4NG2

Crystal structure of LasR LBD-QslA complex from Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.413 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

QsIA disrupts LasR dimerization in antiactivation of bacterial quorum sensing

Fan, H.Dong, Y.Wu, D.H.Bowler, M.W.Zhang, L.Song, H.

(2013) Proc.Natl.Acad.Sci.USA 110: 20765-20770

  • DOI: 10.1073/pnas.1314415110

  • PubMed Abstract: 
  • The human pathogen Pseudomonas aeruginosa coordinates the expression of virulence factors by using quorum sensing (QS), a signaling cascade triggered by the QS signal molecule and its receptor, a member of the LuxR family of QS transcriptional factor ...

    The human pathogen Pseudomonas aeruginosa coordinates the expression of virulence factors by using quorum sensing (QS), a signaling cascade triggered by the QS signal molecule and its receptor, a member of the LuxR family of QS transcriptional factors (LasR). The QS threshold and response in P. aeruginosa is defined by a QS LasR-specific antiactivator (QslA), which binds to LasR and prevents it from binding to its target promoter. However, how QslA binds to LasR and regulates its DNA binding activity in QS remains elusive. Here we report the crystal structure of QslA in complex with the N-terminal ligand binding domain of LasR. QsIA exists as a functional dimer to interact with the LasR ligand binding domain. Further analysis shows that QsIA binding occupies the LasR dimerization interface and consequently disrupts LasR dimerization, thereby preventing LasR from binding to its target DNA and disturbing normal QS. Our findings provide a structural model for understanding the QslA-mediated antiactivation mechanism in QS through protein-protein interaction.


    Organizational Affiliation

    Institute of Molecular and Cell Biology, Singapore 138673.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional activator protein LasR
A, B, C, D
184Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 0 
Gene Names: lasR
Find proteins for P25084 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  P25084
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein
E, F, G, H, I, J, K, L
113Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 0 
Find proteins for Q9I494 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  Q9I494
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OHN
Query on OHN

Download SDF File 
Download CCD File 
A, B, C, D
N-3-OXO-DODECANOYL-L-HOMOSERINE LACTONE
C16 H27 N O4
PHSRRHGYXQCRPU-AWEZNQCLSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
OHNEC50: 7 - 31 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.413 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.231 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 163.507α = 90.00
b = 185.887β = 90.00
c = 56.106γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXphasing
MOSFLMdata reduction
SCALAdata scaling
PHENIXrefinement
PHENIXmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-18
    Type: Initial release
  • Version 1.1: 2015-09-23
    Type: Database references