6Z17

PqsR (MvfR) in complex with antagonist 6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.195 

Starting Models: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Novel quinazolinone inhibitors of the Pseudomonas aeruginosa quorum sensing transcriptional regulator PqsR.

Grossman, S.Soukarieh, F.Richardson, W.Liu, R.Mashabi, A.Emsley, J.Williams, P.Camara, M.Stocks, M.J.

(2020) Eur J Med Chem 208: 112778-112778

  • DOI: https://doi.org/10.1016/j.ejmech.2020.112778
  • Primary Citation of Related Structures:  
    6YZ3, 6Z07, 6Z17, 6Z5K

  • PubMed Abstract: 

    Rising numbers of cases of multidrug- and extensively drug-resistant Pseudomonas aeruginosa over recent years have created an urgent need for novel therapeutic approaches to cure potentially fatal infections. One such approach is virulence attenuation where anti-virulence compounds, designed to reduce pathogenicity without affording bactericidal effects, are employed to treat infections. P. aeruginosa uses the pqs quorum sensing (QS) system, to coordinate the expression of a large number of virulence determinants as well as bacterial-host interactions and hence represents an excellent anti-virulence target. We report the synthesis and identification of a new series of thiazole-containing quinazolinones capable of inhibiting PqsR, the transcriptional regulator of the pqs QS system. The compounds demonstrated high potency (IC 50  < 300 nM) in a whole-cell assay, using a mCTX:P pqsA -lux-based bioreporter for the P. aeruginosa PAO1-L and PA14 strains. Structural evaluation defined the binding modes of four analogues in the ligand-binding domain of PqsR through X-ray crystallography. Further work showed the ability of 6-chloro-3((2-pentylthiazol-4-yl)methyl)quinazolin-4(3H)-one (18) and 6-chloro-3((2-hexylthiazol-4-yl)methyl)quinazolin-4(3H)-one (19) to attenuate production of the PqsR-regulated virulence factor pyocyanin. Compounds 18 and 19 showed a low cytotoxic profile in the A549 human epithelial lung cell line making them suitable candidates for further pre-clinical evaluation.


  • Organizational Affiliation

    School of Pharmacy, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional regulator MvfRA [auth AAA]239Pseudomonas aeruginosa UCBPP-PA14Mutation(s): 0 
Gene Names: mvfRPA14_51340
UniProt
Find proteins for A0A0H2Z7A6 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore A0A0H2Z7A6 
Go to UniProtKB:  A0A0H2Z7A6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2Z7A6
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Q4W (Subject of Investigation/LOI)
Query on Q4W

Download Ideal Coordinates CCD File 
B [auth AAA]6-chloranyl-3-[(2-propan-2-yl-2,3-dihydro-1,3-thiazol-4-yl)methyl]quinazolin-4-one
C15 H16 Cl N3 O S
ZXMPGCMASPZREE-AWEZNQCLSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.195 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.266α = 90
b = 120.266β = 90
c = 115.038γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-16
    Type: Initial release
  • Version 1.1: 2020-09-23
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Derived calculations, Refinement description