Mutants of Saccharomyces cerevisiae carrying defined lesions in the mitochondrial aap1 gene, coding for membrane subunit 8 of the H+-ATPase, have been investigated to examine the consequence of the mutations on the function and assembly of the enzyme complex. These include three mit- mutants, which cannot grow by oxidative metabolism due to their inability to synthesize full-length subunit 8, and three partial revertants of one of the mutants. The mutations in these strains have been previously characterized by DNA sequencing. The use of a monoclonal antibody to the beta subunit of the H+-ATPase as a probe of assembly defect revealed that the presence of subunit 8 is essential for the assembly of subunit 6 to the enzyme complex. Mitochondria isolated from the mit- mutants have negligible [32Pi]ATP exchange activity and they exhibited ATPase activity which is not sensitive to inhibition by oligomycin, indicating a defective membrane F0 sector. Normal assembly of subunit 8 (and subunit 6) was observed in the revertant strains, despite 8-9 amino-acid substitutions in the membrane-spanning region of the H+-ATPase subunit 8 in two of the strains. The assembled complex, however, exhibited reduced [32Pi]ATP exchange activity and low sensitivity to oligomycin, indicating that the product of the aap1 gene is a functional subunit of the mitochondrial H+-ATPase.
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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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