Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 3 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 27.26 kDa 
• Atom Count: 1573 
• Modelled Residue Count: 183 
• Deposited Residue Count: 246 
• Unique protein chains: 1

3QWG

Crystal structure of EspRdelta10, C-terminal 10 amino acids deletion mutant of EspR transcription factor from Mycobacterium tuberculosis

• PDB DOI: 10.2210/pdb3QWG/pdb

• Classification: TRANSCRIPTION
• Organism(s): Mycobacterium tuberculosis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-02-28 Released: 2011-09-14 
• Deposition Author(s): Blasco, B., Pojer, F., Cole, S.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.99 Å
• R-Value Free: 0.236 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 

Literature

Atypical DNA recognition mechanism used by the EspR virulence regulator of Mycobacterium tuberculosis.

Blasco, B., Stenta, M., Alonso-Sarduy, L., Dietler, G., Peraro, M.D., Cole, S.T., Pojer, F.

(2011) Mol Microbiol 82: 251-264

• PubMed: 21883526 
• DOI: 10.1111/j.1365-2958.2011.07813.x
• Primary Citation of Related Structures:  
  3QF3, 3QWG, 3QYX


• PubMed Abstract: 
  

The human pathogen Mycobacterium tuberculosis requires the ESX-1 secretion system for full virulence. EspR plays a key role in ESX-1 regulation via direct binding and transcriptional activation of the espACD operon. Here, we describe the crystal structures of EspR, a C-terminally truncated form, EspRΔ10, as well as an EspR-DNA complex. EspR forms a dimer with each monomer containing an N-terminal helix-turn-helix DNA binding motif and an atypical C-terminal dimerization domain. Structural studies combined with footprinting experiments, atomic force microscopy and molecular dynamic simulations allow us to propose a model in which a dimer of EspR dimers is the minimal functional unit with two subunits binding two consecutive major grooves. The other two DNA binding domains are thus free to form higher-order oligomers and to bridge distant DNA sites in a cooperative way. These features are reminiscent of nucleoid-associated proteins and suggest a more general regulatory role for EspR than was previously suspected.

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Organizational Affiliation: 

Global Health Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ESX-1 secretion-associated regulator EspR	A, B	123	Mycobacterium tuberculosis	Mutation(s): 0  Gene Names: espR, MT3964, Rv3849
UniProt
Find proteins for P9WJB7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WJB7  Go to UniProtKB:  P9WJB7

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.99 Å
• R-Value Free: 0.236 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.46	α = 90
b = 55.37	β = 90
c = 76.55	γ = 90

Software Package:

Software Name	Purpose
XDS	data scaling
CCP4	model building
PHENIX	model building
PHENIX	refinement
XDS	data reduction
CCP4	phasing
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-02-28 
• Released Date: 2011-09-14 
Deposition Author(s): Blasco, B., Pojer, F., Cole, S.T.

Revision History  

• Version 1.0: 2011-09-14
  Type: Initial release
  
• Version 1.1: 2011-11-16
  Changes: Database references