The iron–sulphur protein RNase L inhibitor functions in translation termination
| Autor: | Claudia Baierlein, Sohail Khoshnevis, Carmen Rotte, Ralf Ficner, Heike Krebber, Thomas Gross |
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| Rok vydání: | 2010 |
| Předmět: |
0303 health sciences
Protein subunit EIF4A1 Biology Biochemistry Molecular biology Stop codon Eukaryotic translation initiation factor 4 gamma Cell biology 03 medical and health sciences 0302 clinical medicine Eukaryotic translation Eukaryotic initiation factor Genetics Initiation factor Release factor Molecular Biology 030217 neurology & neurosurgery 030304 developmental biology |
| Zdroj: | EMBO reports. 11:214-219 |
| ISSN: | 1469-3178 1469-221X |
| DOI: | 10.1038/embor.2009.272 |
| Popis: | The iron–sulphur (Fe–S)-containing RNase L inhibitor (Rli1) is involved in ribosomal subunit maturation, transport of both ribosomal subunits to the cytoplasm, and translation initiation through interaction with the eukaryotic initiation factor 3 (eIF3) complex. Here, we present a new function for Rli1 in translation termination. Through co-immunoprecipitation experiments, we show that Rli1 interacts physically with the translation termination factors eukaryotic release factor 1 (eRF1)/Sup45 and eRF3/Sup35 in Saccharomyces cerevisiae. Genetic interactions were uncovered between a strain depleted for Rli1 and sup35-21 or sup45-2. Furthermore, we show that downregulation of RLI1 expression leads to defects in the recognition of a stop codon, as seen in mutants of other termination factors. By contrast, RLI1 overexpression partly suppresses the read-through defects in sup45-2. Interestingly, we find that although the Fe–S cluster is not required for the interaction of Rli1 with eRF1 or its other interacting partner, Hcr1, from the initiation complex eIF3, it is required for its activity in translation termination; an Fe–S cluster mutant of RLI1 cannot suppress the read-through defects of sup45-2. |
| Databáze: | OpenAIRE |
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