4TQC

The co-complex structure of the translation initiation factor eIF4E with the inhibitor 4EGI-1 reveals an allosteric mechanism for dissociating eIF4G

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.163 

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Literature

Structure of the eukaryotic translation initiation factor eIF4E in complex with 4EGI-1 reveals an allosteric mechanism for dissociating eIF4G.

Papadopoulos, E., Jenni, S., Kabha, E., Takrouri, K.J., Yi, T., Salvi, N., Luna, R.E., Gavathiotis, E., Mahalingam, P., Arthanari, H., Rodriguez-Mias, R., Yefidoff-Freedman, R., Aktas, B.H., Chorev, M., Halperin, J.A., Wagner, G.

(2014) Proc Natl Acad Sci U S A 111: E3187-E3195

  • DOI: 10.1073/pnas.1410250111
  • Primary Citation of Related Structures:  
    4TQB, 4TQC, 4TPW

  • PubMed Abstract: 

    • The interaction of the eukaryotic translation initiation factor eIF4E with the initiation factor eIF4G recruits the 40S ribosomal particle to the 5' end of mRNAs, facilitates scanning to the AUG start codon, and is crucial for eukaryotic translation of nearly all genes ...

    The interaction of the eukaryotic translation initiation factor eIF4E with the initiation factor eIF4G recruits the 40S ribosomal particle to the 5' end of mRNAs, facilitates scanning to the AUG start codon, and is crucial for eukaryotic translation of nearly all genes. Efficient recruitment of the 40S particle is particularly important for translation of mRNAs encoding oncoproteins and growth-promoting factors, which often harbor complex 5' UTRs and require efficient initiation. Thus, inhibiting the eIF4E/eIF4G interaction has emerged as a previously unpursued route for developing anticancer agents. Indeed, we discovered small-molecule inhibitors of this eIF4E/eIF4G interaction (4EGIs) that inhibit translation initiation both in vitro and in vivo and were used successfully in numerous cancer-biology and neurobiology studies. However, their detailed molecular mechanism of action has remained elusive. Here, we show that the eIF4E/eIF4G inhibitor 4EGI-1 acts allosterically by binding to a site on eIF4E distant from the eIF4G binding epitope. Data from NMR mapping and high-resolution crystal structures are congruent with this mechanism, where 4EGI-1 attaches to a hydrophobic pocket of eIF4E between β-sheet2 (L60-T68) and α-helix1 (E69-N77), causing localized conformational changes mainly in the H78-L85 region. It acts by unfolding a short 310-helix (S82-L85) while extending α-helix1 by one turn (H78-S82). This unusual helix rearrangement has not been seen in any previous eIF4E structure and reveals elements of an allosteric inhibition mechanism leading to the dislocation of eIF4G from eIF4E.

    Organizational Affiliation: 

    Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115; gerhard_wagner@hms.harvard.edu.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 4E A, B191Homo sapiensMutation(s): 0 
Gene Names: EIF4E, EIF4EL1, EIF4F
Find proteins for P06730 (Homo sapiens)
Explore P06730 
Go to UniProtKB:  P06730
NIH Common Fund Data Resources
PHAROS:  P06730
GTEx:  ENSG00000151247
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
34J
Query on 34J
Download Ideal Coordinates CCD File 
A
(2S)-3-(4-amino-3-nitrophenyl)-2-{2-[4-(3,4-dichlorophenyl)-1,3-thiazol-2-yl]hydrazinyl}propanoic acid
C18 H15 Cl2 N5 O4 S
XPSGVIWZSZWGCS-AWEZNQCLSA-N		 Ligand Interaction
M7G
Query on M7G
Download Ideal Coordinates CCD File 
A, B
7N-METHYL-8-HYDROGUANOSINE-5'-DIPHOSPHATE
C11 H19 N5 O11 P2
QQODJOAVWUWVHJ-KQYNXXCUSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.163 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.21α = 90
b = 73.64β = 74.92
c = 66.98γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2014-08-20
    Changes: Experimental preparation
  • Version 1.2: 2014-10-01
    Changes: Database references
  • Version 2.0: 2017-08-23
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy