Linked Life Data

8268305

Source:http://linkedlifedata.com/resource/pubmed/id/8268305

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pubmed-article:8268305pubmed:abstractTextBased on the inhibitor analysis data, it has been assumed that the Q-cycle plays a role in the cyano-resistant malate oxidation induced by menadione (90 microM) in rat liver mitochondria. The extent of involvement of Q-cycle transmitters in the cyano-resistant respiration of mitochondria is determined by the mode of the electron supply into the Q-cycle. In the presence of dicumarol, i.e., under conditions when CoQ and menadione are reduced by NADH-quinone reductase, the bulk of the electrons pass through the o-center of the Q-cycle. Myxothiazole inhibits the respiration by 70-80%, while antimycin--by only 20-30%. In the presence of myxothiazole and antimycin menadione oxidizes cytochrome b. In the presence of rotenone, when menadione is reduced by DT-diaphorase, the rate of cyano-resistant respiration decreases approximately twofold; its sensitivity towards myxothiazole and antimycin drops down to 40%. In the absence of rotenone and dicumarol the Q-cycle does not participate in the cyano-resistant respiration which under these conditions is insensitive either to myxothiazole or to antimycin. It is concluded that the mechanism of cyano-resistant respiration changes with an alteration in the rates of quinones K3 and CoQ reduction. The mechanism of cyano-resistant respiration is also controlled by the medium tonicity. A reduction in the medium tonicity decrease the participation of the Q-cycle and, correspondingly, the sensitivity of the cyano-resistant respiration towards myxothiazole and antimycin.lld:pubmed
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pubmed-article:8268305pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:8268305pubmed:articleTitle[The effect of inhibitors of the Q-cycle on cyano-resistant oxidation of malate by rat liver mitochondria in the presence of menadione].lld:pubmed
pubmed-article:8268305pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8268305pubmed:publicationTypeEnglish Abstractlld:pubmed