Mitochondria of cytoplasmic respiratory mutants [mi-1] (poky) and [mi-4] contain about a fourfold molar excess of ubiquinone as compared to the wild-type strain of Neurospora crassa. In the wild type and [mi-1] cultures the concentration of ubiquinone remains constant during the exponential and stationary phase of growth. In [mi-4] cultures it markedly decreases in the stationary phase. The reduction of ubiquinone by substrates is approximately the same in the three strains tested and amounts 60 to 70% of total ubiquinone present in mitochondria, independent of its absolute amount. The reduction of ubiquinone on addition of substrates is accompanied by the similar reduction of cytochrome c. These indicate that mitochondrial ubiquinone and cytochrome c are involved in processes of oxidation in Neurospora and that ubiquinone belongs mainly if not entirely to the cytochrome system of electron transport in these strains
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