6Z17 | pdb_00006z17

PqsR (MvfR) in complex with antagonist 6

• PDB DOI: https://doi.org/10.2210/pdb6Z17/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Pseudomonas aeruginosa UCBPP-PA14
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2020-05-12 Released: 2020-09-16 
• Deposition Author(s): Richardson, W.K., Emsley, J.
• Funding Organization(s): Wellcome Trust

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.15 Å
• R-Value Free: 
  0.241 (Depositor), 0.238 (DCC) 
• R-Value Work: 
  0.195 (Depositor), 0.197 (DCC) 

Starting Models: experimental

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

• PubMed: 32927392 
• DOI: https://doi.org/10.1016/j.ejmech.2020.112778
• Primary Citation 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.

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Organizational Affiliation: 
• School of Pharmacy, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK.
School of Life Sciences, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK; National Biofilms Innovation Centre, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK.
School of Pharmacy, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK; National Biofilms Innovation Centre, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK.
School of Pharmacy, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK; National Biofilms Innovation Centre, University of Nottingham Biodiscovery Institute, University Park, Nottingham, Nottinghamshire, NG7 2RD, UK. Electronic address: [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 27.07 kDa 
• Atom Count: 1,619 
• Modeled Residue Count: 203 
• Deposited Residue Count: 239 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcriptional regulator MvfR	A [auth AAA]	239	Pseudomonas aeruginosa UCBPP-PA14	Mutation(s): 0  Gene Names: mvfR, PA14_51340
UniProt
Find proteins for A0A0H2Z7A6 (Pseudomonas aeruginosa (strain UCBPP-PA14)) Explore A0A0H2Z7A6  Go to UniProtKB:  A0A0H2Z7A6

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
Q4W (Subject of Investigation/LOI)	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 (Depositor), 0.238 (DCC) 
• R-Value Work:  0.195 (Depositor), 0.197 (DCC) 

Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 120.266	α = 90
b = 120.266	β = 90
c = 115.038	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
DIALS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2020-09-16 
Deposition Author(s): Richardson, W.K., Emsley, J.

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Funding Organization	Location	Grant Number
Wellcome Trust	United Kingdom	--

Revision History  

• 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