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PA3027, a novel AraC-type transcriptional regulator activating genes of glycerolipid metabolism in Pseudomonas aeruginosa (PA3027 overexpression RNA-seq)

ABSTRACT: PA3027, a novel AraC-type transcriptional regulator activating genes of glycerolipid metabolism in Pseudomonas aeruginosa (PA3027 overexpression RNA-seq)

PROVIDER: PRJNA686675 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13276967.fastq.gz	Fastqsanger.gz
	SRR13276968.fastq.gz	Fastqsanger.gz
	SRR13276969.fastq.gz	Fastqsanger.gz
	SRR13276970.fastq.gz	Fastqsanger.gz
	SRR13276971.fastq.gz	Fastqsanger.gz

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PA3027, a novel AraC-type transcriptional regulator activating genes of glycerolipid metabolism in Pseudomonas aeruginosa (PA3027 overexpression RNA-seq)

Project description:Pseudomonas aeruginosa encodes a large set of transcriptional regulators which allow to modulate and manage cellular metabolism to survive in variable environmental conditions, including the human body. The AraC family regulators are an abundant group of transcriptional regulators in bacteria, mostly acting as gene expression activators controlling diverse cellular functions e.g. carbon metabolism, stress response and virulence. PA3027 protein from P. aeruginosa has been classified in silico as a putative AraC-type transcriptional regulator. Comparative transcriptome analysis of P. aeruginosa PAO1161 overexpressing PA3027 versus empty vector control revealed a spectacular over 15-fold up-regulation of expression of pa3026-pa3024, PA3464 and PA3342 genes potentially involved in glycerolipid metabolism. Concomitantly, the ChIP-seq analysis using FLAG-PA3027 under mild overproduction conditions revealed at least 22 PA3027 binding sites in the PAO1161 genome, including promoter regions of genes showing a major increase in expression in response to PA3027 excess. The presented data showed that PA3027 acts as the transcriptional regulator in P. aeruginosa activating genes engaged in glycerolipid metabolism.

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Project description:PA3027, a novel AraC-type transcriptional regulator activating genes of glycerolipid metabolism in Pseudomonas aeruginosa (F-PA3027 ChIP-seq)

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An AraC/XylS Family Transcriptional Regulator Modulates the Oxidative Stress Response of Francisella tularensis

Project description:Francisella tularensis is a Gram-negative bacterium that causes a fatal human disease known as tularemia. The Centers for Disease Control have classified F. tularensis as Category A Tier-1 Select Agent. The virulence mechanisms of Francisella are not entirely understood. Francisella possesses very few transcription regulators, and most of these regulate the expression of genes involved in intracellular survival and virulence. The F. tularensis genome sequence analysis reveals an AraC (FTL_0689) transcriptional regulator homologous to the AraC/XylS family of transcriptional regulators. In Gram-negative bacteria, AraC activates genes required for L-arabinose utilization and catabolism. The role of the FTL_0689 regulator in F. tularensis is not known. In this study, we characterized the role of FTL_0689 in gene regulation of F. tularensis and investigated its contribution to intracellular survival and virulence. The results demonstrate that FTL_0689 in Francisella is not required for L-arabinose utilization. Instead, FTL_0689 specifically regulates the expression of the oxidative and global stress response, virulence, metabolism, and other key pathways genes required by Francisella when exposed to oxidative stress. The FTL_0689 mutant is attenuated for intramacrophage growth, and mice infected with the FTL_0689 mutant survive better than wild-type F. tularensis LVS infected mice. Based on the deletion mutant phenotype, FTL_0689 was termed osrR (oxidative stress response regulator). Altogether, this study elucidates the role of the osrR transcriptional regulator in tularemia pathogenesis.

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