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Systems approach elucidates convoluted transcriptional regulation on carbon metabolism [RNA-seq]

ABSTRACT: The carbon metabolism in bacteria is regulated by two global TFs, CRP and Cra. While the regulon of CRP has been extensively studied, the complete definition of Cra has been missing. Thus, in vivo TF binding measurement with ChIP-exo and transcriptional expression measurement with RNA-seq for Cra was performed to define the Cra regulon.

ORGANISM(S): Escherichia coli

PROVIDER: GSE65642 | GEO | 2018/04/18

REPOSITORIES: GEO

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Systems approach elucidates convoluted transcriptional regulation on carbon metabolism [ChIP-seq]

Project description:The carbon metabolism in bacteria is regulated by two global TFs, CRP and Cra. While the regulon of CRP has been extensively studied, the complete definition of Cra has been missing. Thus, in vivo TF binding measurement with ChIP-exo and transcriptional expression measurement with RNA-seq for Cra was performed to define the Cra regulon.

2018-04-18 | GSE65641 | GEO

Escherichia coli segments its controls on carbon-dependent gene expression into global and specific regulations

Project description:We investigated the way global gene expression changed in E. coli correlated with the metabolism of seven carbon substrates chosen to trigger a large panel of metabolic pathways with features varying in: carbon influx flow rate; entry points in the metabolic network; modes of transport. Quantitative coarse-grained expression-pattern analysis demonstrated that the gene expression trend following immediately the reduction of carbon influx flow rate was determined by its initial expression level. Subsequent fine-grained expression-pattern analysis demonstrated that the Crp regulator, associated to a change in growth rate, governed the response of most carbon influx-dependent genes. By contrast, the Cra, Mlc and Fur regulators governed the expression of genes responding to non-glycolytic substrates, glycolytic substrates or PTS (phosphotransferase system) transported sugars following an idiosyncratic way, with the function of each of these regulators being titrated by the metabolism of the corresponding substrates. This work also allowed us to expand the extent of the gene complement regulated by each regulator with additional genes (27 genes in the Crp regulon, 49 genes in the Cra regulon, 1 gene in the Mlc regulon and 2 genes in Fur regulon) and to elucidate the regulatory functions of each regulator comprehensively. Strikingly, Crp and Cra worked in concert to coordinate central carbon metabolism with amino acids biosynthesis. Together, these results demonstrated the power of physiology-based interperation of global data in revealing regulatory networks of bacteria.

2021-03-02 | GSE156143 | GEO

Systems approach elucidates convoluted transcriptional regulation on carbon metabolism

Project description:This SuperSeries is composed of the SubSeries listed below.

2018-04-18 | GSE65643 | GEO

Integrated analysis of molecular and systems level function of the Crp regulon [ChIP-exo]

Project description:A fundamental goal of biological research is to connect molecular events with macroscopic physiological phenomena. By incorporating a multi-scale approach that accounts for mechanistic properties of promoters and maps those findings to a genome-scale metabolic-regulatory network, the Escherichia coli Crp regulon is revealed, enabling systems analytics to be applied to delineate its governing role in regulating cellular carbon flow. Genome-wide promoter functions were characterized using ChIP-exo elucidating stable intermediates formed during transcription initiation and distinctions between transcriptional activators and repressors. Genome-wide analysis of Crp regulated genes showed a coordinate regulation of catabolism, anabolism, and energy-generating chemiosmotic processes. Examination of the functional state of the reconstructed regulon during growth on multiple substrates revealed a coherent quantitative adjustment of these overall metabolic processes based on substrate quality, revealing the detailed mechanistic basis for the phenomenologically observed homoeostatic response. Thus, a multi-scale relationship from individual molecular mechanisms to physiological properties is established.

2017-01-09 | GSE64847 | GEO

Integrated analysis of molecular and systems level function of the Crp regulon [RNA-Seq]

2017-01-09 | GSE64848 | GEO

The pyruvate-tricarboxylic acid cycle node: a focal point of virulence control in the enteric pathogen Yersinia pseudotuberculosis [crp mutant]

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Salmonella enterica subsp. enterica serovar Typhimurium

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Expression analysis, A. actinomycetemcomitans wild type (JP2) vs CRP deletion mutant both grown anaerobically.

Project description:The goal of this analysis is to define the anaerobic regulon for the global transcription factor CRP (catabolite repressor protein) in the periodontal pathogen Aggregatibacter actinomycetemcomitans. The objectives were met by comparing the mRNA profile of a wild type strain, JP2, to that of an isogenic mutant deleted of the CRP gene. Both strains were grown anaerobically.

2011-06-01 | GSE25459 | GEO

Effect of Cra and carbon sources on global transcription

Project description:The Gram-negative bacterium Vibrio cholerae adapts to changes in environment by selectively producing the necessary machinery to uptake and metabolize available carbohydrates. The import of the six-carbon sugar fructose by the fructose-specific phosphoenolpyruvate (PEP) phosphotransferase system (PTS) is of particular interest because of its putative connection to biofilms, which have been shown to promote host colonization and cholera pathogenesis. This study focused on the transcriptional response to glucose and fructose, and the role of the Cra protein in this regulatory process.

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