Metabolome and transcriptome-wide effects of the carbon storage regulator A in enteropathogenic Escherichia coli.
Cast your vote
You can rate an item by clicking the amount of stars they wish to award to this item.
When enough users have cast their vote on this item, the average rating will also be shown.
Your vote was cast
Thank you for your feedback
Thank you for your feedback
MetadataShow full item record
AbstractThe carbon storage regulator A (CsrA) is a conserved global regulatory system known to control central carbon pathways, biofilm formation, motility, and pathogenicity. The aim of this study was to characterize changes in major metabolic pathways induced by CsrA in human enteropathogenic Escherichia coli (EPEC) grown under virulence factor-inducing conditions. For this purpose, the metabolomes and transcriptomes of EPEC and an isogenic ∆csrA mutant derivative were analyzed by untargeted mass spectrometry and RNA sequencing, respectively. Of the 159 metabolites identified from untargeted GC/MS and LC/MS data, 97 were significantly (fold change ≥ 1.5; corrected p-value ≤ 0.05) regulated between the knockout and the wildtype strain. A lack of csrA led to an accumulation of fructose-6-phosphate (F6P) and glycogen synthesis pathway products, whereas metabolites in lower glycolysis and the citric acid cycle were downregulated. Associated pathways from the citric acid cycle like aromatic amino acid and siderophore biosynthesis were also negatively influenced. The nucleoside salvage pathways were featured by an accumulation of nucleosides and nucleobases, and a downregulation of nucleotides. In addition, a pronounced downregulation of lyso-lipid metabolites was observed. A drastic change in the morphology in the form of vesicle-like structures of the ∆csrA knockout strain was visible by electron microscopy. Colanic acid synthesis genes were strongly (up to 50 fold) upregulated, and the abundance of colanic acid was 3 fold increased according to a colorimetric assay. The findings expand the scope of pathways affected by the csrA regulon and emphasize its importance as a global regulator.
AffiliationHZI,Helmholtz-Zentrum für Infektionsforschung GmbH, Inhoffenstr. 7,38124 Braunschweig, Germany.
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 4.0 International
- Biofilm formation and dispersal under the influence of the global regulator CsrA of Escherichia coli.
- Authors: Jackson DW, Suzuki K, Oakford L, Simecka JW, Hart ME, Romeo T
- Issue date: 2002 Jan
- Global regulatory mutations in csrA and rpoS cause severe central carbon stress in Escherichia coli in the presence of acetate.
- Authors: Wei B, Shin S, LaPorte D, Wolfe AJ, Romeo T
- Issue date: 2000 Mar
- The RNA binding protein CsrA is a pleiotropic regulator of the locus of enterocyte effacement pathogenicity island of enteropathogenic Escherichia coli.
- Authors: Bhatt S, Edwards AN, Nguyen HT, Merlin D, Romeo T, Kalman D
- Issue date: 2009 Sep
- Global regulation by the small RNA-binding protein CsrA and the non-coding RNA molecule CsrB.
- Authors: Romeo T
- Issue date: 1998 Sep
- The Legionella pneumophila genome evolved to accommodate multiple regulatory mechanisms controlled by the CsrA-system.
- Authors: Sahr T, Rusniok C, Impens F, Oliva G, Sismeiro O, Coppée JY, Buchrieser C
- Issue date: 2017 Feb