ID 1.10.5.1 DE ribosyldihydronicotinamide dehydrogenase (quinone). AN NQO2. AN NRH:quinone oxidoreductase 2. AN N-ribosyldihydronicotinamide dehydrogenase (quinone). AN QR2. AN quinone reductase 2. CA 1-(beta-D-ribofuranosyl)-1,4-dihydronicotinamide + a quinone + H(+) = CA a quinol + beta-nicotinamide D-riboside. CC -!- Unlike EC 1.6.5.2, this quinone reductase cannot use NADH or NADPH; CC instead it uses N-ribosyl- and N-alkyldihydronicotinamides. CC -!- Polycyclic aromatic hydrocarbons, such as benz[a]anthracene, and the CC estrogens 17beta-estradiol and diethylstilbestrol are potent CC inhibitors, but dicoumarol is only a very weak inhibitor. CC -!- This enzyme can catalyze both 2-electron and 4-electron reductions, CC but one-electron acceptors, such as potassium ferricyanide, cannot be CC reduced. CC -!- Formerly EC 1.10.99.2. DR P16083, NQO2_HUMAN ; Q9JI75, NQO2_MOUSE ; Q5RBB9, NQO2_PONAB ; DR Q6AY80, NQO2_RAT ; //