The LysR-type transcriptional regulator BsrA (PA2121) is engaged in the control of vital metabolic pathways in Pseudomonas aeruginosa (RNA-seq)
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ABSTRACT:
PROVIDER: PRJNA685596 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR13255550.fastq.gz | Fastqsanger.gz | |||
| SRR13255551.fastq.gz | Fastqsanger.gz | |||
| SRR13255552.fastq.gz | Fastqsanger.gz | |||
| SRR13255553.fastq.gz | Fastqsanger.gz | |||
| SRR13255554.fastq.gz | Fastqsanger.gz |
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Project description:Pseudomonas aeruginosa, a facultative human pathogen causing nosocomial infections, has complex regulatory systems involving many transcriptional regulators. The LTTR family (LysR-Type Transcriptional Regulators) consists of proteins involved in regulation of various processes including stress response, motility, virulence or amino acid metabolism. The aim of this study was characterization of the LysR-type regulator BsrA (PA2121), identified previously as a negative regulator of biofilm formation in P. aeruginosa. To identify the BsrA binding sites in P. aeruginosa the ChIP-seq analysis was performed. It revealed 765 BsrA binding sites in P. aeruginosa PAO1161 genome, among them 367 was localized in the intergenic regions. Parallel transcriptomic analysis identified altered expression of 157 genes in response to BsrA excess, among them 35 had a BsrA binding site in the corresponding promoter regions, indicating direct influence of BsrA on expression of these genes. BsrA-repressed loci encompass genes encoding proteins engaged in key metabolic pathways including the tricarboxylic acid cycle. A group of directly activated genes by BsrA, consists of several loci encoding proteins involved in pili/fimbriae assembly as well as secretion and transport systems. Results also confirmed that BsrA acts as an autorepressor. Presented data uncover the regulon of BsrA protein with its role as transcriptional regulator of genes engaged in vital cellular processes in P. aeruginosa.
2021-06-17 | GSE163233 | GEO
Project description:Pseudomonas aeruginosa, a facultative human pathogen causing nosocomial infections, has complex regulatory systems involving many transcriptional regulators. The LTTR family (LysR-Type Transcriptional Regulators) consists of proteins involved in regulation of various processes including stress response, motility, virulence or amino acid metabolism. The aim of this study was characterization of the LysR-type regulator BsrA (PA2121), identified previously as a negative regulator of biofilm formation in P. aeruginosa. To identify the BsrA binding sites in P. aeruginosa the ChIP-seq analysis was performed. It revealed 765 BsrA binding sites in P. aeruginosa PAO1161 genome, among them 367 was localized in the intergenic regions. Parallel transcriptomic analysis identified altered expression of 157 genes in response to BsrA excess, among them 35 had a BsrA binding site in the corresponding promoter regions, indicating direct influence of BsrA on expression of these genes. BsrA-repressed loci encompass genes encoding proteins engaged in key metabolic pathways including the tricarboxylic acid cycle. A group of directly activated genes by BsrA, consists of several loci encoding proteins involved in pili/fimbriae assembly as well as secretion and transport systems. Results also confirmed that BsrA acts as an autorepressor. Presented data uncover the regulon of BsrA protein with its role as transcriptional regulator of genes engaged in vital cellular processes in P. aeruginosa.
2021-06-17 | GSE163234 | GEO
Project description:The LysR-type transcriptional regulator BsrA (PA2121) is engaged in the control of vital metabolic pathways in Pseudomonas aeruginosa (ChIP-seq)
| PRJNA685595 | ENA
Project description:Pseudomonas aeruginosa, a facultative human pathogen causing nosocomial infections, has complex regulatory systems involving many transcriptional regulators. LTTR (LysR-Type Transcriptional Regulator) family proteins are involved in the regulation of various processes, including stress responses, motility, virulence, and amino acid metabolism. The aim of this study was to characterize the LysR-type protein BsrA (PA2121), previously described as a negative regulator of biofilm formation in P. aeruginosa. Genome wide identification of BsrA binding sites using chromatin immunoprecipitation and sequencing analysis revealed 765 BsrA-bound regions in the P. aeruginosa PAO1161 genome, including 367 sites in intergenic regions. The motif T-N11-A was identified within sequences bound by BsrA. Transcriptomic analysis showed altered expression of 157 genes in response to BsrA excess; of these, 35 had a BsrA binding site within their promoter regions, suggesting a direct influence of BsrA on the transcription of these genes. BsrA-repressed loci included genes encoding proteins engaged in key metabolic pathways such as the tricarboxylic acid cycle. The panel of loci possibly directly activated by BsrA included genes involved in pilus/fimbria assembly, as well as secretion and transport systems. In addition, DNA pull-down and regulatory analyses showed the involvement of PA2551, PA3398, and PA5189 in regulation of bsrA expression, indicating that this gene is part of an intricate regulatory network. Taken together, these findings reveal the existence of a BsrA regulon, which performs important functions in P. aeruginosa. IMPORTANCE This study shows that BsrA, a LysR-type transcriptional regulator from Pseudomonas aeruginosa, previously identified as a repressor of biofilm synthesis, is part of an intricate global regulatory network. BsrA acts directly and/or indirectly as the repressor and/or activator of genes from vital metabolic pathways (e.g., pyruvate, acetate, and tricarboxylic acid cycle) and is involved in control of transport functions and the formation of surface appendages. Expression of the bsrA gene is increased in the presence of antibiotics, which suggests its induction in response to stress, possibly reflecting the need to redirect metabolism under stressful conditions. This is particularly relevant for the treatment of infections caused by P. aeruginosa. In summary, the findings of this study demonstrate that the BsrA regulator performs important roles in carbon metabolism, biofilm formation, and antibiotic resistance in P. aeruginosa.
| S-EPMC8407307 | biostudies-literature
Project description:A LysR-Type Transcriptional Regulator Controls Multiple Phenotypes in Acinetobacter baumannii
| PRJNA770634 | ENA
Project description:LysR-type transcriptional regulators (LTTRs) are emerging as key circuit components in regulating microbial stress responses and are implicated in modulating oxidative stress in the human opportunistic pathogen Pseudomonas aeruginosa. The oxidative stress response encapsulates several strategies to overcome the deleterious effects of reactive oxygen species. However, many of the regulatory components and associated molecular mechanisms underpinning this key adaptive response remain to be characterised. Comparative analysis of publically available transcriptomic datasets led to the identification of a novel LTTR, PA2206, whose expression was altered in response to a range of host signals in addition to oxidative stress. PA2206 was found to be required for tolerance to H2O2 in vitro and lethality in vivo in the Zebrafish embryo model of infection. Transcriptomic analysis in the presence of H2O2 showed that PA2206 altered the expression of 58 genes, including a large repertoire of oxidative stress and iron responsive genes, independent of the master regulator of oxidative stress, OxyR. Contrary to the classic mechanism of LysR regulation, PA2206 did not autoregulate its own expression and did not influence expression of adjacent or divergently transcribed genes. The PA2214-15 operon was identified as a direct target of PA2206 with truncated promoter fragments revealing binding to the 5M-bM-^@M-^Y-ATTGCCTGGGGTTAT-3M-bM-^@M-^Y LysR box adjacent to the predicted -35 region. PA2206 also interacted with the pvdS promoter suggesting a global dimension to the PA2206 regulon, and suggests PA2206 is an important regulatory component of P. aeruginosa adaptation during oxidative stress. Six samples were analysed in total, three biological replicates of the PA2206 mutant and PA2206 complemented strains. Each biological replicate included three technical replicates.
2013-01-01 | E-GEOD-23367 | biostudies-arrayexpress
Project description:CRISPR-Cas immunity is repressed by the LysR-type transcriptional regulator PigU
| PRJNA1020058 | ENA
Project description:Purpose: The goal of this study was to identify Staphylococcus aureus genes which are important during establishment of metastatic infections in bloodstream infections. Methods: Pooled mariner transposon mutant libraries were generated as previously described (PMID: 27185949). The libraries were sequenced on the Illumina HiSeq 2500 platform with the transposon-specific oligonucleotide primer Himar1-Seq. Illumina adapter sequences were removed via cutadapt version 1.2.1. The reads were filtered for size (>16 bp) and to contain the signature transposon inverted repeat. Reads were mapped to the Staphylococcus aureus 6850 genome (RefSeq accession NC_022222.1) by Bowtie2 v2.1.0. Identification of depleted and enriched mutants was performed via DESeq2 version 1.6.2. Results: S. aureus genes were identified which were upregulated or downregulated upon iduced expression of the LysR-type transcriptional regulator RSAU_000852 in Staphylococcus aureus 6850. Conclusions: Our study identifies a gene for a LysR-type transcription regulator, which is involved in metabolic adaptation of the pathogen during colonization of secondary infection sites in a bloodstream infection model.
2020-09-08 | GSE139513 | GEO
Project description:Acinetobacter baumannii is a multidrug-resistant, Gram-negative nosocomial pathogen that exhibits phenotypic heterogeneity resulting in virulent opaque (VIR-O) and avirulent translucent (AV-T) colony variants. Each variant has a distinct gene expression profile resulting in multiple phenotypic differences. Cells interconvert between the VIR-O and AV-T variants at high frequency under laboratory conditions, suggesting that the genetic mechanism underlying the phenotypic switch could be manipulated to attenuate virulence. Therefore, our group has focused on identifying and characterizing genes that regulate this switch, which led to the investigation of ABUW_1132 (1132), a highly conserved gene predicted to encode a LysR-type transcriptional regulator. ABUW_1132 was shown to be a global regulator as the expression of 74 genes was altered > 2-fold in an 1132 deletion mutant. The 1132 deletion also resulted in a 16-fold decrease in VIR-O to AV-T switching, loss of 3-OH-C12-HSL secretion, and reduced surface-associated motility. Further, the deletion of 1132 in the AV-T background caused elevated capsule production, which increased colony opacity and altered the typical avirulent phenotype of translucent cells. These findings distinguish 1132 as a global regulatory gene and advance our understanding of A. baumannii’s opacity-virulence switch.
2021-10-19 | GSE185730 | GEO
Project description:LysR-type transcriptional regulators (LTTRs) are emerging as key circuit components in regulating microbial stress responses and are implicated in modulating oxidative stress in the human opportunistic pathogen Pseudomonas aeruginosa. The oxidative stress response encapsulates several strategies to overcome the deleterious effects of reactive oxygen species. However, many of the regulatory components and associated molecular mechanisms underpinning this key adaptive response remain to be characterised. Comparative analysis of publically available transcriptomic datasets led to the identification of a novel LTTR, PA2206, whose expression was altered in response to a range of host signals in addition to oxidative stress. PA2206 was found to be required for tolerance to H2O2 in vitro and lethality in vivo in the Zebrafish embryo model of infection. Transcriptomic analysis in the presence of H2O2 showed that PA2206 altered the expression of 58 genes, including a large repertoire of oxidative stress and iron responsive genes, independent of the master regulator of oxidative stress, OxyR. Contrary to the classic mechanism of LysR regulation, PA2206 did not autoregulate its own expression and did not influence expression of adjacent or divergently transcribed genes. The PA2214-15 operon was identified as a direct target of PA2206 with truncated promoter fragments revealing binding to the 5’-ATTGCCTGGGGTTAT-3’ LysR box adjacent to the predicted -35 region. PA2206 also interacted with the pvdS promoter suggesting a global dimension to the PA2206 regulon, and suggests PA2206 is an important regulatory component of P. aeruginosa adaptation during oxidative stress.
2013-01-01 | GSE23367 | GEO