3VU3

Crystal structure of the Hfq and catalase HPII complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Post-Transcriptional Regulator Hfq Binds Catalase HPII: Crystal Structure of the Complex

Yonekura, K.Watanabe, M.Kageyama, Y.Hirata, K.Yamamoto, M.Maki-Yonekura, S.

(2013) Plos One 8: e78216-e78216

  • DOI: 10.1371/journal.pone.0078216

  • PubMed Abstract: 
  • We report a crystal structure of Hfq and catalase HPII from Escherichia coli. The post-transcriptional regulator Hfq plays a key role in the survival of bacteria under stress. A small non-coding RNA (sRNA) DsrA is required for translation of the stat ...

    We report a crystal structure of Hfq and catalase HPII from Escherichia coli. The post-transcriptional regulator Hfq plays a key role in the survival of bacteria under stress. A small non-coding RNA (sRNA) DsrA is required for translation of the stationary phase sigma factor RpoS, which is the central regulator of the general stress response. Hfq facilitates efficient translation of rpoS mRNA, which encodes RpoS. Hfq helps in the function of other specific proteins involved in RNA processing, indicating its versatility in the cell. However, structural information regarding its interactions with partners is missing. Here we obtained crystals of Hfq and HPII complexes from cell lysates following attempts to overexpress a foreign membrane protein. HPII is one of two catalases in E. coli and its mRNA is transcribed by an RNA polymerase holoenzyme containing RpoS, which in turn is under positive control of small non-coding RNAs and of the RNA chaperone Hfq. This sigma factor is known to have a pronounced effect on the expression of HPII. The crystal structure reveals that a Hfq hexamer binds each subunit of a HPII tetramer. Each subunit of the Hfq hexamer exhibits a unique binding mode with HPII. The hexamer of Hfq interacts via its distal surface. The proximal and distal surfaces are known to specifically bind different sRNAs, and binding of HPII could affect Hfq function. Hfq-HPII complexation has no effect on catalase HPII activity.


    Organizational Affiliation

    Biostructural Mechanism Laboratory, RIKEN SPring-8 Center, Harima Institute, Sayo, Hyogo, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Catalase HPII
A
753Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: katE
EC: 1.11.1.6
Find proteins for P21179 (Escherichia coli (strain K12))
Go to UniProtKB:  P21179
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein hfq
C, D, E, F, G, H
102Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: hfq
Find proteins for P0A6X3 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6X3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.196 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 136.432α = 90.00
b = 159.009β = 90.00
c = 167.181γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-20
    Type: Initial release
  • Version 1.1: 2013-11-27
    Type: Database references, Derived calculations