Decoding genome-wide GadEWX-transcriptional regulatory networks reveals multifaceted cellular responses to acid stress in Escherichia coli
Citations Over TimeTop 10% of 2015 papers
Abstract
The regulators GadE, GadW and GadX (which we refer to as GadEWX) play a critical role in the transcriptional regulation of the glutamate-dependent acid resistance (GDAR) system in Escherichia coli K-12 MG1655. However, the genome-wide regulatory role of GadEWX is still unknown. Here we comprehensively reconstruct the genome-wide GadEWX transcriptional regulatory network and RpoS involvement in E. coli K-12 MG1655 under acidic stress. Integrative data analysis reveals that GadEWX regulons consist of 45 genes in 31 transcription units and 28 of these genes were associated with RpoS-binding sites. We demonstrate that GadEWX directly and coherently regulate several proton-generating/consuming enzymes with pairs of negative-feedback loops for pH homeostasis. In addition, GadEWX regulate genes with assorted functions, including molecular chaperones, acid resistance, stress response and other regulatory activities. These results show how GadEWX simultaneously coordinate many cellular processes to produce the overall response of E. coli to acid stress.
Related Papers
- → Function, Evolution, and Composition of the RpoS Regulon in Escherichia coli(2020)120 cited
- → The alternative sigma factor σE controls antioxidant defences required for Salmonella virulence and stationary‐phase survival(2002)184 cited
- → Identification of RpoS (ς S )-Regulated Genes in Salmonella enterica Serovar Typhimurium(2000)150 cited
- → The H‐NS‐like protein StpA represses the RpoS (σ 38 ) regulon during exponential growth of Salmonella Typhimurium(2009)54 cited
- → The Role of RpoS in Bacterial Adaptation(2007)20 cited