title: [Alternative oxidation pathways in the respiratory chain of Brevibacterium flavum].
abstract: A scheme is proposed for the branched respiratory chain in Brevibacterium flavum 22 LD. Three branching sites in the main electron transport pathway are suggested: at the initial stage of NADH2 oxidation (before menaquinone) and at the levels of cytochromes b and c. Up to 40% out of the total oxygen is consumed in the NADH2-dependent alternative oxidative pathway in the presence of 5.10(-3) M cyanide or after the near UV treatment. This bypass differs from the main electron flow with a lower P/O ratio. Exogenous NADH2 catalyses the univalent reduction of oxygen through superoxide production in the bacterial membranes. Alternative oxidation pathways are discussed regarding their regulatory role in the bacterial energy metabolism.
mesh_terms: D001951:Brevibacterium / Q000378:metabolism*; D003470:Culture Media; D003486:Cyanides / Q000494:pharmacology; D003580:Cytochromes / Q000378:metabolism; D004579:Electron Transport / Q000187:drug effects / Q000528:radiation effects; D009243:NAD / Q000378:metabolism; D010084:Oxidation-Reduction; D010101:Oxygen Consumption / Q000187:drug effects / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D003470:Culture Media; D003486:Cyanides; D003580:Cytochromes; D009243:NAD
vernacular_title: Al'ternativnye puti okisleniia v dykhatel'noĭ tsepi Brevibacterium flavum.