3SZT

Quorum Sensing Control Repressor, QscR, Bound to N-3-oxo-dodecanoyl-L-Homoserine Lactone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of QscR, a Pseudomonas aeruginosa quorum sensing signal receptor.

Lintz, M.J.Oinuma, K.Wysoczynski, C.L.Greenberg, E.P.Churchill, M.E.

(2011) Proc.Natl.Acad.Sci.USA 108: 15763-15768

  • DOI: 10.1073/pnas.1112398108

  • PubMed Abstract: 
  • Acyl-homoserine lactone (AHL) quorum sensing controls gene expression in hundreds of Proteobacteria including a number of plant and animal pathogens. Generally, the AHL receptors are members of a family of related transcription factors, and although ...

    Acyl-homoserine lactone (AHL) quorum sensing controls gene expression in hundreds of Proteobacteria including a number of plant and animal pathogens. Generally, the AHL receptors are members of a family of related transcription factors, and although they have been targets for development of antivirulence therapeutics there is very little structural information about this class of bacterial receptors. We have determined the structure of the transcription factor, QscR, bound to N-3-oxo-dodecanoyl-homoserine lactone from the opportunistic human pathogen Pseudomonas aeruginosa at a resolution of 2.55 Å. The ligand-bound QscR is a dimer with a unique symmetric "cross-subunit" arrangement containing multiple dimerization interfaces involving both domains of each subunit. The QscR dimer appears poised to bind DNA. Predictions about signal binding and dimerization contacts were supported by studies of mutant QscR proteins in vivo. The acyl chain of the AHL is in close proximity to the dimerization interfaces. Our data are consistent with an allosteric mechanism of signal transmission in the regulation of DNA binding and thus virulence gene expression.


    Organizational Affiliation

    Department of Pharmacology, Structural Biology and Biophysics Program, University of Colorado Denver School of Medicine, Aurora, CO 80045, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Quorum-sensing control repressor
A, B
237Pseudomonas aeruginosaMutation(s): 0 
Gene Names: phzR (qscR, sdiA_2)
Find proteins for Q9RMS5 (Pseudomonas aeruginosa)
Go to UniProtKB:  Q9RMS5
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
OHN
Query on OHN

Download SDF File 
Download CCD File 
A, B
N-3-OXO-DODECANOYL-L-HOMOSERINE LACTONE
C16 H27 N O4
PHSRRHGYXQCRPU-AWEZNQCLSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
OHNEC50: 22 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.223 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 94.862α = 90.00
b = 94.862β = 90.00
c = 104.953γ = 120.00
Software Package:
Software NamePurpose
JBluIce-EPICSdata collection
Blu-Icedata collection
PHASERphasing
SCALEPACKdata scaling
REFMACrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-28
    Type: Initial release
  • Version 1.1: 2011-10-05
    Type: Database references
  • Version 1.2: 2017-11-08
    Type: Refinement description