Flavin
From Wikipedia, the free encyclopedia
Flavin is a tricyclic heteronuclear organic ring based on pteridine whose biochemical source is the vitamin riboflavin. The flavin moiety is often attached with an adenosine diphosphate to form flavin adenine dinucleotide (FAD), and in other circumstances, is found as flavin mononucleotide (or FMN), a phosphorylated form of riboflavin. The flavin group is capable of undergoing oxidation-reduction reactions, and can accept either one electron in a two step process or can accept two electrons at once. In the form of FADH2, it is one of the cofactors that can transfer electrons to the electron transfer chain.
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[edit] FAD
Flavin adenine dinucleotide is a coenzyme for monoamine oxidase, D-amino acid oxidase, glucose oxidase, and xanthine oxidase.
[edit] FADH / FADH2
FADH and FADH2 are reduced forms of FAD. FADH2 is produced in the citric acid cycle. In oxidative phosphorylation, one molecule of FADH2 yields approximately 1.5 ATP
[edit] FMN
Flavin mononucleotide is a prosthetic group found in NADH dehydrogenase.
[edit] See also
[edit] References
- Voet, D.; Voet, J.G. (2004). Biochemistry (3rd ed.). John Wiley & Sons. ISBN 0-471-39223-5de:Flavine
