The nuclear gene OXA1 is essential for respiratory growth in yeast. It codes for a chaperon-like protein, and has pleiotropic effects on the assembly of cytochrome c oxidase and ATP synthase of the mitochondrial respiratory chain. To study respiratory complex formation in plants, we have cloned a homolog of the yeast oxa1- in Arabidopsis thaliana, OXA1At, by functional complementation of a yeast oxa1- mutant. OXA1At is a single copy gene and appears to be constitutively expressed in A. thaliana. Although OXA1At encodes a protein sharing only 30% amino acid identity with the yeast Oxa1 protein, hydrophobic domains likely corresponding to trans-membrane domains are strictly conserved. Cytochrome spectra and measurements of respiratory activities show that replacement of the yeast Oxa1 protein with the A. thaliana homolog leads to correct assembly and activity of cytochrome c oxidase, but to partial restoration of ATPase activity. Our results suggest that the Oxa1At protein is essential for the respiratory complex assembly in A. thaliana, and that genes involved in mitochondrial multiprotein complex formation can be conserved between plants and other organisms.
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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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