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[Interrelationship between the generation of oxygen anion-radicals and the reduction of artificial acceptors and cytochrome P-450 by NADPH-cytochrome c reductase].

The interaction of NADPH-cytochrome c reductase with oxygen, artificial acceptors and cytochrome P-450 is investigated. It is found that generation of oxygen anion-radicals (O2-), determined from the reaction of adrenaline oxidation into adrenochrome, proceeds independently on the reactions of interaction with artificial "anaerobic" acceptors-cytochrome c, dichlorophenolindophenol. Propylgallate competitively inhibits the reaction of adrenaline oxidation by isolated DADPH-cytochrome c reductase and non-competitively suppress the reaction of cytochrome c reduction. In contrast to the process of electron transfer on cytochrome c, there is a direct correlation between the rate of cytochrome P-450 reduction and the rate of adrenaline oxidation in liver microsomes. Hexobarbital increases V of the adrenaline oxidation reaction and does not affect the Km value, while metirapon, a metabolic inhibitor, decreases the Vmax and does not change Km. On the basis of the data obtained it is suggested that the reactions of NADPH-cytochrome c reductase interaction with oxygen and artificial "anaerobic" acceptors are connected with different redox-states of flavoprotein or with different flavine coenzymes, and that the electron transport on cytochrome P-450 and directly on oxygen takes place in interrelated redox-states of flavoprotein.