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Xylose and some non-sugar carbon sources cause catabolite repression in Saccharomyces cerevisiae

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Abstract.

Glucose and other sugars, such as galactose or maltose, are able to cause carbon catabolite repression in Saccharomyces cerevisiae. Although glycolytic intermediates have been suggested as signal for repression, no evidence for such a control mechanism is available. The establishment of a correlation between levels of intracellular metabolites and the extent of catabolite repression may facilitate the identification of potential signal molecules in the process. To set a framework for such a study, the repression produced by xylose, glycerol and dihydroxyacetone upon genes belonging to different repressible circuits was tested, using an engineered strain of S. cerevisiae able to metabolize xylose. Xylose decreased the derepression of various enzymes in the presence of ethanol by at least 10-fold; the corresponding mRNAs were not detected in these conditions. Xylose also impaired the derepression of galactokinase and invertase. Glycerol and dihydroxyacetone decreased 2- to 3-fold the derepression observed in ethanol or galactose but did not affect invertase derepression. For yeast cells grown in media with different carbon sources, no correlation was found between repression of fructose-1,6-bisphosphatase and intracellular levels of glucose 6-phosphate or fructose 1,6-bisphosphate.

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Acknowledgements.

We thank B. Hahn-Hägerdal and P. Kötter for providing yeast strains. We are indebted to Eduardo Silles for determining the concentration of intracellular metabolites. This work was supported by EU project BIO-HUG QLK3-CT-1999-00080 and by grant BMC2001-1690-CO2-01 from the Dirección General de Investigación Científica y Técnica. M.M. had a fellowship from the EU and later from the DGICYT.

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  1. Instituto de Investigaciones Biomédicas ″Alberto Sols″, CSIC-UAM, Arturo Duperier 4, 28029, Madrid, Spain

    Mónica M. Belinchón & Juana M. Gancedo

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  1. Mónica M. Belinchón
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  2. Juana M. Gancedo
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Correspondence to Juana M. Gancedo.

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Belinchón, M.M., Gancedo, J.M. Xylose and some non-sugar carbon sources cause catabolite repression in Saccharomyces cerevisiae . Arch Microbiol 180, 293–297 (2003). https://doi.org/10.1007/s00203-003-0593-9

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  • DOI: https://doi.org/10.1007/s00203-003-0593-9

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