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In biochemistry, flavin adenine dinucleotide (FAD) is a redox-active coenzyme associated with various proteins, which is involved with several enzymatic reactions in metabolism. A flavoprotein is a protein that contains a flavin group , which may be in the form of FAD or flavin mononucleotide (FMN).
The enzyme 4-hydroxybenzoate 3-monooxygenase, also commonly referred to as para-hydroxybenzoate hydroxylase (PHBH), is a flavoprotein belonging to the family of oxidoreductases. Specifically, it is a hydroxylase , and is one of the most studied enzymes and catalyzes reactions involved in soil detoxification, metabolism , and other biosynthetic ...
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 ...
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]
Flavin adenine dinucleotide (FAD) is a required co-factor in addition to the presence of an active site glutamate in order for the enzyme to function. The following reaction is the oxidation of the fatty acid by FAD to afford an α,β-unsaturated fatty acid thioester of coenzyme A:
GOx is a glucose oxidising enzyme with a molecular weight of 160 kDa. It is a dimeric glycoprotein consisting of two subunits each weighing 80 kDa. Flavinadenine dinucleotide (FAD) in the active site is buried approximately 1.5 nm inside the protein shell and acts as the initial electron acceptor. [11]
Adenine derivatives have various roles in biochemistry including cellular respiration, in the form of both the energy-rich adenosine triphosphate (ATP) and the cofactors nicotinamide adenine dinucleotide (NAD), flavin adenine dinucleotide (FAD) and Coenzyme A. It also has functions in protein synthesis and as a chemical component of DNA and RNA ...
Flavin adenine dinucleotide in its oxidized form, FAD is a cofactor of flavoprotein oxidoreductase enzymes. Flavoprotein pyridine nucleotide cytochrome reductases, including FAD catalyse the interchange of reducing equivalents (H+ or electrons). Initial electron donors and final electron acceptors comprise single electron carriers and two ...
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