Yeast U2 snRNA is transcribed by RNA polymerase II to generate a single non-polyadenylated transcript. A temperature-sensitive yeast strain carrying a disruption in RNT1, the gene encoding a homolog of RNase III, produces 3'-extended U2 that is polyadenylated. The U2 3'-flanking region contains a putative stem-loop that is recognized and cleaved at two sites by recombinant GST-Rnt1 protein in vitro. Removal of sequences comprising the stem-loop structure blocks cleavage in vitro and mimics the effects of Rnt1 depletion in vivo. Strains carrying a U2 gene lacking the Rnt1 cleavage site produce only polyadenylated U2 snRNA, and yet are not impaired in growth or splicing. The results suggest that eukaryotic RNase III may be a general factor in snRNA processing, and demonstrate that polyadenylation is not incompatible with snRNA function in yeast.
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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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