4FX0

Crystal structure of M. tuberculosis transcriptional regulator MosR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6981 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Oxidation-sensing Regulator (MosR) Is a New Redox-dependent Transcription Factor in Mycobacterium tuberculosis.

Brugarolas, P.Movahedzadeh, F.Wang, Y.Zhang, N.Bartek, I.L.Gao, Y.N.Voskuil, M.I.Franzblau, S.G.He, C.

(2012) J.Biol.Chem. 287: 37703-37712

  • DOI: 10.1074/jbc.M112.388611
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mycobacterium tuberculosis thrives in oxidative environments such as the macrophage. To survive, the bacterium must sense and adapt to the oxidative conditions. Several antioxidant defenses including a thick cell wall, millimolar concentrations of sm ...

    Mycobacterium tuberculosis thrives in oxidative environments such as the macrophage. To survive, the bacterium must sense and adapt to the oxidative conditions. Several antioxidant defenses including a thick cell wall, millimolar concentrations of small molecule thiols, and protective enzymes are known to help the bacterium withstand the oxidative stress. However, oxidation-sensing regulators that control these defenses have remained elusive. In this study, we report a new oxidation-sensing regulator, Rv1049 or MosR (M. tuberculosis oxidation-sensing regulator). MosR is a transcriptional repressor of the MarR family, which, similarly to Bacillus subtilis OhrR and Staphylococcus aureus MgrA, dissociates from DNA in the presence of oxidants, enabling transcription. MosR senses oxidation through a pair of cysteines near the N terminus (Cys-10 and Cys-12) that upon oxidation forms a disulfide bond. Disulfide formation rearranges a network of hydrogen bonds, which leads to a large conformational change of the protein and dissociation from DNA. MosR has been shown previously to play an important role in survival of the bacterium in the macrophage. In this study, we show that the main role of MosR is to up-regulate expression of rv1050 (a putative exported oxidoreductase that has not yet been characterized) in response to oxidants and propose that it is through this role that MosR contributes to the bacterium survival in the macrophage.


    Organizational Affiliation

    Department of Chemistry and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROBABLE TRANSCRIPTIONAL REPRESSOR PROTEIN
A, B
148Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh)Mutation(s): 0 
Find proteins for O53397 (Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh))
Go to UniProtKB:  O53397
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6981 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.231 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.998α = 90.00
b = 66.677β = 90.00
c = 79.089γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data collection
PHENIXmodel building
PHENIXphasing
HKL-2000data reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-07-02 
  • Released Date: 2012-09-26 
  • Deposition Author(s): Brugarolas, P., He, C.

Revision History 

  • Version 1.0: 2012-09-26
    Type: Initial release
  • Version 1.1: 2012-10-03
    Type: Database references
  • Version 1.2: 2012-11-21
    Type: Database references