The structure of ligand binding domain of LasR in complex with TP-1 homolog, compound 14

Experimental Data Snapshot

  • Resolution: 1.63 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 

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Structural and Biochemical Studies of Non-native Agonists of the LasR Quorum-Sensing Receptor Reveal an L3 Loop "Out" Conformation for LasR.

O'Reilly, M.C.Dong, S.H.Rossi, F.M.Karlen, K.M.Kumar, R.S.Nair, S.K.Blackwell, H.E.

(2018) Cell Chem Biol 25: 1128-1139.e3

  • DOI: https://doi.org/10.1016/j.chembiol.2018.06.007
  • Primary Citation of Related Structures:  
    6D6A, 6D6B, 6D6C, 6D6D, 6D6L, 6D6M, 6D6N, 6D6O, 6D6P

  • PubMed Abstract: 

    Chemical strategies to block quorum sensing (QS) could provide a route to attenuate virulence in bacterial pathogens. Considerable research has focused on this approach in Pseudomonas aeruginosa, which uses the LuxR-type receptor LasR to regulate much of its QS network. Non-native ligands that antagonize LasR have been developed, yet we have little understanding of the mode by which these compounds interact with LasR and alter its function, as the receptor is unstable in their presence. Herein, we report an approach to circumvent this challenge through the study of a series of synthetic LasR agonists with varying levels of potency. Structural investigations of these ligands with the LasR ligand-binding domain reveal that certain agonists can enforce a conformation that deviates from that observed for other, often more potent agonists. These results, when combined with cell-based and biophysical analyses, suggest a functional model for LasR that could guide future ligand design.

  • Organizational Affiliation

    Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA. Electronic address: blackwell@chem.wisc.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional activator protein LasR
A, B, C, D
170Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: lasRPA1430
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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP25084
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.63 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.12α = 90
b = 84.55β = 101.09
c = 76.99γ = 90
Software Package:
Software NamePurpose
UCSD-systemdata processing
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-08
    Type: Initial release
  • Version 1.1: 2018-10-03
    Changes: Data collection, Database references