A combination of point mutations disrupting both stem 1 and stem 2 of U5 snRNA (U5AI) was found to confer a thermosensitive phenotype in vivo. In a strain expressing U5AI, pre-mRNA splicing was blocked before the first step through an inability of the mutant U5 snRNA to efficiently associate with the U4/U6 di-snRNP. Formation of early splicing complexes was not affected in extracts prepared from U5 snRNA mutant cells, while the capacity of these extracts to splice a pre-mRNA in vitro was greatly diminished. In addition, significant levels of a translation product derived from intron containing pre-mRNAs could be detected in vivo. The SSD1/SRK1 gene was identified as a multi-copy suppressor of the U5AI snRNA mutant. Single copy expression of SSD1/SRK1 was sufficient to suppress the thermosensitive phenotype, and high copy expression partially suppressed the splicing and U4/U6.U5 tri-snRNP assembly pheno-types. SSD1/SRK1 also suppressed thermosensitive mutations in the Prp18p and U1-70K proteins, while inhibiting growth of the cold sensitive U1-4U snRNA mutant at 30 degrees C. Thus we have identified SSD1/SRK1 as a general suppressor of splicing mutants.
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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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