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Flavin reductase (NADH) (EC 1.5.1.36, NADH-dependent flavin reductase, flavin:NADH oxidoreductase) is an enzyme with systematic name flavin:NAD⁺ oxidoreductase.^[1] This enzyme catalyses the following chemical reaction

reduced flavin + NAD⁺

\rightleftharpoons

flavin + NADH + H⁺

The Escherichia coli enzyme reduces free flavins by NADH.

References

Flavin+reductase+(NADH) at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Oxidoreductases: CH-NH (EC 1.5)
1.5.1: NAD or NADP acceptor	Dihydrofolate reductase Saccharopine dehydrogenase Methylenetetrahydrofolate reductase
1.5.3: oxygen acceptor	Dihydrobenzophenanthridine oxidase Sarcosine oxidase Proline oxidase
1.5.5: quinone acceptor	Electron-transferring-flavoprotein dehydrogenase
1.5.99	Sarcosine dehydrogenase Cytokinin dehydrogenase

Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)