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A novel extracytoplasmic function (ECF) sigma factor regulates virulence in Pseudomonas aeruginosa

ABSTRACT: Next to the two-component and quorum sensing systems, cell-surface signaling (CSS) has been recently identified as an important regulatory system in Pseudomonas aeruginosa. CSS senses signals from outside the cell and transmits them into the cytoplasm. It consists of a TonB-dependent outer membrane receptor, a cytoplasmic membrane-localized sigma factor regulator (or anti-sigma factor), and an extracytoplasmic function (ECF) sigma factor. Upon perception of the extracellular signal by the receptor the ECF sigma factor is activated and promotes the transcription of a specific set of gene(s). Although most P. aeruginosa ECF sigma factors are involved in the regulation of iron uptake, we have identified a novel ECF sigma factor (PA0675) involved in the regulation of virulence. By microarray analysis of cells overexpressing PA0675 from the pMUM3 plasmid we have identified the genes regulated by this sigma factor.

ORGANISM(S): Pseudomonas aeruginosa

PROVIDER: GSE15697 | GEO | 2009/04/21

SECONDARY ACCESSION(S): PRJNA116649

REPOSITORIES: GEO

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A novel extracytoplasmic function (ECF) sigma factor regulates virulence in Pseudomonas aeruginosa

Project description:Next to the two-component and quorum sensing systems, cell-surface signaling (CSS) has been recently identified as an important regulatory system in Pseudomonas aeruginosa. CSS senses signals from outside the cell and transmits them into the cytoplasm. It consists of a TonB-dependent outer membrane receptor, a cytoplasmic membrane-localized sigma factor regulator (or anti-sigma factor), and an extracytoplasmic function (ECF) sigma factor. Upon perception of the extracellular signal by the receptor the ECF sigma factor is activated and promotes the transcription of a specific set of gene(s). Although most P. aeruginosa ECF sigma factors are involved in the regulation of iron uptake, we have identified a novel ECF sigma factor (PA0675) involved in the regulation of virulence. By microarray analysis of cells overexpressing PA0675 from the pMUM3 plasmid we have identified the genes regulated by this sigma factor. Two different samples are analyzed namely P. aeruginosa (pMMB67EH) (control/reference sample) and P. aeruginosa (pMUM3) (overexpressing the PA0675 ECF sigma factor). Two different replicates per sample are included.

2009-04-21 | E-GEOD-15697 | biostudies-arrayexpress

Transcription profiling of Pseudomonas aeruginosa overexpressing the ECF sigmas PA0149, PA2050, PA2093 and PA4896 involved in cell-surface signaling systems

Project description:Cell-surface signaling is a sophisticated regulatory mechanism used by gram-negative bacteria to sense signals from outside the cell and transmit them into the cytoplasm. This regulatory system consists of an outer membrane-localized TonB-dependent receptor (TonB-dependent transducer), a cytoplasmic membrane-localized anti-sigma factor and an extracytoplasmic function (ECF) sigma factor. By microarray analysis we have identified the regulons of four novel P. aeruginosa signaling systems. For that, the ECF sigmas PA0149, PA2050, PA2093 and PA4896 have been overexpressed in P. aeruginosa and their target gene candidates have been identified using DNA microarray. Experiment Overall Design: Five different samples are analyzed namely P. aeruginosa (pMMB67EH) (control/reference sample), P. aeruginosa (pMMB-PA4896) (overexpressing the PA4896 ECF sigma factor), P. aeruginosa (pMMB-PA0149) (overexpressing the PA0149 ECF sigma factor), P. aeruginosa (pMMB-PA2050) (overexpressing the PA2050 ECF sigma factor), and P. aeruginosa (pMMB-PA2093) (overexpressing the PA2093 ECF sigma factor). Two different replicates are included for the three first samples and one for the two last samples.

2008-06-16 | E-GEOD-9657 | biostudies-arrayexpress

Characterization of five novel Pseudomonas aeruginosa cell-surface signaling systems

2007-11-24 | GSE9657 | GEO

Regulation of Energy Metabolism by the Extracytoplasmic Function (ECF) σ factors of Arcobacter butzleri

Project description:The extracytoplasmic function (ECF) σ factors are fundamental for bacterial adaptation to distinct environments and for survival under different stress conditions. The emerging pathogen Arcobacter butzleri possesses seven putative pairs of σ/anti-σ factors belonging to the ECF family. Here, we report the identification of the genes regulated by five out of the seven A. butzleri ECF σ factors. Three of the ECF σ factors play an apparent role in transport, energy generation and the maintainance of redox balance. Several genes like the nap, sox and tct genes are regulated by more than one ECF σ factor indicating that the A. butzleri ECF σ factors form a network of overlapping regulons. In contrast to other eubacteria, these A. butzleri ECF regulons appear to primarily regulate responses to changing environments in order to meet metabolic needs instead of an obvious role in stress adaptation.

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SigX ECF sigma factor deletion mutant expression profile in Pseudomonas aeruginosa in M9 minimal medium (M9G)

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SigX ECF sigma factor deletion mutant expression profile in Pseudomonas aeruginosa in M9 minimal medium (M9G)

Project description:Analysis of a SigX knockout mutant of Pseudomonas aeruginosa H103 strain in minimal medium with glucose as carbon source (M9G). SigX, one of the 19 extra-cytoplasmic function sigma factors of P. aeruginosa, was only known to be involved in transcription of the gene encoding the major outer membrane protein OprF in Pseudomonas aeruginosa. Deletion of the ECF sigma factor sigX gene provide insights into the SigX role in several virulence and biofilm- related phenotypes in Pseudomonas aeruginosa. To better understand the cellular function of SigX, a deletion mutant of the sigX gene (PAOSX) was generated and its expression profile was compared with parental strain Pseudomonas aeruginosa H103. To this end, H103 and a sigX mutant were cultured in M9G, in which their growth are similar. Three independant biological replicate were taken for the RNA extraction and hybridization on affymetrix array in the middle of the exponential growth phase.

2014-01-01 | E-GEOD-51076 | biostudies-arrayexpress

Deciphering the regulon of the alternative extracytoplasmic function (ECF) sigma factor DvdS and its dependence on the regulatory proteins CarD and CarG

Project description:This study addresses the key role of the extracytoplasmic function (ECF) sigma factor DdvS in the Gram-negative bacterium Myxococcus xanthus. It allows us to determine its regulon and it shows that the expression of ddvS and its regulón depends on the global regulatory complex CarD-CarG.

2018-05-15 | GSE112385 | GEO

Expression profiling analyses of ECF sigma factor PG1660 mutant of Porphyromonas gingivalis W83

Project description:To study the expression profile of ECF sigma factor PG1660 mutant under anaerobic conditions and hydrogen peroxide stress conditions compared to the wild-type W83 by using DNA-microarray. The role of ECF sigma factor PG1660 involved in oxidative stress was published Yuetan Dou, Devon Osbourne, Rachelle McKenzie, Hansel M Fletcher. (2010) Involvement of extracytoplasmic function sigma factors in virulence regulation in Porphyromonas gingivalis W83. FEMS Microbiology Letter, 312(1):24-32.

2017-09-14 | GSE103838 | GEO

The temperature-regulation of Pseudomonas aeruginosa cmaX-cfrX-cmpX operon reveals an intriguing molecular network involving the sigma factors AlgU and SigX

Project description:Pseudomonas aeruginosa is a highly adaptable Gram-negative opportunistic pathogen, notablydue to its large number of transcription regulators. The extracytoplasmic sigma factor (ECF sigma AlgU, responsible for alginate biosynthesis, is also involved in responses to cell wall stress and heat shock via the RpoH alternative sigma factor. The SigX ECF sigma emerged as a major regulator involved in the envelope stress response via membrane remodelling, virulence and biofilm formation. However, their functional interactions to coordinate the envelope homeostasis in response to environmental variations remain to be determined. The regulation of the putative cmaX-cfrX-cmpX operon located directly upstream sigX was investigated by applying sudden temperature shifts from 37°C. We identified a SigX- and an AlgU- dependent promoter region upstream of cfrX and cmaX, respectively. We show that cmaX expression is increased upon heat shock through an AlgU-dependent but RpoH independent mechanism. In addition, the ECF sigma SigX is activated in response to valinomycin, an agent altering the membrane structure, and up-regulates cfrX-cmpX transcription in response to cold shock. Altogether, these data provide new insights into the regulation exerted by SigX and networks that are involved in maintaining envelope homeostasis.

2020-10-05 | PXD021299 | Pride

Role of an extracytoplasmic function sigma factor, PGN_0319, in hemin utilization by Porphyromonas gingivalis

Project description:Extracytoplasmic function (ECF) sigma factors are known to play an important role in the bacterial response to various environmental stresses. Porphyromonas gingivalis, a prominent etiological agent in human periodontitis, possesses six putative ECF sigma factors. So far, information is limited on an ECF sigma factor, PGN_0319. It has been recently reported that the expression of genes encoding some of the ECF sigma factors including PGN_0319 was affected by hemin availability. The aim of this study was to evaluate the role of PGN_0319 in hemin utilization by P. gingivalis. We evaluated the gene expression profile of the PGN_0319 mutant by DNA microarray, and then real-time reverse transcription PCR analysis was performed to assess genes with altered expression levels. The expressions level of hmuY and hmuR, which encode an outer-membrane protein involved in hemin utilization, and cdhR, a transcriptional regulator of hmuYR, were significantly decreased in the PGN_0319 mutant. The transcription of these genes was restored in the PGN_0319 complemented strain. We observed that the PGN_0319 mutant showed reduced growth in log phase compared with wild type under hemin-limiting condition. By electrophoretic mobility shift assay we demonstrated the recombinant PGN_0319 protein bound to the promoter region of hmuY and cdhR. In addition, we observed that PGN_0319 gene was upregulated in response to low cell density. These results demonstrate that PGN_0319 play an important role in the early growth of P. gingivalis, and directly regulates hmuYR and cdhR, thereby plays a role in the mechanisms involved in hemin utilization by P. gingivalis.

2017-01-01 | GSE78048 | GEO

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