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High-resolution structures of a thermophilic eukaryotic 80S ribosome reveal atomistic details of translocation

Author

Listed:
  • Miglė Kišonaitė

    (Biochemiezentrum der Universität Heidelberg (BZH), INF328)

  • Klemens Wild

    (Biochemiezentrum der Universität Heidelberg (BZH), INF328)

  • Karine Lapouge

    (Biochemiezentrum der Universität Heidelberg (BZH), INF328)

  • Thomas Ruppert

    (Zentrum für Molekulare Biologie der Universität Heidelberg, INF282)

  • Irmgard Sinning

    (Biochemiezentrum der Universität Heidelberg (BZH), INF328)

Abstract

Ribosomes are complex and highly conserved ribonucleoprotein assemblies catalyzing protein biosynthesis in every organism. Here we present high-resolution cryo-EM structures of the 80S ribosome from a thermophilic fungus in two rotational states, which due to increased 80S stability provide a number of mechanistic details of eukaryotic translation. We identify a universally conserved ‘nested base-triple knot’ in the 26S rRNA at the polypeptide tunnel exit with a bulged-out nucleotide that likely serves as an adaptable element for nascent chain containment and handover. We visualize the structure and dynamics of the ribosome protective factor Stm1 upon ribosomal 40S head swiveling. We describe the structural impact of a unique and essential m1acp3 Ψ 18S rRNA hyper-modification embracing the anticodon wobble-position for eukaryotic tRNA and mRNA translocation. We complete the eEF2-GTPase switch cycle describing the GDP-bound post-hydrolysis state. Taken together, our data and their integration into the structural landscape of 80S ribosomes furthers our understanding of protein biogenesis.

Suggested Citation

  • Miglė Kišonaitė & Klemens Wild & Karine Lapouge & Thomas Ruppert & Irmgard Sinning, 2022. "High-resolution structures of a thermophilic eukaryotic 80S ribosome reveal atomistic details of translocation," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-27967-9
    DOI: 10.1038/s41467-022-27967-9
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    Cited by:

    1. Marius A. Klein & Klemens Wild & Miglė Kišonaitė & Irmgard Sinning, 2024. "Methionine aminopeptidase 2 and its autoproteolysis product have different binding sites on the ribosome," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Yan Chen & Bin Tsai & Ningning Li & Ning Gao, 2022. "Structural remodeling of ribosome associated Hsp40-Hsp70 chaperones during co-translational folding," Nature Communications, Nature, vol. 13(1), pages 1-14, December.

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