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Metabolism of fatty acid in yeast: addition of reducing agents to the reaction medium influences beta-oxidation activities, gamma-decalactone production, and cell ultrastructure in Sporidiobolus ruinenii cultivated on ricinoleic acid methyl ester

Abstract : The sensitivity of Sporidiobolus ruinenii yeast to the use of reducing agents, reflected in changes in the oxido-reduction potential at pH 7 (Eh(7)) environment, ricinoleic acid methyl ester catabolism, gamma-decalactone synthesis, cofactor level, P-oxidation activity, and ultrastructure of the cell, was studied. Three environmental conditions (corresponding to oxidative, neutral, and reducing conditions) were fixed with the use of air or air and reducing agents (hydrogen and dithiothreitol). Lowering Eh(7) to neutral conditions (Eh(7) = +30 mV and +2.5 mV) favoured the production of lactone more than the more oxidative condition (Eh(7) = +350 mV). In contrast, when a reducing condition was used (Eh(7) -130 mV), the production of gamma-decalactone was very low. These results were linked to changes in the cofactor ratio during lactone production, to the beta-oxidation activity involved in decanolide synthesis, and to ultrastructural modification of the cell.
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https://hal.inrae.fr/hal-02668233
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Submitted on : Sunday, May 31, 2020 - 12:23:12 PM
Last modification on : Friday, June 12, 2020 - 10:43:26 AM

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Gilles Feron, Genevieve Mauvais, Jeannine Lherminier, Joel Michel, Xiao-Dong Wang, et al.. Metabolism of fatty acid in yeast: addition of reducing agents to the reaction medium influences beta-oxidation activities, gamma-decalactone production, and cell ultrastructure in Sporidiobolus ruinenii cultivated on ricinoleic acid methyl ester. Canadian Journal of Microbiology, NRC Research Press, 2007, 53 (6), pp.738-749. ⟨10.1139/w07-028⟩. ⟨hal-02668233⟩

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