1Z91

x-ray crystal structure of apo-OhrRC15S in reduced form: MarR family protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of an OhrR-ohrA Operator Complex Reveals the DNA Binding Mechanism of the MarR Family.

Hong, M.Fuangthong, M.Helmann, J.D.Brennan, R.G.

(2005) Mol.Cell 20: 131-141

  • DOI: 10.1016/j.molcel.2005.09.013
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mechanisms by which Bacillus subtilis OhrR, a member of the MarR family of transcription regulators, binds the ohrA operator and is induced by oxidation of its lone cysteine residue by organic hydroperoxides to sulphenic acid are unknown. Here, w ...

    The mechanisms by which Bacillus subtilis OhrR, a member of the MarR family of transcription regulators, binds the ohrA operator and is induced by oxidation of its lone cysteine residue by organic hydroperoxides to sulphenic acid are unknown. Here, we describe the crystal structures of reduced OhrR and an OhrR-ohrA operator complex. To bind DNA, OhrR employs a chimeric winged helix-turn-helix DNA binding motif, which is composed of extended eukaryotic-like wings, prokaryotic helix-turn-helix motifs, and helix-helix elements. The reactivity of the peroxide-sensing cysteine is not modulated by proximal basic residues but largely by the positive dipole of helix alpha1. Induction originates from the alleviation of intersubunit steric clash between the sulphenic acid moieties of the oxidized sensor cysteines and nearby tyrosines and methionines. The structure of the OhrR-ohrA operator complex reveals the DNA binding mechanism of the entire MarR family and suggests a common inducer binding pocket.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, OR 97239, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Organic hydroperoxide resistance transcriptional regulator
A
147Bacillus subtilis (strain 168)Mutation(s): 1 
Gene Names: ohrR (ykmA)
Find proteins for O34777 (Bacillus subtilis (strain 168))
Go to UniProtKB:  O34777
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.223 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 55.355α = 90.00
b = 55.355β = 90.00
c = 77.242γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
SOLVEphasing
MOSFLMdata reduction
CNSrefinement
SCALAdata scaling
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model