimidine-degrading pathway in some CC microorganisms, along with EC 3.5.2.1 and EC 3.5.1.95. CC -!- Mammals, plants and other microorganisms utilize the reductive CC pathway, comprising EC 1.3.1.1 or EC 1.3.1.2, EC 3.5.2.2 and CC EC 3.5.1.6, with the ultimate degradation products being an L-amino CC acid, NH3 and CO2. CC -!- Formerly EC 1.1.99.19 and EC 1.2.99.1. //