title: The photosensitivity of the malate oxidase system of a pigmented strain and a carotenoidless mutant of Sarcina lutea (Micrococcus luteus).
abstract: The effect of white light on the malate oxidase of Sarcina lutea (Micrococcus luteus) membranes has been examined using a carotenoid-containing and a carotenoidless mutant. At least three photosensitive sites have been detected. Two of these are associated with the malate dehydrogenase complex (malate-menaquinone reductase) and are unaffected by membrane carotenoid. A third site which has been detected beyond the dehydrogenase complex, is protected by carotenoid since it can only be demonstrated in carotenoidless systems. A repair mechanism has been found for one of the two sites in the dehydrogenase complex.
mesh_terms: D002338:Carotenoids / Q000096:biosynthesis; D002462:Cell Membrane / Q000201:enzymology / Q000528:radiation effects; D008027:Light; D008291:Malate Dehydrogenase / Q000378:metabolism / Q000528:radiation effects*; D008837:Micrococcus / Q000201:enzymology* / Q000378:metabolism / Q000528:radiation effects; D009154:Mutation; D011808:Quinone Reductases / Q000378:metabolism / Q000528:radiation effects
chemical_list: D002338:Carotenoids; D008291:Malate Dehydrogenase; D011808:Quinone Reductases