Hfq protein from Pseudomonas aeruginosa. High-salt crystals

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structure of Pseudomonas aeruginosa Hfq protein.

Nikulin, A.Stolboushkina, E.Perederina, A.Vassilieva, I.Blaesi, U.Moll, I.Kachalova, G.Yokoyama, S.Vassylyev, D.Garber, M.Nikonov, S.

(2005) Acta Crystallogr D Biol Crystallogr 61: 141-146

  • DOI: https://doi.org/10.1107/S0907444904030008
  • Primary Citation of Related Structures:  
    1U1S, 1U1T

  • PubMed Abstract: 

    The structure of the Hfq protein from Pseudomonas aeruginosa was determined using two different ionic conditions. In both cases the molecules formed identical hexameric rings, but some variations in the crystal packing were revealed. Hfq belongs to the family of Sm/LSm proteins, the members of which can form hexameric as well as heptameric rings. Comparative analysis of known structures of this protein family shows that the fragment of the Sm-fold responsible for oligomerization is strongly structurally conserved. In the heptameric ring, three conserved hydrogen bonds between beta-strands of adjacent molecules hold together the monomers, whereas in the hexameric rings of Hfq an additional conserved inaccessible hydrogen bond between neighbouring monomers is observed.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hfq protein
A, B, C, D, E
A, B, C, D, E, F
82Pseudomonas aeruginosaMutation(s): 0 
Gene Names: hfq
Find proteins for Q9HUM0 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HUM0 
Go to UniProtKB:  Q9HUM0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HUM0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.44α = 90
b = 72.35β = 90
c = 109.25γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Refinement description