Editing Flavin group (section)

==Photoreduction==
Both free and protein-bound flavins are [[Photoreduction|photoreducible]], that is, able to be reduced by [[light]], in a mechanism mediated by several organic compounds, such as some [[amino acid]]s, [[carboxylic acid]]s and [[amine]]s.<ref name="Massey1"/> This property of flavins is exploited by various light-sensitive proteins. For example, the LOV domain, found in many species of plant, fungi and bacteria, undergoes a reversible, light-dependent structural change which involves the formation of a bond between a cysteine residue in its peptide sequence and a bound FMN.<ref>{{cite journal | vauthors = Alexandre MT, Domratcheva T, Bonetti C, van Wilderen LJ, van Grondelle R, Groot ML, Hellingwerf KJ, Kennis JT | title = Primary reactions of the LOV2 domain of phototropin studied with ultrafast mid-infrared spectroscopy and quantum chemistry | journal = Biophysical Journal | volume = 97 | issue = 1 | pages = 227–37 | date = July 2009 | pmid = 19580760 | pmc = 2711383 | doi = 10.1016/j.bpj.2009.01.066 | bibcode = 2009BpJ....97..227A }}</ref>