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- Photolyase abstract "Photolyases (EC 4.1.99.3) are DNA repair enzymes that repair damage caused by exposure to ultraviolet light. This enzyme mechanism requires visible light, preferentially from the violet/blue end of the spectrum, and is known as photoreactivation.Photolyase is a phylogenetically old enzyme which is present and functional in many species, from the bacteria to the fungi to plants and to the animals. Photolyase is particularly important in repairing UV induced damage in plants. The photolyase mechanism is no longer working in humans and other placental mammals who instead rely on the less efficient nucleotide excision repair mechanism. It is however a component of a patent a sunscreen called Eryfotona developed to treat actinic keratosisPhotolyases bind complementary DNA strands and break certain types of pyrimidine dimers that arise when a pair of thymine or cytosine bases on the same strand of DNA become covalently linked. These dimers result in a 'bulge' of the DNA structure, referred to as a lesion. The more common covalent linkage involves the formation of a cyclobutane bridge. Photolyases have a high affinity for these lesions and reversibly bind and convert them back to the original bases.Photolyases are flavoproteins and contain two light-harvesting cofactors. All photolyases contain the two-electron-reduced FADH-; they are divided into two main classes based on the second cofactor, which may be either the pterin methenyltetrahydrofolate (MTHF) in folate photolyases or the deazaflavin 8-hydroxy-7,8-didemethyl-5-deazariboflavin (8-HDF) in deazaflavin photolyases. Although only FAD is required for catalytic activity, the second cofactor significantly accelerates reaction rate in low-light conditions. The enzyme acts by electron transfer in which the reduced flavin FADH- is activated by light energy and acts as an electron donor to break the pyrimidine dimer.On the basis of sequence similarities DNA photolyases can be grouped into two classes. The first class contains enzymes from Gram-negative and Gram-positive bacteria, the halophilic archaebacteria Halobacterium halobium, fungi and plants. Proteins containing this domain also include Arabidopsis thaliana cryptochromes 1 and 2, which are blue light photoreceptors that mediate blue light-induced gene expression and modulation of circadian rhythms.Some sunscreens include photolyase in their ingredients, claiming a reparative action on UV-damaged skin.".
- Photolyase symbol "FAD_binding_7".
- Photolyase thumbnail Photolyase_1qnf.png?width=300.
- Photolyase wikiPageExternalLink eryfotona-ak-nmsc-cream.
- Photolyase wikiPageID "3249930".
- Photolyase wikiPageRevisionID "597955946".
- Photolyase caption "A deazaflavin photolyase from Anacystis nidulans, illustrating the two light-harvesting cofactors: FADH- and 8-HDF .".
- Photolyase hasPhotoCollection Photolyase.
- Photolyase interpro "IPR005101".
- Photolyase name "FAD binding domain of DNA photolyase".
- Photolyase pdb "A:214-492 A:214-492 A:176-418 A:176-418 B:202-469 D:207-472 A:207-472 :207-472 A:207-472 A:207-472 A:207-472 A:207-472 B:213-453".
- Photolyase pfam "PF03441".
- Photolyase prosite "PDOC00331".
- Photolyase scop "1".
- Photolyase symbol "FAD_binding_7".
- Photolyase subject Category:DNA_repair.
- Photolyase subject Category:EC_4.1.99.
- Photolyase type Biomolecule.
- Photolyase type Protein.
- Photolyase type BiologicalObject.
- Photolyase comment "Photolyases (EC 4.1.99.3) are DNA repair enzymes that repair damage caused by exposure to ultraviolet light. This enzyme mechanism requires visible light, preferentially from the violet/blue end of the spectrum, and is known as photoreactivation.Photolyase is a phylogenetically old enzyme which is present and functional in many species, from the bacteria to the fungi to plants and to the animals. Photolyase is particularly important in repairing UV induced damage in plants.".
- Photolyase label "Deossiribodipirimidina foto-liasi".
- Photolyase label "Fotoliasa".
- Photolyase label "Fotoliaza".
- Photolyase label "Photolyase".
- Photolyase label "Photolyase".
- Photolyase label "Photolyasen".
- Photolyase label "フォトリアーゼ".
- Photolyase sameAs Photolyasen.
- Photolyase sameAs Fotoliasa.
- Photolyase sameAs Photolyase.
- Photolyase sameAs Deossiribodipirimidina_foto-liasi.
- Photolyase sameAs フォトリアーゼ.
- Photolyase sameAs Fotoliaza.
- Photolyase sameAs m.09178g.
- Photolyase sameAs Q424241.
- Photolyase sameAs Q424241.
- Photolyase wasDerivedFrom Photolyase?oldid=597955946.
- Photolyase depiction Photolyase_1qnf.png.
- Photolyase isPrimaryTopicOf Photolyase.