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The sigma factor E of Mycobacterium tuberculosis modulates the inflammatory response of macrophages

ABSTRACT: Mycobacterium tuberculosis (Mtb) is well adapted to survive in macrophages and usually subverts the bactericidal mechanisms of these professional phagocytes. The adaptation of Mtb to the intracellular life depends on its ability to regulate the expression of its genes. Among the most important bacterial transcription activators are the sigma factors that bind to the RNA polymerase and give it promotor specificity. Sigma factor E (SigE) controls the expression of genes that are essential for Mtb virulence. Analysis of the macrophage transcriptional response indicated that proteins encoded by the sigE regulon are involved in the modulation of the macrophage inflammatory response. Keywords: Comparison of responses to infections

ORGANISM(S): Mus musculus

PROVIDER: GSE7871 | GEO | 2008/03/27

SECONDARY ACCESSION(S): PRJNA100015

REPOSITORIES: GEO

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The sigma factor E of Mycobacterium tuberculosis modulates the inflammatory response of macrophages

Project description:Mycobacterium tuberculosis (Mtb) is well adapted to survive in macrophages and usually subverts the bactericidal mechanisms of these professional phagocytes. The adaptation of Mtb to the intracellular life depends on its ability to regulate the expression of its genes. Among the most important bacterial transcription activators are the sigma factors that bind to the RNA polymerase and give it promotor specificity. Sigma factor E (SigE) controls the expression of genes that are essential for Mtb virulence. Analysis of the macrophage transcriptional response indicated that proteins encoded by the sigE regulon are involved in the modulation of the macrophage inflammatory response. We compared the global gene expression of mouse bone marrow macrofages infected with H37Rv and SigE to the gene expression profile of the uninfected macrophages.

2010-05-25 | E-GEOD-7871 | biostudies-arrayexpress

The sigma factor E of Mycobacterium tuberculosis modulates the inflammatory response of human THP1 cells

Project description:Mycobacterium tuberculosis (Mtb) is well adapted to survive in macrophages and usually subverts the bactericidal mechanisms of these professional phagocytes. The adaptation of Mtb to the intracellular life depends on its ability to regulate the expression of its genes. Among the most important bacterial transcription activators are the sigma factors that bind to the RNA polymerase and give it promotor specificity. Sigma factor E (SigE) controls the expression of genes that are essential for Mtb virulence. Analysis of the macrophage transcriptional response indicated that proteins encoded by the sigE regulon are involved in the modulation of the macrophage inflammatory response. We compared the global gene expression of THP1 macrophages infected with H37Rv and SigE to the gene expression profile of uninfected macrophages.

2010-05-25 | E-GEOD-7870 | biostudies-arrayexpress

The sigma factor E of Mycobacterium tuberculosis modulates the inflammatory response of human THP1 cells

2008-03-27 | GSE7870 | GEO

The global transcriptional profile of Mycobacterium tuberculosis during human macrophages infection

Project description:During lung infection Mycobacterium tuberculosis (Mtb) resides in macrophages and subverts the bactericidal mechanisms of these professional phagocytes. In this work we have analyzed by DNA microarray technique the global transcription profile of Mtb infecting primary human macrophages in order to identify putative bacterial pathogenic factors that can be relevant for the intracellular survival of Mtb. Keywords: time course We compared the global gene expression of the H37Rv strain of Mtb after 4 hours and 24 hours of infection of human macrophage-like THP-1 cells with the gene expression profile of the strain growing exponentially in broth cultures.

2010-05-27 | E-GEOD-6209 | biostudies-arrayexpress

The global transcriptional profile of Mycobacterium tuberculosis during human macrophages infection

2007-12-18 | GSE6209 | GEO

Sigma factor E of Mycobacterium tuberculosis controls the expression of bacterial components that modulate macrophages

Project description:Sigma factor E (SigE) controls the expression of genes that are essential for Mtb virulence. In this work, we have identified the SigE regulon during infection of macrophages Our results indicate that SigE regulates the expression of genes involved in the maintenance of Mtb cell envelope integrity and function (i.e., detoxification and secretion). Keywords: strains comparison We compared the global gene expression of the H37Rv strain and the sigE mutant strain of Mtb in different conditions: growing exponentially in liquid media; after 2h of incubation in RPMI; or after 24 hours of infection of human macrophage-like THP-1 cells.

2010-05-25 | E-GEOD-7962 | biostudies-arrayexpress

Sigma factor E of Mycobacterium tuberculosis controls the expression of bacterial components that modulate macrophages

2008-03-27 | GSE7962 | GEO

In vivo recruitment analysis and a mutant strain without any group 2 σ factors reveal roles of different σ factors in cyanobacteria

Project description:In eubacteria, replacement of one σ factor in the RNA polymerase (RNAP) holoenzyme by another one changes the transcription pattern. Cyanobacteria are eubacteria characterized by oxygenic photosynthesis and they typically encode numerous group 2 σ factors that closely resemble the essential primary σ factor. A mutant strain of the model cyanobacterium Synechocystis sp. PCC 6803 without functional group 2 σ factors (named as ΔsigBCDE) could not acclimate to heat, high salt, or bright light stress but in standard conditions ΔsigBCDE grew only 9% slower than the control strain. One-fifth of the genes in ΔsigBCDE were differently expressed compared to the control strain in standard growth conditions and several physiological changes in photosynthesis, and pigment and lipid compositions were detected. To directly analyze the σ factor content of RNAP holoenzyme in vivo, a His-tag was added to the γ subunit of RNAP in Synechocystis and RNAPs were collected. The results revealed that all group 2 σ factors were recruited by RNAP in standard conditions, but recruitment of SigB and SigC increased in heat stress, SigD in bright light, SigE in darkness and SigB, SigC and SigE in high salt, explaining the poor acclimation of ΔsigBCDE to these stress conditions.

2015-09-15 | GSE69981 | GEO

Role of the extracytoplasmic function sigma factor SigE in the stringent response of Mycobacterium tuberculosis

Project description:Bacteria respond to nutrient starvation implementing the stringent response, a stress signalling system resulting in metabolic remodelling leading to decreased growth rate and energy requirements. A well-characterized model of stringent response in Mycobacterium tuberculosis is that one induced by growth in low phosphate. The extracytoplasmic function (ECF) sigma factor SigE was previously suggested having a key role in the activation of stringent response. In this study we challenge this hypothesis by analyzing the temporal dynamics of the transcriptional response of a sigE mutant and its wild-type parental strain to low phosphate using RNA sequencing. We found that both strains responded to low phosphate with a typical stringent response trait, including the downregulation of genes encoding ribosomal proteins and RNA polymerase. We also observed transcriptional changes that support the occurring of an energetics imbalance, compensated by a reduced activity of the electron transport chain, decreased export of protons and a remodelling of central metabolism. The most striking difference between the two strains was the induction in the sigE mutant of several stress-related genes. In particular, the genes encoding the ECF sigma factor SigH and the transcriptional regulator WhiB6. Since both proteins respond to redox unbalances, their induction suggests that the sigE mutant is not able to maintain redox homeostasis in response to the energetics imbalance induced by low phosphate. In conclusion, our data suggest that SigE is not directly involved in initiating stringent response, but in protecting the cell from stress consequent to the exposure to low phosphate and activation of stringent response.

2022-08-16 | GSE211141 | GEO

Identification by ChIP-Seq of the binding sites of the extracytoplasmic function (ECF) sigma factor SigE in the genome of Streptomyces coelicolor A3(2) M600.

Project description:SigE is a sigma factor found in Streptomyces species and is the key regulator of cell envelope stress response in Streptomyces coelicolor. This ChIP-Seq experiment was carried out to determine the binding sites of SigE under conditions of cell envelope stress induced by 10 ug / ml vancomycin for 30 minutes. A 3xFLAG tagged SigE was introduced in a SigE deletion strain and ChIP-Seq was carried out using M2 (Sigma Aldrich A2220) gel suspension. Non-immunoprecipitated (total) DNA preparations were used for background determination and the wild type M600 was used as the negative control.

2019-04-24 | E-MTAB-7827 | biostudies-arrayexpress

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