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The flavin group is capable of undergoing oxidation-reduction reactions, and can accept either one electron in a two-step process or two electrons at once. Reduction is made with the addition of hydrogen atoms to specific nitrogen atoms on the isoalloxazine ring system: Equilibrium between the oxidized (left) and totally reduced (right) forms ...
The flavin is generally tightly bound (as in adrenodoxin reductase, wherein the FAD is buried deeply). [1] About 5-10% of flavoproteins have a covalently linked FAD. [ 2 ] Based on the available structural data, FAD-binding sites can be divided into more than 200 different types.
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The flavin-containing monooxygenase (FMO) protein family specializes in the oxidation of xeno-substrates in order to facilitate the excretion of these compounds from living organisms. [1] These enzymes can oxidize a wide array of heteroatoms , particularly soft nucleophiles , such as amines , sulfides , and phosphites .
FAD is the more complex and abundant form of flavin and is reported to bind to 75% of the total flavoproteome [16] and 84% of human encoded flavoproteins. [17] Cellular concentrations of free or non-covalently bound flavins in a variety of cultured mammalian cell lines were reported for FAD (2.2-17.0 amol/cell) and FMN (0.46-3.4 amol/cell). [18]
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Coenzyme F 420 is a family of coenzymes involved in redox reactions in a number of bacteria and archaea. It is derived from coenzyme F O (7,8-didemethyl-8-hydroxy-5-deazariboflavin) and differs by having a oligoglutamyl tail attached via a 2-phospho-L-lactate bridge.