N-alkylimidazole derivatives as potential inhibitors of quorum sensing in Pseudomonas aeruginosa

Caleb Nketia Mensah; Gilbert Boadu Ampomah; Jehoshaphat Oppong Mensah; Edward Ntim Gasu; Caleb Impraim Aboagye; Edmund Ekuadzi; Nathaniel Owusu Boadi; Lawrence Sheringham Borquaye

doi:10.1016/j.heliyon.2022.e12581

N-alkylimidazole derivatives as potential inhibitors of quorum sensing in Pseudomonas aeruginosa

Heliyon. 2022 Dec 25;8(12):e12581. doi: 10.1016/j.heliyon.2022.e12581. eCollection 2022 Dec.

Authors

Caleb Nketia Mensah¹, Gilbert Boadu Ampomah¹, Jehoshaphat Oppong Mensah¹, Edward Ntim Gasu^{1

2}, Caleb Impraim Aboagye¹, Edmund Ekuadzi^{2

3}, Nathaniel Owusu Boadi¹, Lawrence Sheringham Borquaye^{1

2}

Affiliations

¹ Department of Chemistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
² Central Laboratory, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
³ Department of Pharmacognosy, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

Abstract

Antimicrobial resistance is a threat to global public health. Microbial resistance is mediated by biofilm formation and virulence behavior during infection. Quorum sensing (QS), a cell-to-cell communication is frequently used by microbes to evade host immune systems. Inhibiting QS channels is a potential route to halt microbial activities and eliminate them. Imidazole has been shown to be a potent warhead in various antimicrobial agents. This study aims to evaluate alkyl-imidazole derivatives as potential inhibitors of QS and to explore the interactions of the compounds with LasR, a key protein in the QS machinery of Pseudomonas aeruginosa. The study revealed that imidazole derivatives with longer alkyl chains possessed better antimicrobial activities. Octylimidazole and decylimidazole emerged as compounds with better anti-virulence and biofilm inhibition properties while hexylimidazole showed the best inhibitory activity against Pseudomonas aeruginosa PAO1. The binding affinity of the compounds with LasR followed a similar trend as that observed in the QS inhibitory assays, suggesting that interaction with LasR may be important for QS inhibition.

Keywords: Biofilm inhibition; Imidazole derivatives; LasR; Pyocyanin; Virulence factor.