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Transcriptional profiling of M. tuberculosis CDC1551 wild type vs aprABC null, aprBC null, aprC null and phoP transposon mutants.

ABSTRACT: Following phagocytosis by macrophages, Mycobacterium tuberculosis (Mtb) senses the intracellular environment and remodels its gene expression for growth in the phagosome. Abramovitch et.al. in this current study identified an Acid and Phagosome Regulated (aprABC) locus that is unique to the Mtb complex and whose gene expression is induced during growth in acidic environments in vitro and in macrophages. The authors propose a model where phoP senses the acidic pH of the phagosome and induces aprABC expression to fine-tune processes unique for intracellular adaptation of Mtb complex bacteria.

ORGANISM(S): Mycobacterium tuberculosis

PROVIDER: GSE22854 | GEO | 2011/07/09

SECONDARY ACCESSION(S): PRJNA128063

REPOSITORIES: GEO

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Transcriptional profiling of M. tuberculosis CDC1551 wild type vs aprABC null, aprBC null, aprC null and phoP transposon mutants.

Project description:Following phagocytosis by macrophages, Mycobacterium tuberculosis (Mtb) senses the intracellular environment and remodels its gene expression for growth in the phagosome. Abramovitch et.al. in this current study identified an Acid and Phagosome Regulated (aprABC) locus that is unique to the Mtb complex and whose gene expression is induced during growth in acidic environments in vitro and in macrophages. The authors propose a model where phoP senses the acidic pH of the phagosome and induces aprABC expression to fine-tune processes unique for intracellular adaptation of Mtb complex bacteria. This study uses microarray analyses to compare transcriptional responses of wild type Mycobacterium tuberculosis (CDC1551) to aprABC locus deletion mutants and the phoP transposon mutant. The bacteria were grown to early log phase in vented T-75 standing flasks containing 12 mL of pH 7.0 7H9 OADC medium. Transcript levels of the wild type bacteria were compared to the following mutants: aprABC null, aprBC null, aprC null, phoP::Tn mutant.

2011-07-09 | E-GEOD-22854 | biostudies-arrayexpress

PhoP regulon in pathogenic Escherichia coli

Project description:PhoP is considered a regulator of virulence despite being conserved in both pathogenic and non-pathogenic Enterobacteriaceae. While Escherichia coli strains represent both non-pathogenic commensal isolates and numerous virulent pathotypes, the PhoP virulence regulator has only been studied in commensal E. coli. To better understand how conserved transcription factors contribute to virulence, we characterized PhoP in pathogenic E. coli. Loss of phoP significantly attenuated E. coli during extraintestinal infection. This was not surprising since we demonstrated that PhoP differentially regulated the transcription of >600 genes. In addition to survival at acidic pH and resistance to polymyxin B, PhoP was required for repression of motility and oxygen-independent changes in the expression of primary dehydrogenase and terminal reductase respiratory chain components. All phenotypes have in common a reliance on an energized membrane. Thus, we hypothesized that PhoP mediated these effects by regulating genes that generate a proton motive force. Indeed, bacteria lacking PhoP exhibited a hyper-polarized membrane, and dissipation of the transmembrane electrochemical gradient increased the susceptibility of the phoP mutant to acidic pH, while inhibiting respiratory generation of the proton gradient restored resistance to antimicrobial peptides independent of lipopolysaccharide modification. These findings demonstrate a connection between PhoP, virulence, and the energized state of the membrane.

2011-07-29 | GSE31029 | GEO

PhoP regulon in pathogenic Escherichia coli

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Gene expression profile of WT and phoP mutant Mtb under heat-shock condition

Project description:Heat-shock of 1 hr 30 min was given to WT and phoP mutant Mtb and gene expression profile was studied

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Transcription profiling of PhoP-regulon members under low Mg2+ Ca2+ condition of Xanthomonas oryzae pv. oryzae PXO99A

Project description:In bacteria, two-component regulatory system (TCSs) is generally characterized by a simple phosphotransfer scheme, composed of a sensor domain (a histidine kinase) and a response domain (a response regulator), which is responsible for detection of external stimuli. PhoP-PhoQ TCS of Xanthomonas oryzae pv. oryzae (Xoo), a causal agent of bacterial leaf blight disease in rice, was previously shown to be negatively regulated by RaxR-RaxH, another TCS that senses population cell density as well as modulates the activity of AvrXA21, a bacterial effector, recognized by a bacterial blight resistance gene, Xa21. In this work, whole-genome microarray was performed to analyze transcription profiling and identify member of PhoP regulon under Mg2+ and Ca2+ limited condition. This analysis revealed that PhoP governs broad cellular pathways including stress defense response, cation transportation, general metabolism, broad regulatory system, bacterial motility, and bacterial virulence. Array results provide a set of candidate genes, further biochemical pathway analysis, and signaling pathway crosstalks that need to be characterized to understand PhoP-dependent mechanisms and also suggest a putative regulatory loop between two phoP-phoQ and raxR-raxH TCSs. Implication of this analysis suggested that Xoo adopt PhoP-PhoQ system to perceive extracellular signals from certain environment such as low concentration of metal ions, and to regulate intracellular signals of other regulatory systems. Keywords: Comparative transcription profiling under limited Mg2+ Ca2+ condition

2008-07-16 | GSE12099 | GEO

Transcription profiling of PhoP-regulon members under low Mg2+ Ca2+ condition of Xanthomonas oryzae pv. oryzae PXO99A

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M. tuberculosis phoP mutant lacking mcr7

Project description:The PhoPR two-component system is essential for virulence in Mycobacterium tuberculosis where it controls expression of approximately 2% of the genes, including those for the ESX-1 secretion apparatus, a major virulence determinant. Mutations in phoP lead to compromised production of pathogen-specific cell wall components and attenuation both ex vivo and in vivo. The PhoP regulon comprises several transcriptional regulators as well as genes for polyketide synthases and PE/PPE proteins. The most prominent site of PhoP regulation was located in the intergenic region between rv2395 and PE_PGRS41, where the mcr7 gene codes for a small non-coding RNA (ncRNA). Our prediction suggested that Mcr7 might regulate tatC at the post-transcriptional level by occlusion of the RBS and the consequent translational arrest. Consequently, we studied the secretome from exponentially grown cultures of strain H37Rv, its phoP mutant and a phoP complemented mutant by in-depth proteomics. The results are consistent with a regulatory model involving PhoP, Mcr7 and tatC mRNA since the absence of Mcr7 in the phoP mutant would result in more efficient TatC translation and therefore increased secretion.

2018-08-29 | PXD000698 | Pride

Transcription profiling of intracellular Salmonella enterica serovar Typhimurium phoP mutant inside fibroblast cells

Project description:Transcriptomic analysis of intracellular Salmonella enterica serovar Typhimurium phoP mutant inside fibroblast cells

2010-12-01 | E-MEXP-1774 | biostudies-arrayexpress

Chromatin immunoprecipitation of Streptomyces coelicolor wild type and phP-null mutants during phosphate starvation to determine binding locations of PhoP

Project description:S. coelicolor was grown in low-phosphate concentration R5 liquid medium which facilitated the transition to a phosphate starvation induced stationary phase and the subsequent induction of the PhoP regulon. The genome wide binding locations of PhoP during phosphate starvation were determined by chromatin-immunopreciptiation followed by hybridisation to high density S. coelicolor DNA microarrays. The use of both wild-type S. coelicolor and phoP-null mutant strains allowed the identification of specific PhoP binding locations.

2012-08-30 | E-MAXD-50 | biostudies-arrayexpress

Transcription profiling of Yersinia pestis overexpressing phoP

Project description:Microarrays were used to identify Y. pestis genes that are differentially regulated under conditions of phoP overexpression. RNA samples were isolated from cultures of two isogenic Y. pestis strains, one overexpressing phoP (KIM10+phoP(delta)/PhoP) and the other not (KIM10+phoP(delta)/MMB67EH), and their gene expression profiles were compared.

2006-07-01 | E-MEXP-712 | biostudies-arrayexpress

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