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.
journal_name
Arch Microbioljournal_title
Archives of microbiologyauthors
Belinchón MM,Gancedo JMdoi
10.1007/s00203-003-0593-9keywords:
subject
Has Abstractpub_date
2003-10-01 00:00:00pages
293-7issue
4eissn
0302-8933issn
1432-072Xjournal_volume
180pub_type
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