Proteome remodelling by the stress sigma factor RpoS/σS in Salmonella: identification of small proteins and evidence for post-transcriptional regulation

Scientific Reports
Magali LagoFrançoise Norel

Abstract

The RpoS/σS sigma subunit of RNA polymerase is the master regulator of the general stress response in many Gram-negative bacteria. Extensive studies have been conducted on σS-regulated gene expression at the transcriptional level. In contrast, very limited information regarding the impact of σS on global protein production is available. In this study, we used a mass spectrometry-based proteomics approach to explore the wide σS-dependent proteome of the human pathogen Salmonella enterica serovar Typhimurium. Our present goals were twofold: (1) to survey the protein changes associated with the ΔrpoS mutation and (2) to assess the coding capacity of σS-dependent small RNAs. Our proteomics data, and complementary assays, unravelled the large impact of σS on the Salmonella proteome, and validated expression and σS regulation of twenty uncharacterized small proteins of 27 to 96 amino acids. Furthermore, a large number of genes regulated at the protein level only were identified, suggesting that post-transcriptional regulation is an important component of the σS response. Novel aspects of σS in the control of important catabolic pathways such as myo-inositol, L-fucose, propanediol, and ethanolamine were illuminated by this work, provi...Continue Reading

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Citations

Dec 13, 2017·The Biochemical Journal·Paola CavaliereFrançoise Norel
Dec 18, 2018·Environmental Microbiology·Carolina Alves FelicianoBruno Dupuy
Dec 20, 2018·Molecular Plant-microbe Interactions : MPMI·Seul I Kim, Hyunjin Yoon
May 16, 2019·Infection and Immunity·Elodie CuenotIsabelle Martin-Verstraete
Mar 17, 2020·Cellular Microbiology·Arturo Aguilar-RojasNancy Guillen
Oct 28, 2020·Journal of Bacteriology·Aryashree ArunimaMrutyunjay Suar
Dec 16, 2020·The Journal of Clinical Investigation·Inès AmbiteCatharina Svanborg
Jun 23, 2018·Microbiology Spectrum·Jordan K VillaMing C Hammond

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Datasets Mentioned

BETA
PXD005256

Methods Mentioned

BETA
electrophoresis
proteomic profiling
RNAseq
Protein Assay
acetylation

Software Mentioned

MaxQuant
Interpro IPR
Xcalibur
Perseus
Andromeda

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