An abundant yeast mitochondrial 40 kDa protein (p40) binds with high specificity to the 5'-untranslated region of cytochrome c oxidase subunit II (COX2) mRNA. Using mobility shift and competition assays, we show here that purified p40 complexes with the leaders of all eight mitochondrial mRNAs of Saccharomyces cerevisiae. The location of the protein binding site on the different leaders is not conserved with respect to the AUG start codon. In vitro RNA footprint and deletion experiments have been used to define the p40-binding site on the leaders of COX1 and ATP9 mRNAs. Nucleotides at, and near, a single stranded region are protected or exposed for DEPC modification by binding of p40 to these leaders. Removal of this region from the COX1 messenger shows that it is essential for the protein-RNA interaction. While no obvious sequence similarity can be detected between the single stranded regions in different leaders, a nearby helical segment is conserved. A consensus model for p40-RNA interactions is presented and the possible biological function of p40 is discussed.
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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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