1ND9

Solution Structure of the N-terminal Subdomain of Translation Initiation Factor IF2


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with acceptable covalent geometry,structures with favorable non-bond energy,structures with the least restraint violations,structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A conserved structural motif at the N terminus of bacterial translation initiation factor IF2

Laursen, B.S.Mortensen, K.K.Sperling-Petersen, H.U.Hoffman, D.W.

(2003) J Biol Chem 278: 16320-16328

  • DOI: 10.1074/jbc.M212960200
  • Primary Citation of Related Structures:  
    1ND9

  • PubMed Abstract: 
  • The 18-kDa Domain I from the N-terminal region of translation initiation factor IF2 from Escherichia coli was expressed, purified, and structurally characterized using multidimensional NMR methods. Residues 2-50 were found to form a compact subdomain containing three short beta-strands and three alpha-helices, folded to form a betaalphaalphabetabetaalpha motif with the three helices packed on the same side of a small twisted beta-sheet ...

    The 18-kDa Domain I from the N-terminal region of translation initiation factor IF2 from Escherichia coli was expressed, purified, and structurally characterized using multidimensional NMR methods. Residues 2-50 were found to form a compact subdomain containing three short beta-strands and three alpha-helices, folded to form a betaalphaalphabetabetaalpha motif with the three helices packed on the same side of a small twisted beta-sheet. The hydrophobic amino acids in the core of the subdomain are conserved in a wide range of species, indicating that a similarly structured motif is present at the N terminus of IF2 in many of the bacteria. External to the compact 50-amino acid subdomain, residues 51-97 are less conserved and do not appear to form a regular structure, whereas residues 98-157 form a helix containing a repetitive sequence of mostly hydrophilic amino acids. Nitrogen-15 relaxation rate measurements provide evidence that the first 50 residues form a well ordered subdomain, whereas other regions of Domain I are significantly more mobile. The compact subdomain at the N terminus of IF2 shows structural homology to the tRNA anticodon stem contact fold domains of the methionyl-tRNA and glutaminyl-tRNA synthetases, and a similar fold is also found in the B5 domain of the phenylalanine-tRNA synthetase. The results of the present work will provide guidance for the design of future experiments directed toward understanding the functional roles of this widely conserved structural domain within IF2.


    Organizational Affiliation

    Department of Molecular Biology, University of Aarhus, DK-8000 Aarhus, Denmark.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Translation initiation factor IF-2 A49Escherichia coliMutation(s): 0 
Gene Names: K12
Find proteins for P0A705 (Escherichia coli (strain K12))
Explore P0A705 
Go to UniProtKB:  P0A705
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with acceptable covalent geometry,structures with favorable non-bond energy,structures with the least restraint violations,structures with the lowest energy 
  • OLDERADO: 1ND9 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance