2PFB

Structure of oxidized OhrR from Xanthamonas campestris


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 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:  

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional regulator OhrR
A, B
153Xanthomonas campestris pv. phaseoliMutation(s): 1 
Gene Names: ohrR
Find proteins for Q93R11 (Xanthomonas campestris pv. phaseoli)
Go to UniProtKB:  Q93R11
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.219 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 61.140α = 90.00
b = 98.260β = 90.00
c = 88.890γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CrystalCleardata collection
PDB_EXTRACTdata extraction
d*TREKdata reduction
d*TREKdata scaling
CNSrefinement
PHASERphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.2: 2017-10-18
    Type: Refinement description