Flavoprotein
Flavoproteins are proteins that contain a nucleic acid derivative of riboflavin. These proteins are involved in a wide array of biological processes, including removal of radicals contributing to oxidative stress, photosynthesis, and DNA repair. The flavoproteins are some of the most-studied families of enzymes.
| Flavoprotein | |||||||||
|---|---|---|---|---|---|---|---|---|---|
the fmn binding protein athal3 | |||||||||
| Identifiers | |||||||||
| Symbol | Flavoprotein | ||||||||
| Pfam | PF02441 | ||||||||
| InterPro | IPR003382 | ||||||||
| SCOP2 | 1e20 / SCOPe / SUPFAM | ||||||||
| |||||||||
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). About 5-10% of flavoproteins have a covalently linked FAD. Based on the available structural data, FAD-binding sites can be divided into more than 200 different types.
90 flavoproteins are encoded in the human genome; about 84% require FAD and around 16% require FMN, whereas 5 proteins require both. Flavoproteins are mainly located in the mitochondria. Of all flavoproteins, 90% perform redox reactions and the other 10% are transferases, lyases, isomerases, ligases.