RpoN-Dependent Direct Regulation of Quorum Sensing and the Type VI Secretion System in Pseudomonas aeruginosa PAO1

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Xiaolong Shao
  • Xiaoning Zhang
  • Yingchao Zhang
  • Miao Zhu
  • Pan Yang
  • Jian Yuan
  • Tianhong Zhou
  • Wei Wang
  • Haihua Liang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article numbere00205-18
Journal / PublicationJournal of Bacteriology
Volume200
Issue number16
Online published14 May 2018
Publication statusPublished - Aug 2018

Abstract

Pseudomonas aeruginosa is a Gram-negative opportunistic pathogen of humans, particularly those with cystic fibrosis. As a global regulator, RpoN controls a group of virulence-related factors and quorum sensing (QS) genes in P. aeruginosa. To further gain insights into the direct targets of RpoN in vivo, the present study focused on identifying the direct targets of RpoN regulation in QS and the type VI secretion system (T6SS). We performed a chromatin immunoprecipitation coupled to high-throughput sequencing (ChIP-seq) assay that identified 1,068 binding sites of RpoN, mostly including metabolic genes, a group of genes in QS (lasI, rhlI and pqsR) and the T6SS (hcpA and hcpB). The direct targets of RpoN have been verified by EMSA, lux-reporter assay, RT-qPCR and phenotypic detection. The ΔrpoN::Tc mutant resulted in the reduced production of pyocyanin, motility and proteolytic activity. However, the production of rhamnolipids and biofilm formation were higher in the ΔrpoN::Tc mutant than in the wild type. In summary, the results indicated that RpoN had direct and profound effects on QS and the T6SS.
IMPORTANCE As a global regulator, RpoN controls a wide range of biological pathways including virulence in P. aeruginosaPAO1. This work shows that RpoN plays critical and global roles in the regulation of bacterial pathogenicity and fitness. ChIP-seq provided a useful database to characterize additional functions and targets of RpoN in the future. The functional characterization of RpoN-mediated regulation will improve the current understanding of the regulatory network of quorum sensing and virulence in P. aeruginosa and other bacteria.

Research Area(s)

  • Pseudomonas aeruginosa, Quorum-sensing system, T6SS

Citation Format(s)

RpoN-Dependent Direct Regulation of Quorum Sensing and the Type VI Secretion System in Pseudomonas aeruginosa PAO1. / Shao, Xiaolong; Zhang, Xiaoning; Zhang, Yingchao et al.
In: Journal of Bacteriology, Vol. 200, No. 16, e00205-18, 08.2018.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review