Crystal structure of oxidized CprK in complex with o-chlorophenolacetic acid

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 

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CprK Crystal Structures Reveal Mechanism for Transcriptional Control of Halorespiration.

Joyce, M.G.Levy, C.Pop, S.M.Biehl, B.D.Doukov, T.I.Ryter, J.M.Mazon, H.Smidt, H.van den Heuvel, R.H.Ragsdale, S.W.van der Oost, J.Leys, D.

(2006) J Biol Chem 281: 28318-28325

  • DOI: https://doi.org/10.1074/jbc.M602654200
  • Primary Citation of Related Structures:  
    2H6B, 2H6C

  • PubMed Abstract: 

    Halorespiration is a bacterial respiratory process in which haloorganic compounds act as terminal electron acceptors. This process is controlled at transcriptional level by CprK, a member of the ubiquitous CRP-FNR family. Here we present the crystal structures of oxidized CprK in presence of the ligand ortho-chlorophenolacetic acid and of reduced CprK in absence of this ligand. These structures reveal that highly specific binding of chlorinated, rather than the corresponding non-chlorinated, phenolic compounds in the NH(2)-terminal beta-barrels causes reorientation of these domains with respect to the central alpha-helix at the dimer interface. Unexpectedly, the COOH-terminal DNA-binding domains dimerize in the non-DNA binding state. We postulate the ligand-induced conformational change allows formation of interdomain contacts that disrupt the DNA domain dimer interface and leads to repositioning of the helix-turn-helix motifs. These structures provide a structural framework for further studies on transcriptional control by CRP-FNR homologs in general and of halorespiration regulation by CprK in particular.

  • Organizational Affiliation

    Manchester Interdisciplinary Biocentre, P. O. Box 88, Manchester, M60 1QD, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ChloroPhenol Reduction gene K
A, B
250Desulfitobacterium hafnienseMutation(s): 0 
Find proteins for Q8RPJ2 (Desulfitobacterium hafniense)
Explore Q8RPJ2 
Go to UniProtKB:  Q8RPJ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8RPJ2
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.437α = 90
b = 112.185β = 90
c = 119.495γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-07-04
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance