The control of glycolytic flux in the yeast Saccharomyces cerevisiae was studied by using permeabilized cells. Cells were harvested from chemostat cultures and, after removal of the cell wall, nystatin was used to permeabilize the spheroplasts. By this method it is possible to study the performance and regulation of a complete and functional metabolic pathway and not only a single enzymatic step. The results showed that ATP has a strong negative effect on glycolytic activity affecting several of the glycolytic enzymes. However, the main targets for ATP inhibition was phosphofructokinase and pyruvate kinase. Phospofructokinase was inhibited by ATP concentrations starting at about 1-2 mM, while pyruvate kinase required ATP levels above 2.5 mM before any inhibition was visible. These ATP concentrations were in the same range as measured for nitrogen- and glucose-limited cells cultivated in chemostat cultures. Other potential candidates as enzymes susceptible to ATP inhibition included hexokinase and enolase. The ATP:ADP ratio, as well as trehalose-6-phosphate levels, did not seem to influence the glycolytic activity.
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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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