The cytochrome b gene of Saccharomyces cerevisiae D273-10B was previously shown to be composed of three exons and two introns (Nobrega, F.G., and Tzagoloff, A. (1980) J. Biol. Chem. 255, 9828-9837). In the present study nuclear respiratory deficient mutants of this strain have been screened for defects in processing of the cytochrome b pre-mRNA. Fifteen independently isolated mutants lacking cytochrome b have been assigned to a single genetic complementation group (G36). Members of this complementation group are blocked in the excision of the second intervening sequence of cytochrome b and consequently are unable to produce the mature mRNA. The wild type gene defined by this class of mutants has been named CBP2. A recombinant plasmid with the CBP2 gene has been selected from a library of wild type nuclear DNA and further subcloned by transformation of a cbp2 mutant to respiratory competency. The smallest plasmid (pG36/T5) capable of complementing cbp2 mutants and of restoring their ability to complete processing of the cytochrome b pre-mRNA has a nuclear DNA fragment of 2.6 kilobase pairs inserted at the BamHI site of the yeast vector YEp13. The sequence of the cloned DNA fragment has revealed an 1890-nucleotide-long reading frame encoding a basic protein with a molecular weight of 74,000. Deletion analysis confirms that the entire reading frame is required for complementation of cbp2 mutants. This reading frame is proposed to code for the CBP2 gene product.
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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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