Abstract
Groups of young rats were fed a basal diet with beef tallow (BT) or corn oil (CO) added to provide 4 or 19% energy as linoleic acid. Mitochondria isolated from the livers of the rats fed the CO contained a significantly lower concentration of b-type cytochrome and significantly higher concentrations of cytochromes c, c1 and aa3. Cytochrome c oxidase activity also was elevated. The spectral characteristics of the b-type cytochrome varied between the 2 groups. The mitochondria from the rats fed CO contained relatively more of the cytochrome b-558 component whereas mitochondria from the BT group contained more of the cytochrome b-562 component. The classical antimycin A inhibition of electron transport between cytochromes b and c1 was partially bypassed in mitochondria with the more fluid membrane. The activation energy for cytochrome c oxidase in mitochondria from this group was significantly higher. These differences may be traced to the physical characteristics of the inner mitochondrial membrane.
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Abuirmeileh, N.M., Elson, C.E. The influence of linoleic acid intake on electron transport system components. Lipids 15, 925–931 (1980). https://doi.org/10.1007/BF02534416
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DOI: https://doi.org/10.1007/BF02534416