A new search for mitochondrial respiratory deficient mutants (Mit-) has been undertaken in order to accumulate a large number of point mutations in the coding portions of cytochrome-c-oxidase catalytic subunits and cytochrome b. Therefore, a mitochondrial DNA which retains the exons and lacks all the introns of the cytochrome oxidase subunit I and of the cytochrome-b split genes has been introduced into a strain carrying a nuclear recessive mutation affecting the adenine-nucleotide translocator, the op1 mutation, which is known to prevent the accumulation of large deletion petite mutants and this was used as the parental strain. After a moderate MnCl2 mutagenesis in order to limit multiple mutations, 105 Mit- mutants were isolated from 15,000 mutagenised clones in Saccharomyces cerevisiae. Mutations were mapped to the three catalytic subunits encoding genes (COX1, COX2 and COX3) of the cytochrome-c oxidase (70 mutations) and to the cytochrome-b gene (15 mutations). More than 50% of the mutants tested still exhibited mitochondrial translation products (subunits I, II and III), suggesting that they carry a missense mutation, rather than a nonsense mutation which would normally have led to a truncated protein. Mutations in the COX1 gene were allocated to four different subregions corresponding to exons 4 and 8 or to groups of exons, exons 1, 2, 3 or exons 5, 6, 7. Seven missense monosubstitution mutations and two frameshift mutations were also identified. The amino acid changes of the missense mutations were located in the vicinity of the CuB-heme alpha 3 binuclear centre ligands.
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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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