Like most eukaryotes, Saccharomyces cerevisiae cells contain a minor 5.8SL rRNA that, relative to the major 5.8SS species, carries several extra nucleotides at the 5'-end. The two species are produced by alternative pathways that differ in the events removing the 3'-terminal region of Internal Transcribed Spacer 1 from the 27SA2 pre-rRNA. Whereas the pathway leading to 5.8SS rRNA is well established, that producing the 5'-end of 5.8SL (called B1L) is poorly understood. Northern analysis of two different mutants of S. cerevisiae that overproduce 5.8SL rRNA revealed the presence of a fragment corresponding to the 3'-terminal region of Internal Transcribed Spacer 1 (ITS1) directly upstream from site B1L. Immunoprecipitation experiments showed this fragment to be associated with the trans-acting factor Rrp5p required for processing at the early sites A0-A3. Together these data clearly support that the 5'-end of 5.8SL rRNA is an endonucleolytic event. In vivo mutational analysis demonstrated the lack of any cis-acting sequence elements directing this cleavage within ITS1.
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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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