In silico and in vitro-guided identification of inhibitors of alkylquinolone-dependent quorum sensing in Pseudomonas aeruginosa

Soukarieh, Fadi and Oton, Eduard Vico and Dubern, Jean-Frédéric and Gomes, Janice and Halliday, Nigel and de Pilar Crespo, Maria and Ramírez-Prada, Jonathan and Insuasty, Braulio and Abonia, Rodrigo and Quiroga, Jairo and Heeb, Stephan and Williams, Paul and Stocks, Michael J. and Cámara, Miguel (2018) In silico and in vitro-guided identification of inhibitors of alkylquinolone-dependent quorum sensing in Pseudomonas aeruginosa. Molecules, 23 . p. 257. ISSN 1420-3049

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Abstract

Pseudomonas aeruginosa is a major opportunistic pathogen in cystic fibrosis, wound and nosocomial infections, posing a serious burden to public health, due to its antibiotic resistance. The P. aeruginosa Pseudomonas Quinolone System (pqs) quorum sensing system, driven by the activation of the transcriptional regulator, PqsR (MvfR) by alkylquinolone (AQ) signal molecules, is a key player in the regulation of virulence and a potential target for the development of novel antibacterial agents. In this study, we performed in silico docking analysis, coupled with screening using a P. aeruginosa mCTX::PpqsA-lux chromosomal promoter fusion, to identify a series of new PqsR antagonists. The hit compounds inhibited pyocyanin and alkylquinolone signal molecule production in P. aeruginosa PAO1-L and PA14 strains. The inhibitor Ia, which showed the highest activity in PA14, reduced biofilmformation in PAO1-L and PA14, increasing their sensitivity to tobramycin. Furthermore, the hepatic and plasma stabilities for these compounds were determined in both rat and human in vitro microsomal assays, to gain a further understanding of their therapeutic potential. This work has uncovered a new class of P. aeruginosa PqsR antagonists with potential for hit to lead optimisation in the search for quorum sensing inhibitors for future anti-infective drug discovery programs.

Item Type: Article
Keywords: Pseudomonas aeruginosa; PqsR; MvfR; Pseudomonas quinolone signal (PQS); alkylquinolone; quorum sensing inhibition
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Life Sciences
University of Nottingham, UK > Faculty of Science > School of Pharmacy
Identification Number: https://doi.org/10.3390/molecules23020257
Depositing User: Eprints, Support
Date Deposited: 29 Jan 2018 10:44
Last Modified: 02 Jul 2018 09:18
URI: http://eprints.nottingham.ac.uk/id/eprint/49377

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