2PMD

The structures of aIF2gamma subunit from the archaeon Sulfolobus solfataricus in the GDP-bound form.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

New Insights into the Interactions of the Translation Initiation Factor 2 from Archaea with Guanine Nucleotides and Initiator tRNA.

Nikonov, O.Stolboushkina, E.Nikulin, A.Hasenohrl, D.Blasi, U.Manstein, D.J.Fedorov, R.Garber, M.Nikonov, S.

(2007) J Mol Biol 373: 328-336

  • DOI: 10.1016/j.jmb.2007.07.048
  • Primary Citation of Related Structures:  
    2PLF, 2PMD

  • PubMed Abstract: 
  • Heterotrimeric a/eIF2alphabetagamma (archaeal homologue of the eukaryotic translation initiation factor 2 with alpha, beta and gamma subunits) delivers charged initiator tRNA (tRNAi) to the small ribosomal subunit. In this work, we determined the structures of aIF2gamma from the archaeon Sulfolobus solfataricus in the nucleotide-free and GDP-bound forms ...

    Heterotrimeric a/eIF2alphabetagamma (archaeal homologue of the eukaryotic translation initiation factor 2 with alpha, beta and gamma subunits) delivers charged initiator tRNA (tRNAi) to the small ribosomal subunit. In this work, we determined the structures of aIF2gamma from the archaeon Sulfolobus solfataricus in the nucleotide-free and GDP-bound forms. Comparison of the free, GDP and Gpp(NH)p-Mg2+ forms of aIF2gamma revealed a sequence of conformational changes upon GDP and GTP binding. Our results show that the affinity of GDP to the G domain of the gamma subunit is higher than that of Gpp(NH)p. In analyzing a pyrophosphate molecule binding to domain II of the gamma subunit, we found a cleft that is very suitable for the acceptor stem of tRNA accommodation. It allows the suggestion of an alternative position for Met-tRNA i Met on the alphagamma intersubunit dimer, at variance with a recently published one. In the model reported here, the acceptor stem of the tRNAi is approximately perpendicular to that of tRNA in the ternary complex elongation factor Tu-Gpp(NH)p-tRNA. According to our analysis, the elbow and T stem of Met-tRNA i Met in this position should make extensive contact with the alpha subunit of aIF2. Thus, this model is in good agreement with experimental data showing that the alpha subunit of aIF2 is necessary for the stable interaction of aIF2gamma with Met-tRNA i Met.


    Organizational Affiliation

    Institute of Protein Research, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russian Federation. alik@vega.protres.ru



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Translation initiation factor 2 gamma subunitA, B415Saccharolobus solfataricusMutation(s): 0 
Gene Names: eif2g
EC: 3.6.5.3
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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GNP
Query on GNP

Download Ideal Coordinates CCD File 
D [auth A]PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
C10 H17 N6 O13 P3
UQABYHGXWYXDTK-UUOKFMHZSA-N
 Ligand Interaction
GDP
Query on GDP

Download Ideal Coordinates CCD File 
C [auth A],
H [auth B]
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
PPV
Query on PPV

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A],
I [auth B],
J [auth B],
E [auth A],
F [auth A],
G [auth A],
I [auth B],
J [auth B],
K [auth B]
PYROPHOSPHATE
H4 O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.06α = 90
b = 95.06β = 90
c = 165.67γ = 120
Software Package:
Software NamePurpose
XDSdata scaling
MOLREPphasing
CNSrefinement
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-11-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-01-24
    Changes: Structure summary