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The plant compound rosmarinic acid induces a broad quorum sensing response in Pseudomonas aeruginosa PAO1
Author(s) -
Fernández Matilde,
CorralLugo Andrés,
Krell Tino
Publication year - 2018
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.14301
Subject(s) - quorum sensing , biology , rosmarinic acid , pseudomonas aeruginosa , mutant , gene , virulence , microbiology and biotechnology , rna interference , bacteria , gene expression , genetics , rna , biochemistry , antioxidant
Summary The interference of plant compounds with bacterial quorum sensing (QS) is a major mechanism through which plants and bacteria communicate. However, little is known about the modes of action and effects on signal integrity during this type of communication. We have recently shown that the plant compound rosmarinic acid (RA) specifically binds to the Pseudomonas aeruginosa RhlR QS receptor. To determine the effect of RA on expression patterns, we carried out global RNA‐seq analysis. The results show that RA induces the expression of 128 genes, amongst which many virulence factor genes. RA triggers a broad QS response because 88% of the induced genes are known to be controlled by QS, and because RA stimulated genes were found to be involved in all four QS signalling systems within P. aeruginosa . This finding was confirmed through the analysis of transcriptional fusions transferred to wt and a rhlI / lasI double mutant. RA did not induce gene expression in the rhlI / lasI / rhlR triple mutant indicating that the effects observed are due to the RA‐RhlR interaction. Furthermore, RA induced seven sRNAs that were all encoded in regions close to QS and/or RA induced genes. This work significantly enhances our understanding of plant bacteria interaction.