title: Menaquinone function in the respiratory chain of Micrococcus lysodeikticus.
abstract: Menaquinone-9 which is destructed under long-wave UV-irradiation is isolated from Micrococcus lysodeikticus membranes. NAD-H, malate and lactate oxidases are observed to be inhibited under irradiation, dehydrogenases of these substrates being almost intact. Photoinactivation of menaquinone results in the reduction of only one from two cytochromes b, presented in the membrane, thus testifying the location of menaquinone-9 between cytochromes b in the respiratory chain. Reconstruction of malate, NAD-H and lactate oxidases after irradiation took place when natural menaquinone (MQ-9) or menadione (MQ-0) were added. Detailed scheme of M. lysodeikticus respiratory chain is given.
mesh_terms: D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008291:Malate Dehydrogenase / Q000378:metabolism; D008837:Micrococcus / Q000378:metabolism* / Q000528:radiation effects; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism; D010101:Oxygen Consumption / Q000187:drug effects*; D011809:Quinones / Q000378:metabolism / Q000494:pharmacology* / Q000528:radiation effects; D011830:Radiation Effects; D014466:Ultraviolet Rays; D014812:Vitamin K / Q000494:pharmacology
chemical_list: D011809:Quinones; D014812:Vitamin K; D007770:L-Lactate Dehydrogenase; D008291:Malate Dehydrogenase; D009247:NADH, NADPH Oxidoreductases
vernacular_title: Funktsiia menakhinona v dykhatel'noĭ tsepi Micrococcus lysodeikticus