Regulation of cellular Mg2+ by S. cerevisiae was investigated. The minimal concentration of Mg2+ that results in optimal growth of S. cerevisiae is about 30 microM and a half-maximum growth rate is attained at about 5 microM Mg2+. Since the plasma membrane has an electrical potential greater than 100 mV, passive equilibration of Mg2+ across the plasma membrane would provide sufficient cytosolic Mg2+ (0.1-1 mM). The total cellular Mg2+ of cells grown in synthetic medium containing 1 mM Mg2+ is about 400 nmol/mg protein, most of which is bound to polyphosphate, nucleic acids, and ATP. Total cellular Mg2+ decreases to about 80 nmol/mg protein as the Mg2+ in synthetic growth medium is reduced to 0.02 mM, but remains relatively constant in growth medium containing 1 to 100 mM Mg2+. Cells shifted into Mg(2+)-free medium continue to grow by utilizing the vacuolar Mg2+ stores. Mg(2+)-starved cells replenish vacuolar Mg2+ stores with a halftime of 30 min. following the addition of 1 mM Mg2+ to the growth medium. The data indicate that cytosolic Mg2+ is maintained by the regulation of Mg2+ fluxes across both the vacuolar and plasma membranes.
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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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