5K1H

eIF3b relocated to the intersubunit face to interact with eIF1 and below the eIF2 ternary-complex. from the structure of a partial yeast 48S preinitiation complex in closed conformation.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 2.1 of the entry. See complete history

Literature

eIF3 Peripheral Subunits Rearrangement after mRNA Binding and Start-Codon Recognition.

Simonetti, A.Brito Querido, J.Myasnikov, A.G.Mancera-Martinez, E.Renaud, A.Kuhn, L.Hashem, Y.

(2016) Mol.Cell 63: 206-217

  • DOI: 10.1016/j.molcel.2016.05.033
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • mRNA translation initiation in eukaryotes requires the cooperation of a dozen eukaryotic initiation factors (eIFs) forming several complexes, which leads to mRNA attachment to the small ribosomal 40S subunit, mRNA scanning for start codon, and accomm ...

    mRNA translation initiation in eukaryotes requires the cooperation of a dozen eukaryotic initiation factors (eIFs) forming several complexes, which leads to mRNA attachment to the small ribosomal 40S subunit, mRNA scanning for start codon, and accommodation of initiator tRNA at the 40S P site. eIF3, composed of 13 subunits, 8 core (a, c, e, f, h, l, k, and m) and 5 peripheral (b, d, g, i, and j), plays a central role during this process. Here we report a cryo-electron microscopy structure of a mammalian 48S initiation complex at 5.8 Å resolution. It shows the relocation of subunits eIF3i and eIF3g to the 40S intersubunit face on the GTPase binding site, at a late stage in initiation. On the basis of a previous study, we demonstrate the relocation of eIF3b to the 40S intersubunit face, binding below the eIF2-Met-tRNAi(Met) ternary complex upon mRNA attachment. Our analysis reveals the deep rearrangement of eIF3 and unravels the molecular mechanism underlying eIF3 function in mRNA scanning and timing of ribosomal subunit joining.


    Organizational Affiliation

    CNRS, Architecture et Réactivité de l'ARN UPR9002, Université de Strasbourg, 67084 Strasbourg, France. Electronic address: a.simonetti@ibmc-cnrs.unistra.fr.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Eukaryotic translation initiation factor 3 subunit B
B
576Homo sapiensMutation(s): 0 
Gene Names: EIF3B (EIF3S9)
Find proteins for P55884 (Homo sapiens)
Go to Gene View: EIF3B
Go to UniProtKB:  P55884
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
eIF3a C-terminal tail
A
54N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
A
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.9 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: 2016-07-13
    Type: Initial release
  • Version 1.1: 2016-08-03
    Type: Database references
  • Version 1.2: 2017-08-02
    Type: Data collection
  • Version 2.0: 2017-08-09
    Type: Advisory, Atomic model, Database references, Derived calculations, Polymer sequence, Source and taxonomy, Structure summary
  • Version 2.1: 2018-01-31
    Type: Database references