posted on 2019-11-04, 15:28authored byIvana Aleksic, Jelena Jeremic, Dusan Milivojevic, Tatjana Ilic-Tomic, Sandra Šegan, Mario Zlatović, Dejan M. Opsenica, Lidija Senerovic
Pseudomonas aeruginosa is a leading cause of nosocomial
infections that are becoming increasingly difficult to treat due to
the occurrence of antibiotic resistant strains. Since P. aeruginosa virulence is controlled through quorum sensing, small molecule treatments
inhibiting quorum sensing signaling pathways provide a promising therapeutic
option. Consequently, we synthesized a series of N-octaneamino-4-aminoquinoline derivatives to optimize this chemotype’s
antivirulence activity against P. aeruginosa via
inhibition of pyocyanin production. The most potent derivative, which
possesses a benzofuran substituent, provided effective inhibition
of pyocyanin production (IC50 = 12 μM), biofilm formation
(BFIC50 = 50 μM), and motility. Experimentally, the
compound’s activity is achieved through competitive inhibition
of PqsR, and structure–activity data were rationalized using
molecular docking studies.