Visualization of the Hybrid State of tRNA Binding Promoted by Spontaneous Ratcheting of the Ribosome

Xabier Agirrezabala, Jianlin Lei, Julie L. Brunelle, Rodrigo F. Ortiz-Meoz, Rachel Green, Joachim Frank

Research output: Contribution to journalArticlepeer-review

Abstract

A crucial step in translation is the translocation of tRNAs through the ribosome. In the transition from one canonical site to the other, the tRNAs acquire intermediate configurations, so-called hybrid states. At this stage, the small subunit is rotated with respect to the large subunit, and the anticodon stem loops reside in the A and P sites of the small subunit, while the acceptor ends interact with the P and E sites of the large subunit. In this work, by means of cryo-EM and particle classification procedures, we visualize the hybrid state of both A/P and P/E tRNAs in an authentic factor-free ribosome complex during translocation. In addition, we show how the repositioning of the tRNAs goes hand in hand with the change in the interplay between S13, L1 stalk, L5, H68, H69, and H38 that is caused by the ratcheting of the small subunit.

Original languageEnglish (US)
Pages (from-to)190-197
Number of pages8
JournalMolecular cell
Volume32
Issue number2
DOIs
StatePublished - Oct 24 2008

Keywords

  • RNA

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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