Although the La autoantigen binds to the 3' ends of all nascent polymerase III transcripts, its function in vivo has long been unclear. Although S. cerevisiae cells lacking the La protein homolog Lhp1p are viable, cells containing a mutation that disrupts the anticodon stem of tRNA(Ser)CGA require Lhp1p for growth. We demonstrate that for the wild-type pre-tRNA(Ser)CGA and other pre-tRNAs, Lhp1p is required for the normal endonucleolytic removal of the 3' trailer sequence. In cells lacking Lhp1p, the 3' trailer is removed by exonuclease(s). Although maturation of the mutant pre-tRNA(Ser)CGA requires Lhp1p, introduction of a second mutation that restores base pairing eliminates the requirement. We propose that binding by Lhp1p stabilizes pre-tRNAs in conformations that allow the 3' endonucleolytic cleavage to occur.
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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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