The action of such membrane-permeant cations as tetraphenyl phosphonium and dibenzyldimethyl ammonium upon fatty acid-uncoupled respiration has been studied with oligomycin-inhibited rat liver mitochondria. Both cations enhance fatty acid-stimulated respiration. This synergistic effect is explained by a facilitated permeation of the fatty acid anion across the inner membrane due to an ion-pair complex. It is concluded that fatty acid uncoupling in rat liver mitochondria is limited by fatty acid anion permeation.
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Peter Schönfeld (1992) studied this question.
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