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Here we use this to investigate the degree of transcriptional regulation of fluxes in the metabolism of <jats:italic>Saccharomyces cerevisiae<\/jats:italic>. We do this by quantifying correlations between changes in CEFs and changes in transcript levels for shifts in carbon source, i.e. between the fermentative carbon source glucose and nonfermentative carbon sources like ethanol, acetate, and lactate. The CEF analysis is based on a simple stoichiometric model that includes reactions of the central carbon metabolism and the amino acid metabolism.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The effect of the carbon shift on the metabolic fluxes was investigated for both batch and chemostat cultures. For growth on glucose in batch (respiro-fermentative) cultures, EFMs with no by-product formation were removed from the analysis of the CEFs, whereas those including any by-products (ethanol, glycerol, acetate, succinate) were omitted in the analysis of growth on glucose in chemostat (respiratory) cultures. This resulted in improved correlations between CEF changes and transcript levels. A regression correlation coefficient of 0.60 was obtained between CEF changes and gene expression changes in the central carbon metabolism for the analysis of 5 different perturbations. Out of 45 data points there were no more than 6 data points deviating from the correlation. Additionally, up- or down-regulation of at least 75% of the genes were in qualitative agreement with the CEF changes for all perturbations studied.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>The analysis indicates that changes in carbon source are associated with a high degree of hierarchical regulation of metabolic fluxes in the central carbon metabolism as the change in fluxes are correlating directly with the change in transcript levels of genes encoding their corresponding enzymes. For amino acid biosynthesis there was, however, not found to exist a similar correlation, and this may point to either post-transcriptional and\/or metabolic regulation, or be due to the absence of a direct perturbation on the amino acid pathways in these experiments.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1752-0509-1-18","type":"journal-article","created":{"date-parts":[[2007,5,2]],"date-time":"2007-05-02T15:31:14Z","timestamp":1178119874000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Effect of carbon source perturbations on transcriptional regulation of metabolic fluxes in Saccharomyces cerevisiae"],"prefix":"10.1186","volume":"1","author":[{"given":"Tunahan","family":"\u00c7ak\u0131r","sequence":"first","affiliation":[]},{"given":"Bet\u00fcl","family":"K\u0131rdar","sequence":"additional","affiliation":[]},{"given":"Z\u0130lsen","family":"\u00d6nsan","sequence":"additional","affiliation":[]},{"given":"Kutlu \u00d6","family":"\u00dclgen","sequence":"additional","affiliation":[]},{"given":"Jens","family":"Nielsen","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2007,3,27]]},"reference":[{"key":"18_CR1","doi-asserted-by":"publisher","first-page":"169","DOI":"10.1016\/S0014-5793(01)02613-8","volume":"500","author":"BH ter Kuile","year":"2001","unstructured":"ter Kuile BH, Westerhoff HV: Transcriptome meets metabolome: hierarchical and metabolic regulation of the glycolytic pathway. 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