Abstract
No-go decay (NGD) is a mRNA quality-control mechanism in eukaryotic cells that leads to degradation of mRNAs stalled during translational elongation. The key factors triggering NGD are Dom34 and Hbs1. We used cryo-EM to visualize NGD intermediates resulting from binding of the Dom34–Hbs1 complex to stalled ribosomes. At subnanometer resolution, all domains of Dom34 and Hbs1 were identified, allowing the docking of crystal structures and homology models. Moreover, the close structural similarity of Dom34 and Hbs1 to eukaryotic release factors (eRFs) enabled us to propose a model for the ribosome-bound eRF1–eRF3 complex. Collectively, our data provide structural insights into how stalled mRNA is recognized on the ribosome and how the eRF complex can simultaneously recognize stop codons and catalyze peptide release.
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Acknowledgements
We thank J. Musial for assistance in cloning, C. Ungewickell and J. Bürger (UltraStrukturNetzwerk Berlin) for assistance in cryo-EM data collection, S.W. Suh (Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul, Korea) for the gift of Dom34 and Hbs1 overexpression plasmids, K. Häussermann for assistance in cryo-EM data processing and D. Wilson for scientific discussions. This research was supported by grants from the Deutsche Forschungsgemeinschaft SFB594 and SFB646 (to R.B. and T.B.), SFB740 (to T.M.), by a Marie Curie international incoming fellowship within the Seventh European Community Framework Programme (to E.V.) and by the European Union and Senatsverwaltung für Wissenschaft, Forschung und Kultur Berlin (UltraStructureNetwork, Anwenderzentrum).
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T.B. collected, processed and analyzed all cryo-EM data and carried out docking and molecular interpretation; J.-P.A. provided models for S. cerevisiae ribosomal proteins; A.J. and A.M.A. provided models for S. cerevisiae ribosomal RNA; E.V. helped carry out molecular dynamics flexible fitting; H.S. did protein and RNC purifications, binding assays and northern blots; and B.A.M. cloned and purified the ΔN-Hbs1 protein. T.M. and O.B. assisted in cryo-EM data collection. T.B. and R.B. designed the study, analyzed data and wrote the paper. All authors discussed the results and commented on the manuscript.
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Becker, T., Armache, JP., Jarasch, A. et al. Structure of the no-go mRNA decay complex Dom34–Hbs1 bound to a stalled 80S ribosome. Nat Struct Mol Biol 18, 715–720 (2011). https://doi.org/10.1038/nsmb.2057
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DOI: https://doi.org/10.1038/nsmb.2057
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