2PEX

Structure of reduced C22S OhrR from Xanthamonas Campestris


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Mechanism of Organic Hydroperoxide Induction of the Transcription Regulator OhrR.

Newberry, K.J.Fuangthong, M.Panmanee, W.Mongkolsuk, S.Brennan, R.G.

(2007) Mol Cell 28: 652-664

  • DOI: 10.1016/j.molcel.2007.09.016
  • Primary Citation of Related Structures:  
    2PEX, 2PFB

  • PubMed Abstract: 
  • The Xanthomonas campestris transcription regulator OhrR contains a reactive cysteine residue (C22) that upon oxidation by organic hydroperoxides (OHPs) forms an intersubunit disulphide bond with residue C127'. Such modification induces the expression ...

    The Xanthomonas campestris transcription regulator OhrR contains a reactive cysteine residue (C22) that upon oxidation by organic hydroperoxides (OHPs) forms an intersubunit disulphide bond with residue C127'. Such modification induces the expression of a peroxidase that reduces OHPs to their less toxic alcohols. Here, we describe the structures of reduced and OHP-oxidized OhrR, visualizing the structural mechanism of OHP induction. Reduced OhrR takes a canonical MarR family fold with C22 and C127' separated by 15.5 A. OHP oxidation results in the disruption of the Y36'-C22-Y47' interaction network and dissection of helix alpha5, which then allows the 135 degrees rotation and 8.2 A translation of C127', formation of the C22-C127' disulphide bond, and alpha6-alpha6' helix-swapped reconfiguration of the dimer interface. These changes result in the 28 degrees rigid body rotations of each winged helix-turn-helix motif and DNA dissociation. Similar effector-induced rigid body rotations are expected for most MarR family members.


    Related Citations: 
    • Novel organic hydroperoxide-sensing and responding mechanisms for OhrR, a major bacterial sensor and regulator of organic hydroperoxide stress.
      Panmanee, W., Vattanaviboon, P., Poole, L.B., Mongkolsuk, S.
      (2006) J Bacteriol 188: 1389

    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030-4009, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transcriptional regulator OhrRAB153Xanthomonas campestrisMutation(s): 1 
Gene Names: ohrR
Find proteins for Q93R11 (Xanthomonas campestris pv. phaseoli)
Explore Q93R11 
Go to UniProtKB:  Q93R11
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMT
Query on FMT

Download CCD File 
A, B
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.29α = 90
b = 77.79β = 90
c = 77.81γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
SOLVEphasing
RESOLVEphasing
CNSrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
d*TREKdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Derived calculations, Version format compliance