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Flavin adenine dinucleotide consists of two portions: the adenine nucleotide (adenosine monophosphate) and the flavin mononucleotide (FMN) bridged together through their phosphate groups. Adenine is bound to a cyclic ribose at the 1' carbon, while phosphate is bound to the ribose at the 5' carbon to form the adenine nucledotide.
Flavoproteins have either FMN (flavin mononucleotide) or FAD (flavin adenine dinucleotide) as a prosthetic group or as a cofactor. 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]
Therefore, SDHA is a flavoprotein (Fp) due to the prosthetic group flavin adenine dinucleotide (FAD). Crystal structure suggests that FAD is covalently bound to a histidine residue (His99) and further coordinated by hydrogen bonds with number of other amino acid residues within the FAD-binding domain.
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 ...
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Riboflavin, also known as vitamin B 2, is a vitamin found in food and sold as a dietary supplement. [3] It is essential to the formation of two major coenzymes, flavin mononucleotide and flavin adenine dinucleotide. These coenzymes are involved in energy metabolism, cellular respiration, and antibody production, as well as normal growth and ...