In an earlier study, the ATP10 gene of Saccharomyces cerevisiae was shown to code for an inner membrane protein required for assembly of the F(0) sector of the mitochondrial ATPase complex (Ackerman, S., and Tzagoloff, A. (1990) J. Biol. Chem. 265, 9952-9959). To gain additional insights into the function of Atp10p, we have analyzed a revertant of an atp10 null mutant that displays partial recovery of oligomycin-sensitive ATPase and of respiratory competence. The suppressor mutation in the revertant has been mapped to the OLI2 locus in mitochondrial DNA and shown to be a single base change in the C-terminal coding region of the gene. The mutation results in the substitution of a valine for an alanine at residue 249 of subunit 6 of the ATPase. The ability of the subunit 6 mutation to compensate for the absence of Atp10p implies a functional interaction between the two proteins. Such an interaction is consistent with evidence indicating that the C-terminal region with the site of the mutation and the extramembrane domain of Atp10p are both on the matrix side of the inner membrane. Subunit 6 has been purified from the parental wild type strain, from the atp10 null mutant, and from the revertant. The N-terminal sequences of the three proteins indicated that they all start at Ser(11), the normal processing site of the subunit 6 precursor. Mass spectral analysis of the wild type and mutants subunit 6 failed to reveal any substantive difference of the wild type and mutant proteins when the mass of the latter was corrected for Ala --> Val mutation. These data argue against a role of Atp10p in post-translational modification of subunit 6. Although post-translational modification of another ATPase subunit interacting with subunit 6 cannot be excluded, a more likely function for Atp10p is that it acts as a subunit 6 chaperone during F(0) assembly.
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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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