Quorum sensing-IN-9 (Compound 7d) inhibits quorum sensing in Pseudomonas aeruginosa by binding PqsR proteins. Quorum sensing-IN-9 inhibits the expression of quorum sensing systems related genes lasB, rhlA and pqsA, blocks the generation of virulence factors elastase , pyocyanin and rhamnolipid. Quorum sensing-IN-9 destorys the motility of P. aeruginosa , inhibits the biofilm formation, decreasing the virulence and pathogenicity of P. aeruginosa . Quorum sensing-IN-9 exhibits anti-infectious activity in Galleria mellonella larval model.
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