2G2K

NMR structure of an N-terminal fragment of the eukaryotic initiation factor 5 (eIF5)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 18 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the eukaryotic initiation factor (eIF) 5 reveals a fold common to several translation factors

Conte, M.R.Kelly, G.Babon, J.Sanfelice, D.Youell, J.Smerdon, S.J.Proud, C.G.

(2006) Biochemistry 45: 4550-4558

  • DOI: 10.1021/bi052387u

  • PubMed Abstract: 
  • Eukaryotic initiation factor 5 (eIF5) plays multiple roles in translation initiation. Its N-terminal domain functions as a GTPase-activator protein (GAP) for GTP bound to eIF2, while its C-terminal region nucleates the interactions between multiple t ...

    Eukaryotic initiation factor 5 (eIF5) plays multiple roles in translation initiation. Its N-terminal domain functions as a GTPase-activator protein (GAP) for GTP bound to eIF2, while its C-terminal region nucleates the interactions between multiple translation factors, including eIF1, which acts to inhibit GTP hydrolysis or P(i) release, and the beta subunit of eIF2. These proteins and the events in which they participate are critical for the accurate recognition of the correct start codon during translation initiation. Here, we report the three-dimensional solution structure of the N-terminal domain of human eIF5, comprising two subdomains, both reminiscent of nucleic-acid-binding modules. The N-terminal subdomain contains the "arginine finger" motif that is essential for GAP function but which, unusually, resides in a partially disordered region of the molecule. This implies that a conformational reordering of this portion of eIF5 is likely to occur upon formation of a competent complex for GTP hydrolysis, following the appropriate activation signal. Interestingly, the N-terminal subdomain of eIF5 reveals an alpha/beta fold structurally similar to both the archaeal orthologue of the beta subunit of eIF2 and, unexpectedly, to eIF1. These results reveal a novel protein fold common to several factors involved in related steps of translation initiation. The implications of these observations are discussed in terms of the mechanism of translation initiation.


    Organizational Affiliation

    Biophysics Laboratories, School of Biological Sciences, University of Portsmouth, Portsmouth PO1 2DT, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Eukaryotic translation initiation factor 5
A
170Homo sapiensMutation(s): 1 
Gene Names: EIF5
Find proteins for P55010 (Homo sapiens)
Go to Gene View: EIF5
Go to UniProtKB:  P55010
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 18 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2G2K Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance