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  • Title: Waxmonoester fermentation in Euglena gracilis T. Factors favouring the synthesis of odd-numbered fatty acids and alcohols.
    Author: Schneider T, Betz A.
    Journal: Planta; 1985 Sep; 166(1):67-73. PubMed ID: 24241313.
    Abstract:
    Waxmonoester fermentation at the expense of endogenous paramylon was followed in the dark in autotrophically grown Euglena gracilis. With reduced oxygen tension and decreasing O2-consumption rates the proportion of odd-numbered fatty acids and alcohols increased up to a molar ratio of nearly 1:1 under strictly anaerobic conditions. Labelled (14)CO2, succinate and propionate were incorporated into odd-numbered fatty acids and alcohols 11 to 33 times faster than in even-numbered chains. The electron-flow inhibitor rotenone diminished waxester formation in total, but especially CO2 fixation and the synthesis of odd-numbered chains, without impeding anaerobic carbohydrate breakdown. These findings are indicative for propionyl-CoA as an intermediate in the synthesis of odd-numbered chains. Its probable synthesis in the methylmalonyl-CoA pathway is discussed with regard to energetics.
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