[Localization of ubiquinone-9 in electron transport chain of Candida guilliermondii].
The activity of ubiquinone-dependent enzyme systems was studied in mitochondrial fractions of the yeast Candida guilliermondii cultivated on the medium containing carbohydrates of hydrocarbons as a source of carbon. The activity of NADH2-oxidase and succinate-CoQ-reductase was higher in systems with mitochondrial fractions from the cells grown on the medium with n-paraffins than in mitochondrial fractions from the cells cultivated on the medium with glucose. About 30% of intracellular ubiquinone is located in the mitochondrial fraction of hydrocarbon oxidizing yeast cells; however, the activity of enzymes was stimulated upon introduction of exogeneous ubiquinones into the systems. Therefore, exogeneous ubiquinones may be involved in the electron transport chain during oxidation of reduced substrates. Both ubiquinone-dependent enzyme systems are resistant to storage.
D002175:Candida / Q000201:enzymology / Q000378:metabolism*; D004579:Electron Transport; D005947:Glucose / Q000378:metabolism; D006838:Hydrocarbons / Q000378:metabolism; D008928:Mitochondria / Q000201:enzymology; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism; D010084:Oxidation-Reduction; D013385:Succinate Dehydrogenase / Q000378:metabolism; D014451:Ubiquinone / Q000378:metabolism*
D006838:Hydrocarbons; D014451:Ubiquinone; D013385:Succinate Dehydrogenase; D009247:NADH, NADPH Oxidoreductases; D005947:Glucose
Uchastie ubikhinona-9 v tsepi perenosa élektronov u Candida guilliermondii