4D5N

Cryo-EM structures of ribosomal 80S complexes with termination factors and cricket paralysis virus IRES reveal the IRES in the translocated state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Cryo-Em of Ribosomal 80S Complexes with Termination Factors Reveals the Translocated Cricket Paralysis Virus Ires.

Muhs, M.Hilal, T.Mielke, T.Skabkin, M.A.Sanbonmatsu, K.Y.Pestova, T.V.Spahn, C.M.T.

(2015) Mol.Cell 57: 422

  • DOI: 10.1016/j.molcel.2014.12.016
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The cricket paralysis virus (CrPV) uses an internal ribosomal entry site (IRES) to hijack the ribosome. In a remarkable RNA-based mechanism involving neither initiation factor nor initiator tRNA, the CrPV IRES jumpstarts translation in the elongation ...

    The cricket paralysis virus (CrPV) uses an internal ribosomal entry site (IRES) to hijack the ribosome. In a remarkable RNA-based mechanism involving neither initiation factor nor initiator tRNA, the CrPV IRES jumpstarts translation in the elongation phase from the ribosomal A site. Here, we present cryoelectron microscopy (cryo-EM) maps of 80S⋅CrPV-STOP ⋅ eRF1 ⋅ eRF3 ⋅ GMPPNP and 80S⋅CrPV-STOP ⋅ eRF1 complexes, revealing a previously unseen binding state of the IRES and directly rationalizing that an eEF2-dependent translocation of the IRES is required to allow the first A-site occupation. During this unusual translocation event, the IRES undergoes a pronounced conformational change to a more stretched conformation. At the same time, our structural analysis provides information about the binding modes of eRF1 ⋅ eRF3 ⋅ GMPPNP and eRF1 in a minimal system. It shows that neither eRF3 nor ABCE1 are required for the active conformation of eRF1 at the intersection between eukaryotic termination and recycling.


    Organizational Affiliation

    Institut für Medizinische Physik und Biophysik, Charite - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC PEPTIDE CHAIN RELEASE FACTOR SUBUNIT 1
A
436Homo sapiensMutation(s): 0 
Gene Names: ETF1 (ERF1, RF1, SUP45L1)
Find proteins for P62495 (Homo sapiens)
Go to Gene View: ETF1
Go to UniProtKB:  P62495
Entity ID: 2
MoleculeChainsLengthOrganism
CRICKET PARALYSIS VIRUS IRES RNAX201Cricket paralysis virus
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-04
    Type: Initial release
  • Version 1.1: 2015-03-04
    Type: Database references
  • Version 2.0: 2017-08-30
    Type: Atomic model, Data collection, Derived calculations