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Cryo-EM of elongating ribosome with EF-Tu•GTP elucidates tRNA proofreading

Author

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  • Anna B. Loveland

    (University of Massachusetts Medical School)

  • Gabriel Demo

    (University of Massachusetts Medical School
    Masaryk University)

  • Andrei A. Korostelev

    (University of Massachusetts Medical School)

Abstract

Ribosomes accurately decode mRNA by proofreading each aminoacyl-tRNA that is delivered by the elongation factor EF-Tu1. To understand the molecular mechanism of this proofreading step it is necessary to visualize GTP-catalysed elongation, which has remained a challenge2–4. Here we use time-resolved cryogenic electron microscopy to reveal 33 ribosomal states after the delivery of aminoacyl-tRNA by EF-Tu•GTP. Instead of locking cognate tRNA upon initial recognition, the ribosomal decoding centre dynamically monitors codon–anticodon interactions before and after GTP hydrolysis. GTP hydrolysis enables the GTPase domain of EF-Tu to extend away, releasing EF-Tu from tRNA. The 30S subunit then locks cognate tRNA in the decoding centre and rotates, enabling the tRNA to bypass 50S protrusions during accommodation into the peptidyl transferase centre. By contrast, the decoding centre fails to lock near-cognate tRNA, enabling the dissociation of near-cognate tRNA both during initial selection (before GTP hydrolysis) and proofreading (after GTP hydrolysis). These findings reveal structural similarity between ribosomes in initial selection states5,6 and in proofreading states, which together govern the efficient rejection of incorrect tRNA.

Suggested Citation

  • Anna B. Loveland & Gabriel Demo & Andrei A. Korostelev, 2020. "Cryo-EM of elongating ribosome with EF-Tu•GTP elucidates tRNA proofreading," Nature, Nature, vol. 584(7822), pages 640-645, August.
    • Handle: RePEc:nat:nature:v:584:y:2020:i:7822:d:10.1038_s41586-020-2447-x
    DOI: 10.1038/s41586-020-2447-x
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    Citations

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    Cited by:

    1. Chris H. Hill & Lukas Pekarek & Sawsan Napthine & Anuja Kibe & Andrew E. Firth & Stephen C. Graham & Neva Caliskan & Ian Brierley, 2021. "Structural and molecular basis for Cardiovirus 2A protein as a viral gene expression switch," Nature Communications, Nature, vol. 12(1), pages 1-16, December.
    2. Christine E. Carbone & Anna B. Loveland & Howard B. Gamper & Ya-Ming Hou & Gabriel Demo & Andrei A. Korostelev, 2021. "Time-resolved cryo-EM visualizes ribosomal translocation with EF-G and GTP," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    3. Simon A. Fromm & Kate M. O’Connor & Michael Purdy & Pramod R. Bhatt & Gary Loughran & John F. Atkins & Ahmad Jomaa & Simone Mattei, 2023. "The translating bacterial ribosome at 1.55 Å resolution generated by cryo-EM imaging services," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    4. Sakshi Jain & Lukasz Koziej & Panagiotis Poulis & Igor Kaczmarczyk & Monika Gaik & Michal Rawski & Namit Ranjan & Sebastian Glatt & Marina V. Rodnina, 2023. "Modulation of translational decoding by m6A modification of mRNA," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    5. Valentyn Petrychenko & Bee-Zen Peng & Ana C. A. P. Schwarzer & Frank Peske & Marina V. Rodnina & Niels Fischer, 2021. "Structural mechanism of GTPase-powered ribosome-tRNA movement," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    6. Dylan Girodat & Hans-Joachim Wieden & Scott C. Blanchard & Karissa Y. Sanbonmatsu, 2023. "Geometric alignment of aminoacyl-tRNA relative to catalytic centers of the ribosome underpins accurate mRNA decoding," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    7. Ritwika S. Basu & Michael B. Sherman & Matthieu G. Gagnon, 2022. "Compact IF2 allows initiator tRNA accommodation into the P site and gates the ribosome to elongation," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    8. Timo Flügel & Magdalena Schacherl & Anett Unbehaun & Birgit Schroeer & Marylena Dabrowski & Jörg Bürger & Thorsten Mielke & Thiemo Sprink & Christoph A. Diebolder & Yollete V. Guillén Schlippe & Chris, 2024. "Transient disome complex formation in native polysomes during ongoing protein synthesis captured by cryo-EM," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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