4NG2

Crystal structure of LasR LBD-QslA complex from Pseudomonas aeruginosa

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.41 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.234 

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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 U S A 110: 20765-20770

  • DOI: 10.1073/pnas.1314415110
  • Primary Citation of Related Structures:  
    4NG2

  • 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 factors (LasR) ...

    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: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transcriptional activator protein LasRA, B, C, D184Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: lasR, PA1430
UniProt
Find proteins for P25084 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P25084 
Go to UniProtKB:  P25084
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized proteinE, F, G, H, I, J, K, L113Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA1244
UniProt
Find proteins for Q9I494 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I494 
Go to UniProtKB:  Q9I494
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OHN (Subject of Investigation/LOI)
Query on OHN
Download Ideal Coordinates CCD File 
M [auth A], N [auth B], O [auth C], P [auth D]N-3-OXO-DODECANOYL-L-HOMOSERINE LACTONE
C16 H27 N O4
PHSRRHGYXQCRPU-AWEZNQCLSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
OHN BindingDB:  4NG2 EC50: min: 1.5, max: 31 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.41 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.234 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 163.507α = 90
b = 185.887β = 90
c = 56.106γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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