The Ca(2+) -dependent response to oxidative stress caused by H(2)O(2) or tert-butylhydroperoxide (tBOOH) was investigated in Saccharomyces cerevisiae cells expressing transgenic cytosolic aequorin, a Ca(2+) -dependent photoprotein. Both H(2)O(2) and tBOOH induced an immediate and short-duration cytosolic Ca(2+) increase that depended on the concentration of the stressors. Sublethal doses of H(2)O(2) induced Ca(2+) entry into the cytosol from both extracellular and vacuolar sources, whereas lethal H(2)O(2) shock mobilized predominantly the vacuolar Ca(2+). Sublethal and lethal tBOOH shocks induced mainly the influx of external Ca(2+), accompanied by a more modest vacuolar contribution. Ca(2+) transport across the plasma membrane did not necessarily involve the activity of the Cch1p/Mid1p channel, whereas the release of vacuolar Ca(2+) into the cytosol required the vacuolar channel Yvc1p. In mutants lacking the Ca(2+) transporters, H(2)O(2) or tBOOH sensitivity correlated with cytosolic Ca(2+) overload. Thus, it appears that under H(2)O(2)-induced or tBOOH-induced oxidative stress, Ca(2+) mediates the cytotoxic effect of the stressors and not the adaptation process.
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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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