A metabolic flux model was constructed for the yeast Saccharomyces cerevisiae comprising the most important reactions during anaerobic metabolism of xylose and glucose. The model was used to calculate the intracellular fluxes in a recombinant, xylose-utilizing strain of S. cerevisiae (TMB 3001) grown anaerobically in a defined medium at dilution rates of 0.03, 0.06, and 0.18 h(-1). The feed concentration was varied from 0 g/L xylose and 20 g/L glucose to a mixture of 15 g/L xylose and 5 g/L glucose, so that the total concentration of carbon source was kept at 20 g/L. The specific uptake of xylose increased with the xylose concentration in the feed and with increasing dilution rate. The excreted xylitol was less than half of the xylose consumed. With increasing xylose concentration in the feed, the fluxes in the pentose phosphate pathway increased, whereas the flux through glycolysis decreased. Under all cultivation conditions, nicotinamide adenine dinucleotide (NADH) was the preferred cofactor for xylose reductase. The model showed that the flux through the reaction from ribulose 5-phosphate to xylulose 5-phosphate was very low under all cultivation conditions.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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