1G7R

X-RAY STRUCTURE OF TRANSLATION INITIATION FACTOR IF2/EIF5B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.243 

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This is version 1.4 of the entry. See complete history


Literature

X-Ray structures of the universal translation initiation factor IF2/eIF5B: conformational changes on GDP and GTP binding.

Roll-Mecak, A.Cao, C.Dever, T.E.Burley, S.K.

(2000) Cell 103: 781-792

  • DOI: 10.1016/s0092-8674(00)00181-1
  • Primary Citation of Related Structures:  
    1G7T, 1G7S, 1G7R

  • PubMed Abstract: 
  • X-ray structures of the universal translation initiation factor IF2/eIF5B have been determined in three states: free enzyme, inactive IF2/eIF5B.GDP, and active IF2/eIF5B.GTP. The "chalice-shaped" enzyme is a GTPase that facilitates ribosomal subunit joining and Met-tRNA(i) binding to ribosomes in all three kingdoms of life ...

    X-ray structures of the universal translation initiation factor IF2/eIF5B have been determined in three states: free enzyme, inactive IF2/eIF5B.GDP, and active IF2/eIF5B.GTP. The "chalice-shaped" enzyme is a GTPase that facilitates ribosomal subunit joining and Met-tRNA(i) binding to ribosomes in all three kingdoms of life. The conserved core of IF2/eIF5B consists of an N-terminal G domain (I) plus an EF-Tu-type beta barrel (II), followed by a novel alpha/beta/alpha-sandwich (III) connected via an alpha helix to a second EF-Tu-type beta barrel (IV). Structural comparisons reveal a molecular lever, which amplifies a modest conformational change in the Switch 2 region of the G domain induced by Mg(2+)/GTP binding over a distance of 90 A from the G domain active center to domain IV. Mechanisms of GTPase function and ribosome binding are discussed.


    Organizational Affiliation

    Laboratories of Molecular Biophysics The Rockefeller University 10021, New York, NY 10021, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRANSLATION INITIATION FACTOR IF2/EIF5BA594Methanothermobacter thermautotrophicusMutation(s): 19 
UniProt
Find proteins for O26359 (Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H))
Explore O26359 
Go to UniProtKB:  O26359
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.243 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.316α = 104.9
b = 54.355β = 101.33
c = 90.978γ = 98.75
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-02-14
    Changes: Experimental preparation
  • Version 1.4: 2021-02-03
    Changes: Database references, Derived calculations, Structure summary