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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Linder, P. Iost, I. De La Cruz, J. Kressler, D. |
| Description | Author Affiliation: de la Cruz J ( Département de Biochimie Médicale, CMU, 1, rue Michel Servet, 1211 Genève 4, Switzerland.); |
| Abstract | The translation initiation factor eIF4E mediates the binding of the small ribosomal subunit to the cap structure at the 5' end of the mRNA. In Saccharomyces cerevisiae, the cap-binding protein eIF4E is mainly associated with eIF4G, forming the cap-binding complex eIF4F. Other proteins are detected upon purification of the complex on cap-affinity columns. Among them is p20, a protein of unknown function encoded by the CAF20 gene. Here, we show a negative regulatory role for the p20 protein in translation initiation. Deletion of CAF20 partially suppresses mutations in translation initiation factors. Overexpression of the p20 protein results in a synthetic enhancement of translation mutation phenotypes. Similar effects are observed for mutations in the DED1 gene, which we have isolated as a multicopy suppressor of a temperature-sensitive eIF4E mutation. The DED1 gene encodes a putative RNA helicase of the DEAD-box family. The analyses of its suppressor activity, of polysome profiles of ded1 mutant strains, and of synthetic lethal interactions with different translation mutants indicate that the Ded1 protein has a role in translation initiation in S. cerevisiae. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 10 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Gene Expression Regulation, Fungal Genes, Suppressor Peptide Initiation Factors Metabolism Protein Biosynthesis RNA Nucleotidyltransferases RNA-Binding Proteins Saccharomyces Cerevisiae Cloning, Molecular DNA Primers Escherichia Coli Eukaryotic Initiation Factor-4E Genes, Fungal Genes, Lethal Mutagenesis Polymerase Chain Reaction Polyribosomes RNA Cap-Binding Proteins RNA Helicases Genetics Growth & Development Temperature Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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