1HK9

Crystal structure of the Hfq protein from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Sm-Like Proteins in Eubacteria: The Crystal Structure of the Hfq Protein from Escherichia Coli

Sauter, C.Basquin, J.Suck, D.

(2003) Nucleic Acids Res. 31: 4091

  • Also Cited By: 2Y90, 2YHT

  • PubMed Abstract: 
  • The Hfq protein was discovered in Escherichia coli in the early seventies as a host factor for the Qbeta phage RNA replication. During the last decade, it was shown to be involved in many RNA processing events and remote sequence homology indicated a ...

    The Hfq protein was discovered in Escherichia coli in the early seventies as a host factor for the Qbeta phage RNA replication. During the last decade, it was shown to be involved in many RNA processing events and remote sequence homology indicated a link to spliceosomal Sm proteins. We report the crystal structure of the E.coli Hfq protein showing that its monomer displays a characteristic Sm-fold and forms a homo-hexamer, in agreement with former biochemical data. Overall, the structure of the E.coli Hfq ring is similar to the one recently described for Staphylococcus aureus. This confirms that bacteria contain a hexameric Sm-like protein which is likely to be an ancient and less specialized form characterized by a relaxed RNA binding specificity. In addition, we identified an Hfq ortholog in the archaeon Methanococcus jannaschii which lacks a classical Sm/Lsm gene. Finally, a detailed structural comparison shows that the Sm-fold is remarkably well conserved in bacteria, Archaea and Eukarya, and represents a universal and modular building unit for oligomeric RNA binding proteins.


    Related Citations: 
    • The Sm-Like Hfq Protein Increases Oxys RNA Interaction with Target Mrnas
      Zhang, A.,Wassarman, K.M.,Ortega, J.,Steven, A.C.,Storz, G.
      (2002) Mol.Cell 9: 11
    • Characterization of Broadly Pleiotropic Phenotypes Caused by an Hfq Insertion Mutation in Escherichia Coli K-12
      Tsui, H.C.,Leung, H.C.,Winkler, M.E.
      (1994) Mol.Microbiol. 13: 35
    • Hfq: A Bacterial Sm-Like Protein that Mediates RNA-RNA Interaction
      Moller, T.,Franch, T.,Hojrup, P.,Keene, D.R.,Bachinger, H.P.,Brennan, R.G.,Valentin-Hansen, P.
      (2002) Mol.Cell 9: 23
    • Bacterial Proteins Required for Replication of Phage Q Ribonucleic Acid. Purification and Properties of Host Factor I, a Ribonucleic Acid-Binding Protein
      De Fernandez, M.T.F.,Hayward, W.S.,August, J.T.
      (1972) J.Biol.Chem. 247: 824
    • Structures of the Pleiotropic Translational Regulator Hfq and an Hfq-RNA Complex: A Bacterial Sm-Like Protein
      Schumacher, M.A.,Pearson, R.F.,Moller, T.,Valentin-Hansen, P.,Brennan, R.G.
      (2002) Embo J. 21: 3546


    Organizational Affiliation

    European Molecular Biology Laboratory, Structural and Computational Biology Programme, Meyerhofstrasse 1, D-69117 Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN HFQ
A, B, C, D, E, F
74Escherichia coli (strain K12)Gene Names: hfq
Find proteins for P0A6X3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6X3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.208 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 61.350α = 90.00
b = 61.350β = 90.00
c = 166.100γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
AMoREphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-07-24
    Type: Initial release
  • Version 1.1: 2011-07-07
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance