The functional role and topographical orientation in the inner membrane of subunit VII, the ubiquinone-binding protein, of the cytochrome b-c1 complex of yeast mitochondria has been investigated. The apparent molecular weight of this subunit on sodium dodecyl sulfate-urea gels was calculated to be 15,500, while its amino acid composition was similar to that of the Q-binding proteins present in the cytochrome b-c1 complexes isolated from both beef heart and yeast mitochondria. The specific antibody obtained against subunit VII inhibited 30-47% of the ubiquinol-cytochrome c reductase activity in the isolated cytochrome b-c1 complex and in submitochondrial particles but had no effect on cytochrome c reductase activity in mitoplasts, mitochondria from which the outer membrane has been removed. Furthermore, the antibody against subunit VII strongly inhibited (74%) the reduction of cytochrome b by succinate in the presence of antimycin, an inhibitor of center i, but had no effect on cytochrome b reduction in the presence of myxothiazol, an inhibitor of center o. These results suggest that subunit VII, the Q-binding protein, is involved in electron transport at center o of the cytochrome b-c1 complex of the respiratory chain and that subunit VII is localized facing the matrix side of the inner mitochondrial membrane.
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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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