In an effort to identify genes involved in the excision of tRNA introns in Saccharomyces cerevisiae, temperature-sensitive mutants were screened for intracellular accumulation of intron-containing tRNA precursors by RNA hybridization analysis. In one mutant, tRNA splicing intermediates consisting of the 5' exon covalently joined to the intron ('2/3' pre-tRNA molecules) were detected in addition to unspliced precursors. The mutant cleaves pre-tRNA(Phe) in vitro at the 3' exon/intron splice site, generating the 3' half molecule and 2/3 intermediate. The 5' half molecule and intron are not produced, indicating that cleavage at the 5' splice site is suppressed. This partial splicing activity co-purifies with tRNA endonuclease throughout several chromatographic steps. Surprisingly, the splicing defect does not appreciably affect cell growth at normal or elevated temperatures, but does confer a pseudo cold-sensitive phenotype of retarded growth at 15 degrees C. The mutant falls into the complementation group SEN2 previously defined by the isolation of mutants defective for tRNA splicing in vitro [Winey, M. and Culbertson, M.R. (1988) Genetics, 118, 609-617], although its phenotypes are distinct from those of the previous sen2 isolates. The distinguishing genetic and biochemical properties of this new allele, designated sen2-3, suggests the direct participation of the SEN2 gene product in tRNA endonuclease function.
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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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