1Q46

crystal structure of the eIF2 alpha subunit from saccharomyces cerevisia


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of the N-terminal region of the alpha subunit of translation initiation factor 2 (eIF2alpha) from Saccharomyces cerevisiae provides a view of the loop containing serine 51, the target of the eIF2alpha-specific kinases.

Dhaliwal, S.Hoffman, D.W.

(2003) J.Mol.Biol. 334: 187-195


  • PubMed Abstract: 
  • The alpha subunit of translation initiation factor 2 (eIF2alpha) is the target of specific kinases that can phosphorylate a conserved serine residue as part of a mechanism for regulating protein expression at the translational level in eukaryotes. Th ...

    The alpha subunit of translation initiation factor 2 (eIF2alpha) is the target of specific kinases that can phosphorylate a conserved serine residue as part of a mechanism for regulating protein expression at the translational level in eukaryotes. The structure of the 20 kDa N-terminal region of eIF2alpha from Saccharomyces cerevisiae was determined by X-ray crystallography at 2.5A resolution. In most respects, the structure is similar to that of the recently solved human eIF2alpha; the rather elongated protein contains a five-stranded antiparallel beta-barrel in its N-terminal region, followed by an almost entirely helical domain. The S.cerevisiae eIF2alpha lacks a disulfide bridge that is present in the homologous protein in humans and some of the other higher eukaryotes. Interestingly, a conserved loop consisting of residues 51-65 and containing serine 51, the putative phosphorylation site, is visible in the electron density maps of the S.cerevisiae eIF2alpha; most of this functionally important loop was not observed in the crystal structure of the human protein. This loop is relatively exposed to solvent, and contains two short 3(10) helices in addition to some extended structure. Serine 51 is located at the C-terminal end of one of the 3(10) helices and near several conserved positively charged residues. The side-chain of serine 51 is sufficiently exposed so that its phosphorylation would not necessitate a substantial change in the protein structure. The structures and relative positions of residues that have been implicated in kinase binding and in the interaction with guanine nucleotide exchange factor (eIF2B) are described.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
translation initiation factor 2 alpha subunit
A
175Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SUI2 (TIF211)
Find proteins for P20459 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P20459
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.218 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 94.009α = 90.00
b = 94.009β = 90.00
c = 81.198γ = 90.00
Software Package:
Software NamePurpose
CCP4phasing
CNSrefinement
SCALEPACKdata scaling
CCP4model building
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-10-28
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance