Structure of the nine-bladed beta-propeller of eIF3b

Experimental Data Snapshot

  • Resolution: 2.72 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

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Translation initiation factor eIF3b contains a nine-bladed beta-propeller and interacts with the 40S ribosomal subunit

Liu, Y.Neumann, P.Kuhle, B.Monecke, T.Schell, S.Chari, A.Ficner, R.

(2014) Structure 22: 923-930

  • DOI: https://doi.org/10.1016/j.str.2014.03.010
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The multisubunit eukaryotic translation initiation factor 3, among which the subunit b (eIF3b) is a major scaffold protein, plays essential roles in protein synthesis. Here, we report the crystal structure of the WD40 domain of Chaetomium thermophilum eIF3b, revealing a nine-bladed β-propeller fold. Sequence analysis indicates that this propeller architecture is common to all eIF3b orthologs. Revisiting the cryoelectron microscopy (cryo-EM) map of the 43S preinitiation complex suggests an interaction of the eIF3b with the 40S ribosomal subunit involving the ribosomal protein S9e and the 18S rRNA. This model is strongly supported by the direct binding of eIF3b to 40S ribosomes and to the isolated ribosomal protein rpS9e in vitro.

  • Organizational Affiliation

    Department of Molecular Structural Biology, Institute for Microbiology and Genetics, GZMB, Georg-August-University Göttingen, 37077 Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 3 subunit B746Thermochaetoides thermophila DSM 1495Mutation(s): 0 
Gene Names: PRT1CTHT_0000230
Find proteins for G0RXS6 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Explore G0RXS6 
Go to UniProtKB:  G0RXS6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG0RXS6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.72 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.38α = 90
b = 108.38β = 90
c = 172.18γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-09-17
    Type: Initial release
  • Version 1.1: 2014-10-01
    Changes: Structure summary
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Derived calculations