1. Mitochondria of Saccharomyces cerevisiae contain two tRNA's that are acylated with threonine. The two isoaccepting species (tRNA1Thr and tRNA2Thr) can be separated by reversed-phase chromatography on RPC-5. 2. A cytoplasmic mutant has been isolated which lacks tRNA1Thr but has normal levels of tRNA2Thr. This mutation was previously shown to map between the oxi 1 and oxi 2 loci on mitochondrial DNA. 3. tRNA1Thr and tRNA2Thr hybridize to wild type mitochondrial but not nuclear DNA and are capable of partially competing with each other. Hybridization of each species to different segments of mitochondrial DNA isolated from p- clones indicate that there are two threonyl tRNA genes. One gene is located between oxi 1 and oxi 2 and codes for tRNA1Thr. The second gene codes for tRNA2Thr and is near the cap locus. 4. Binding assays to E. coli ribosomes indicate that tRNA2Thr recognizes the threonine triplet ACA and may also recognize the other three triplets but with a much lower efficiency. None of the four codons for threonine stimulate the binding of tRNA1Thr to the ribosomes.
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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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