2AHO

Structure of the archaeal initiation factor eIF2 alpha-gamma heterodimer from Sulfolobus solfataricus complexed with GDPNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 

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This is version 1.4 of the entry. See complete history


Literature

Structural Switch of the gamma Subunit in an Archaeal aIF2alphagamma Heterodimer

Yatime, L.Mechulam, Y.Blanquet, S.Schmitt, E.

(2006) Structure 14: 119-128

  • DOI: https://doi.org/10.1016/j.str.2005.09.020
  • Primary Citation of Related Structures:  
    2AHO

  • PubMed Abstract: 

    Eukaryotic and archaeal initiation factors 2 (e/aIF2) are heterotrimeric proteins (alphabetagamma) supplying the small subunit of the ribosome with methionylated initiator tRNA. This study reports the crystallographic structure of an aIF2alphagamma heterodimer from Sulfolobus solfataricus bound to Gpp(NH)p-Mg(2+). aIF2gamma is in a closed conformation with the G domain packed on domains II and III. The C-terminal domain of aIF2alpha interacts with domain II of aIF2gamma. Conformations of the two switch regions involved in GTP binding are similar to those encountered in an EF1A:GTP:Phe-tRNA(Phe) complex. Comparison with the EF1A structure suggests that only the gamma subunit of the aIF2alphagamma heterodimer contacts tRNA. Because the alpha subunit markedly reinforces the affinity of tRNA for the gamma subunit, a contribution of the alpha subunit to the switch movements observed in the gamma structure is considered.


  • Organizational Affiliation

    Laboratoire de Biochimie, Unité Mixte de Recherche 7654, CNRS-Ecole Polytechnique, F-91128 Palaiseau cedex, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Translation initiation factor 2 gamma subunit414Saccharolobus solfataricusMutation(s): 0 
UniProt
Find proteins for Q980A5 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q980A5 
Go to UniProtKB:  Q980A5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ980A5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Translation initiation factor 2 alpha subunit266Saccharolobus solfataricusMutation(s): 0 
UniProt
Find proteins for Q97Z79 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97Z79 
Go to UniProtKB:  Q97Z79
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97Z79
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.6α = 90
b = 112.9β = 90
c = 194.1γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
PHASERphasing
CNSrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description