Flavin adenine dinucleotide is used as a redox cofactor by a variety of proteins involved in several important enzymatic reactions in metabolism. In human, most flavoproteins contain one or more loosely bound flavin adenine dinucleotide moieties. Flavoproteins include the succinate dehydrogenase complex, α-ketoglutarate dehydrogenase, folate/FAD-dependent tRNA methyltransferases, N-hydroxylating flavoprotein monooxygenases, and apoptosis-inducing factor 2. Flavoproteins are predominately located in the mitochondria due to their redox power. Of all flavoproteins, more than 90% perform redox reactions and ~ 10% are lyases, transferases, isomerases and ligases involved in nonredox reactions.
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