The regions of the large subunit ribosomal protein L25 from Saccharomyces cerevisiae responsible for nuclear localization of the protein were identified by constructing fusion genes encoding various segments of L25 linked to the amino terminus of beta-galactosidase. Indirect immunofluorescence of yeast cells expressing the fusions demonstrated that amino acid residues 1 to 17 as well as 18 to 41 of L25 promote import of the reporter protein into the nucleus. Both nuclear localization signal (NLS) sequences appear to consist of two distinct functional parts: one showed relatively weak nuclear targeting activity, whereas the other considerably enhances this activity but does not promote nuclear import by itself. Microinjection of in vitro prepared intact and N-terminally truncated L25 into Xenopus laevis oocytes demonstrated that the region containing the two NLS sequences is indeed required for efficient nuclear localization of the ribosomal protein. This conclusion was confirmed by complementation experiments using a yeast strain that conditionally expresses wild-type L25. The latter experiments also indicated that amino acid residues 1 to 41 of L25 are required for full functional activity of yeast 60 S ribosomal subunits. Yeast cells expressing forms of L25 that lack this region are viable, but show impaired growth and a highly abnormal cell morphology.
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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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