Excretion of citric and isocitric acids by the yeast Saccharomycopsis lipolytica |
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Authors: | Brigitte Tréton Marie -Thérèse Le Dall H. Heslot |
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Affiliation: | (1) Laboratoire de Génétique, Institut National Agronomique, F-75231 Paris Cédex 05, France |
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Abstract: | Summary We investigated the excretion of citric and isocitric acids in a strain of Saccharomycopsis lipolytica grown on either n-paraffins, glucose, or glycerol. These acids were excreted in the ratio of 67:33 on n-paraffins and roughly 92:8 on either glucose or glycerol. However, with all the carbon sources used, the relative amount of isocitric acid in the intracellular pool remained below 10%. The assimilation of citric and isocitric acids was prevented when glucose or glycerol were the carbon sources, but not when n-paraffins were used. Citric acid stopped isocitric acid assimilation. These phenomena of selective assimilation and/or uptake might explain the variations observed in the ratio of citric to isocitric acids excreted on different carbon sources. |
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