Flavin
Flavin is a tricyclic heteronuclear organic ring whose biochemical source is the vitamin
riboflavin. The flavin moiety is often conjugated with an
adenosine diphosphate to form
flavin adenine dinucleotide (e.g.
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 FADH
2, it is one of the cofactors that can transfer electrons to the
electron transfer chain. FMN is a prosthetic group found in
NADH dehydrogenase and FAD is a cofactor in the enzymes D-amino acid oxidase, glucose oxidase, and
xanthine oxidase.
Flavin is also the name of a commune in the Aveyron département, in France