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Visualization of the eEF2-80S ribosome transition-state complex by cryo-electron microscopy

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  • Jakob Nilsson, Danmark
  • Jayati Sengupta, New York State University, USA
  • Richard Gursky, New York State University, USA
  • Morten Kjeldgaard
  • Poul Nissen
  • Joachim Frank, Columbia University, USA
  • Center for Bioinformatik (BiRC)
  • Interdisciplinary Nanoscience Center
  • Molekylærbiologisk Institut
In an attempt to understand ribosome-induced GTP hydrolysis on eEF2, we determined a 12.6-A cryo-electron microscopy reconstruction of the eEF2-bound 80S ribosome in the presence of aluminum tetrafluoride and GDP, with aluminum tetrafluoride mimicking the gamma-phosphate during hydrolysis. This is the first visualization of a structure representing a transition-state complex on the ribosome. Tight interactions are observed between the factor's G domain and the large ribosomal subunit, as well as between domain IV and an intersubunit bridge. In contrast, some of the domains of eEF2 implicated in small subunit binding display a large degree of flexibility. Furthermore, we find support for a transition-state model conformation of the switch I region in this complex where the reoriented switch I region interacts with a conserved rRNA region of the 40S subunit formed by loops of the 18S RNA helices 8 and 14. This complex is structurally distinct from the eEF2-bound 80S ribosome complexes previously reported, and analysis of this map sheds light on the GTPase-coupled translocation mechanism.
OriginalsprogEngelsk
TidsskriftJournal of Molecular Biology
Vol/bind382
Nummer1
Sider (fra-til)179-187
ISSN0022-2836
StatusUdgivet - 2008

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