Saccharomyces cerevisiae strains lacking phosphoglucose isomerase (pgi1) cannot use the pentose phosphate (PP) pathway to oxidize glucose, which has been explained by the lack of mechanism for reoxidation of the NADPH surplus. Consistent with this, the defective growth on glucose of a ENYpgi1 strain can be partially restored by expressing the Escherichia coli transhydrogenase udhA. In this work it was found that growth of V5 (wine yeast-derived) and FY1679 (isogenic to S288C) pgi1 mutants is not rescued by expression of udhA. Moreover, the flux through the PP pathway of 11 S. cerevisiae strains from various origins was estimated, by calculating the ratio between the enzymatic activity of the G6PDH and HXK, placed at the glycolysis-PP pathway branch point. The results show that ENY.WA-1A exhibited the highest ratio (1.5-3-fold) and the highest G6PDH activity. Overexpression of ZWF1 encoding the G6PDH in V5pgi1udhA did not rescue growth on glucose, suggesting that steps downstream the G6PDH might limit the PP pathway in this strain. As a whole, these data highlight a great intraspecies diversity in the PP pathway capacity among S. cerevisiae strains and suggest that a low capacity may be the prime limiting factor in glucose oxidation through this pathway.
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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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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | 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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