Cited by 193RNA and protein synthesis mechanismsRNA modifications and cancerAdvanced Electron Microscopy Techniques and Applications

Structures of modified eEF2·80S ribosome complexes reveal the role of GTP hydrolysis in translocation

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Taylor, Derek J, Nilsson, Jakob, Merrill, A Rod, Andersen, Gregers Rom, Nissen, Poul, Frank, Joachim·2007·The EMBO Journal

Abstract

On the basis of kinetic data on ribosome protein synthesis, the mechanical energy for translocation of the mRNA-tRNA complex is thought to be provided by GTP hydrolysis of an elongation factor (eEF2 in eukaryotes, EF-G in bacteria). We have obtained cryo-EM reconstructions of eukaryotic ribosomes complexed with ADP-ribosylated eEF2 (ADPR-eEF2), before and after GTP hydrolysis, providing a structural basis for analyzing the GTPase-coupled mechanism of translocation. Using the ADP-ribosyl group as a distinct marker, we observe conformational changes of ADPR-eEF2 that are due strictly to GTP hydrolysis. These movements are likely representative of native eEF2 motions in a physiological context and are sufficient to uncouple the mRNA-tRNA complex from two universally conserved bases in the ribosomal decoding center (A1492 and A1493 in Escherichia coli) during translocation. Interpretation of these data provides a detailed two-step model of translocation that begins with the eEF2/EF-G binding-induced ratcheting motion of the small ribosomal subunit. GTP hydrolysis then uncouples the mRNA-tRNA complex from the decoding center so translocation of the mRNA-tRNA moiety may be completed by a head rotation of the small subunit.

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Authors
Taylor, D. J., Nilsson, J., Merrill, A. R., Andersen, G. R., Nissen, P., & Frank, J.
Affiliations
  • Wadsworth Center (US)
  • Aarhus University (DK)
  • University of Guelph (CA)
Corresponding author
Frank, Joachim
Venue
The EMBO Journal
Published
2007-04-19
Volume
26
Issue
9
Pages
2421-2431
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2086666821
Cited by
193
References
59
Citations by year
2026: 4 · 2025: 2 · 2024: 4 · 2023: 12 · 2022: 11 · 2021: 8 · 2020: 2 · 2019: 5 · 2018: 14 · 2017: 6 · 2016: 11 · 2015: 4 · 2014: 7 · 2013: 18 · 2012: 20
FWCI
7.03
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • Novo Nordisk
  • Novo Nordisk Fonden
  • Canadian Institutes of Health Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Structural Biology › Advanced Electron Microscopy Techniques and Applications
Keywords
elongation factor 2, GTP hydrolysis, ribosome translocation, ADP-ribosylation, elongation factors, 80S ribosome, head rotation, elongation factor G
MeSH terms
Adenosine Diphosphate, Ascomycota, Guanosine Triphosphate, Hydrolysis, Models, Molecular, Molecular Sequence Data, Ribosomes, RNA, Messenger, RNA, Transfer, Protein Structure, Tertiary, Cryoelectron Microscopy, Peptide Elongation Factor 2, Peptide Elongation Factor G, RNA Transport

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