A broad range quorum sensing inhibitor working through sRNA inhibition

Tim H. Jakobsen, Anders N. Warming, Rebecca M. Vejborg, Joana A. Moscoso, Marc Stegger, Frederik Lorenzen, Morten T. Rybtke, Jens B. Andersen, Rico Petersen, Paal Skytt Andersen, Thomas Eiland Nielsen, Tim Tolker-Nielsen, Alain Filloux, Hanne Ingmer, Michael Givskov

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Abstract

For the last decade, chemical control of bacterial virulence has received considerable attention. Ajoene, a sulfur-rich molecule from garlic has been shown to reduce expression of key quorum sensing regulated virulence factors in the opportunistic pathogen Pseudomonas aeruginosa. Here we show that the repressing effect of ajoene on quorum sensing occurs by inhibition of small regulatory RNAs (sRNA) in P. aeruginosa as well as in Staphylococcus aureus, another important human pathogen that employs quorum sensing to control virulence gene expression. Using various reporter constructs, we found that ajoene lowered expression of the sRNAs RsmY and RsmZ in P. aeruginosa and the small dual-function regulatory RNA, RNAIII in S. aureus, that controls expression of key virulence factors. We confirmed the modulation of RNAIII by RNA sequencing and found that the expression of many QS regulated genes encoding virulence factors such as hemolysins and proteases were lowered in the presence of ajoene in S. aureus. Importantly, our findings show that sRNAs across bacterial species potentially may qualify as targets of anti-virulence therapy and that ajoene could be a lead structure in search of broad-spectrum compounds transcending the Gram negative-positive borderline.
Original languageEnglish
JournalScientific Reports
Volume7
Issue number1
Pages (from-to)9857
ISSN2045-2322
DOIs
Publication statusPublished - 2017

Bibliographical note

This article is licensed under a Creative Commons Attribution 4.0 International.

Keywords

  • Microbiology
  • Pathogenesis

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