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Title: Global Analysis of Salmonella Alternative Sigma Factor E on Protein Translation

Journal Article · · Journal of Proteome Research
DOI:https://doi.org/10.1021/pr5010423· OSTI ID:1182899
 [1];  [2];  [2];  [1];  [1];  [2];  [2];  [1];  [1];  [2]
  1. Oregon Health & Science Univ., Portland, OR (United States). Dept. of Molecular Microbiology and Immunology
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Biological Sciences Division

The alternative sigma factor E (σE) is critical for response to extracytoplasmic stress in Salmonella. Extensive studies have been conducted on σE-regulated gene expression, particularly at the transcriptional level. Increasing evidence suggests however that σE may indirectly participate in post-transcriptional regulation. Here in this study, we conducted sample-matched global proteomic and transcriptomic analyses to determine the level of regulation mediated by σE in Salmonella. We analysed samples from wild type and isogenic rpoE mutant Salmonella cultivated in three different conditions; nutrient-rich and conditions that mimic early and late intracellular infection. We found that 30% of the observed proteome was regulated by σE combining all three conditions. In different growth conditions, σE affected the expression of a broad spectrum of Salmonella proteins required for miscellaneous functions. Those involved in transport and binding, protein synthesis, and stress response were particularly highlighted. By comparing transcriptomic and proteomic data, we identified genes post-transcriptionally regulated by σE and found that post-transcriptional regulation was responsible for a majority of changes observed in the σE-regulated proteome. Further, comparison of transcriptomic and proteomic data from hfq mutant of Salmonella demonstrated that σE–mediated post-transcriptional regulation was partially dependent on the RNA-binding protein Hfq.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH)
Grant/Contract Number:
AC05-76RLO01830; GM094623; GM103493
OSTI ID:
1182899
Report Number(s):
PNNL-SA-105707; 42294; 47623; 48135; 47418; 400412000
Journal Information:
Journal of Proteome Research, Vol. 14, Issue 4; ISSN 1535-3893
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (6)

ChIP-Seq Analysis of the σE Regulon of Salmonella enterica Serovar Typhimurium Reveals New Genes Implicated in Heat Shock and Oxidative Stress Response journal September 2015
Caco-2 Invasion by Cronobacter sakazakii and Salmonella enterica Exposed to Drying and Heat Treatments in Dried State in Milk Powder journal September 2017
A σE-Mediated Temperature Gauge Controls a Switch from LuxR-Mediated Virulence Gene Expression to Thermal Stress Adaptation in Vibrio alginolyticus journal June 2016
Identification of Novel Host Interactors of Effectors Secreted by Salmonella and Citrobacter journal July 2016
Bioprobes Based on Aptamer and Silica Fluorescent Nanoparticles for Bacteria Salmonella typhimurium Detection journal March 2016
Alternative Sigma Factor RpoX Is a Part of the RpoE Regulon and Plays Distinct Roles in Stress Responses, Motility, Biofilm Formation, and Hemolytic Activities in the Marine Pathogen Vibrio alginolyticus journal May 2019