In this study, we explore the hypothesis that some member of the mitochondrial carrier family has specific uncoupling activity that is responsible for the basal proton conductance of mitochondria. Twenty-seven of the 35 yeast mitochondrial carrier genes were independently disrupted in Saccharomyces cerevisiae. Six knockout strains did not grow on nonfermentable carbon sources such as lactate. Mitochondria were isolated from the remaining 21 strains, and their proton conductances were measured. None of the 21 carriers contributed significantly to the basal proton leak of yeast mitochondria. A possible exception was the succinate/fumarate carrier encoded by the Xc2 gene, but deletion of this gene also affected yeast growth and respiratory chain activity, suggesting a more general alteration in mitochondrial function. If a specific protein is responsible for the basal proton conductance of yeast mitochondria, its identity remains unknown.
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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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