Eukaryotic translation initiation factor 5 (eIF5) interacts with the 40S ribosomal initiation complex (40S.eIF3.AUG.Met-tRNA(f).eIF2.GTP) to promote the hydrolysis of bound GTP. In Saccharomyces cerevisiae, eIF5, a protein of 45346Da, is encoded by a single-copy essential gene, TIF5. In this paper, we have isolated a temperature-sensitive S. cerevisiae strain, TMY5-1, by replacing the wild-type chromosomal copy of TIF5 with one mutagenized in vitro. The mutant yeast cells rapidly cease protein synthesis when grown under non-permissive conditions, lose polyribosomes and accumulate free 80S ribosomes. Further characterization of mutant eIF5 showed that the mutant protein, expressed in Escherichia coli, is defective both in its interaction with eIF2 as well as in mediating the hydrolysis of GTP bound to the 40S initiation complex and consequently in the formation of the 80S initiation complex. Additionally, the availability of a yeast strain containing temperature-sensitive mutation in the eIF5 gene allowed us to construct a cell-free translation system that was dependent on exogenously added eIF5 for translation of mRNAs in vitro.
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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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