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Biogenesis of mitochondria 19 the effects of unsaturated fatty acid depletion on the lipid composition and energy metabolism of a fatty acid desaturase mutant of

Saccharomyces cerevisiae

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Abstract

  1. 1.

    The lipid composition of a mutant ofSaccharomyces cerevisiae which cannot synthesize unsaturated fatty acid (UFA) can be extensively manipulated by growing the organism in the presence of added fatty acids.

  2. 2.

    Growth of the mutant is supported by a wide range of unsaturated fatty acids including oleic, palmitoleic, petroselenic, 11-eicosaenoic, ricinoleic, arachidonic, clupanodonic, linoleic and linolenic acids; 9- and 10-hydroxystearic acids support growth less effectively, but erucic, nervonic, elaidic and saturated fatty acids (C8∶0−C20∶0)* are ineffective. All the fatty acids which support growth are incorporated into cell lipids, apparently without further metabolism.

  3. 3.

    The effects of altered lipid composition on the energy metabolism of yeast cells were investigated. Cells containing less than approximately 20% of their fatty acids as UFA cannot grow on non-fermentable substrates, and their growth on glucose is restricted to that which can be supported by fermentation alone.

  4. 4.

    UFA-depleted cells contain mitochondria which are apparently normal in morphology, furthermore they have normal levels of cytochromesa+a 3,b,c 1 andc and respire at normal rates. This suggests that the lesion in energy metabolism produced by UFA-depletion may be the loss of the ability of the mitochondria to couple respiration to phosphorylation.

  5. 5.

    UFA-depleted cells incorporate added UFA into their cell lipids and subsequently regain the ability to grow on non-fermentable substrates, showing that the lesion in energy metabolism is fully reversible.

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Authors and Affiliations

  1. Department of Biochemistry, Monash University, 3168, Clayton, Victoria, Australia

    J. W. Proudlock, J. M. Haslam & Anthony W. Linnane

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  1. J. W. Proudlock
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  2. J. M. Haslam
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  3. Anthony W. Linnane
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Proudlock, J.W., Haslam, J.M. & Linnane, A.W. Biogenesis of mitochondria 19 the effects of unsaturated fatty acid depletion on the lipid composition and energy metabolism of a fatty acid desaturase mutant of. J Bioenerg Biomembr 2, 327–349 (1971). https://doi.org/10.1007/BF01963829

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  • DOI: https://doi.org/10.1007/BF01963829

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