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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Dual regulation of nitrogen metabolism by CodY and GlnR in Streptococcus mutans

ABSTRACT: CodY and GlnR are two major transcriptional regulators in nitrogen metabolism in Gram-positive bacteria. CodY regulates genes involved in the adaptive response to poor growth conditions, especially to nutrient limitation. GlnR controls nitrogen utilization according to the availability of nitrogen source. In this study we used microarray to investigate the regulatory roles that CodY and GlnR play in nitrogen metabolism in Streptococcus mutans. Streptococcus mutans UA159 wild-type cells, ΔcodY, ΔglnR, and ΔcodYglnR strains were grown in a chemically-defined medium until the mid-log phase. The nitrogen source was 1% tryptone. Twenty millimolar sodium thiosulfate was added to the medium to support cysteine biosynthesis. The transcriptional profile of the whole genome was examined with microarray.

ORGANISM(S): Streptococcus mutans UA159

SUBMITTER: Dragana Ajdic

PROVIDER: E-GEOD-13540 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Dual regulation of nitrogen metabolism by CodY and GlnR in Streptococcus mutans

Project description:CodY and GlnR are two major transcriptional regulators in nitrogen metabolism in Gram-positive bacteria. CodY regulates genes involved in the adaptive response to poor growth conditions, especially to nutrient limitation. GlnR controls nitrogen utilization according to the availability of nitrogen source. In this study we used microarray to investigate the regulatory roles that CodY and GlnR play in nitrogen metabolism in Streptococcus mutans.

2010-07-01 | GSE13540 | GEO

Regulation of glutamine and glutamate metabolism by GlnR and GlnA in Streptococcus pneumoniae

Project description:Several genes involved in nitrogen metabolism are known to contribute to the virulence of pathogenic bacteria. Here, we studied the function of the nitrogen regulatory protein GlnR in the Gram-positive human pathogen Streptococcus pneumoniae. We demonstrate that GlnR mediates transcriptional repression of genes involved in glutamine synthesis and uptake (glnA, glnPQ), glutamate synthesis (gdhA), and the gene encoding the pentose phosphate pathway enzyme Zwf, which forms an operon with glnPQ. Moreover, the expression of gdhA is also repressed by the pleiotropic regulator CodY. The GlnR-dependent regulation occurs through a conserved operator sequence and is responsive to the concentration of glutamate, glutamine and ammonium in the growth medium. By means of in vitro binding studies and transcriptional analyses we show that the regulatory function of GlnR is dependent on GlnA. Mutants of glnA and glnP displayed significantly reduced adhesion to Detroit 562 human pharyngeal epithelial cells, suggesting a role for these genes in the colonization of the host by S. pneumoniae. Thus, our results provide a thorough insight into the regulation of glutamine and glutamate metabolism of S. pneumoniae as mediated by both GlnR and GlnA. Keywords: genetic modification

2006-06-23 | GSE5088 | GEO

The CodY Regulon in Streptoccus mutans

Project description:In this report, codY mutant strains were constructed and used to demonstrate the relationship of (p)ppGpp synthesized by RelP and RelQ with the activation of CodY. In addition, because CodY has not been studied in S. mutans, we used microarrays to demonstrate that this protein function as a global regulator of gene expression in S. mutans. Keywords: stress response, gene knockout analysis

2008-10-31 | GSE9641 | GEO

Regulation of glutamine and glutamate metabolism by GlnR and GlnA in Streptococcus pneumoniae

2010-07-01 | E-GEOD-5088 | biostudies-arrayexpress

Streptococcus mutans UA159

Project description:Dual regulation of nitrogen metabolism by CodY and GlnR in Streptococcus mutans

| PRJNA110719 | ENA

Mycobacterium smegmatis - Comparison of glnR deletion strain MH1 under nitrogen surplus and starvation

Project description:In this approach, changes in total transcript of a glnR deletion strain of Mycobacterium smegmatis due to nitrogen starvation were monitored. This is a control experiment for the comparison of wild type and glnR deletion strain resulting in putative nitrogen-related genes which are not controlled by GlnR.

2011-07-01 | GSE30033 | GEO

Counteractive balancing of transcriptome expression involving CodY and CovRS in Streptococcus pyogenes

Project description:Streptococcus pyogenes (group A Streptococcus, GAS) responds to environmental changes in a manner that results in an adaptive regulation of the transcriptome. Global transcriptional regulators are able to integrate important extracellular and intracellular information and are responsible for modulation of the transcriptional network. The roles of several global transcriptional regulators in adaptation and virulence gene expression have been described. In this study we used microarray to investigate the regulatory roles of CodY and CovRS played in Streptococcus pyogenes. keywords: genetic modification Streptococcus pyogenes NZ131 wild-type cells, ΔcodY, ΔcovRS and ΔcodYcovRS strains were grown in C-medium until mid-exponential phase or early-stationary phase. The transcriptional profile of the whole genome was examined with microarray.

2011-03-01 | E-GEOD-26590 | biostudies-arrayexpress

Analyses of the GlnR- and AmtR- dependent nitrogen regulatory network of Mycobacterium smegmatis.

Project description:Total transcriptome analyses were carried out to investigate changes in transcript patterns in the Mycobacterium smegmatis wild type strain SMR5 due to nitrogen starvation and to expand the knowledge about the role of the two transcriptional regulators of nitrogen metabolism, namely GlnR and AmtR, in these processes. A first experiment revealed enhanced transcript levels of 284 genes and reduced transcripts of 231 genes in the wild type under nitrogen starvation compared to nitrogen surplus. When glnR deletion strain MH1 was compared to the wild type under nitrogen starvation, decreased transcript levels of 125 genes were detected, indicating that these are activated by GlnR due to nitrogen limitation. Comparing amtR deletion strain YL1 to the wild type under nitrogen starvation, enhanced transcript levels of 2 genes were found, indicating that they are repressed by AmtR under nitrogen surplus. A comparison of YL1 and wild type under surplus, as well as a comparison of YL1 under nitrogen surplus and starvation and of MH1 under nitrogen surplus and starvation were carried out as additional control experiments. It can be concluded that GlnR is the master regulator of nitrogen control in M. smegmatis and that AmtR fulfills only a small, subordinate role in the regulation of an operon. This SuperSeries is composed of the SubSeries listed below.

2011-07-01 | GSE30236 | GEO

Mycobacterium smegmatis - Comparison of wild type SMR5 and glnR deletion strain MH1 under nitrogen starvation

Project description:In this approach, total transcript of the Mycobacterium smegmatis wild type SMR5 and a glnR deletion strain was compared under nitrogen starvation. Transcript levels of 6 genes were enhanced, 125 genes reduced in the mutant strain. This experiment confirmed GlnR as the global regulator of nitrogen metabolism in M. smegmatis. Two biological replicates were analyzed.

2011-07-01 | GSE30234 | GEO

Transcription profiling by array of the complete GlnR nitrogen-response regulon in Mycobacterium smegmatis

Project description:BACKGROUND: Nitrogen is an essential element for bacterial growth and an important component of biological macromolecules. Consequently, responding to nitrogen limitation is critical for bacterial survival and involves the interplay of signalling pathways and transcriptional regulation of nitrogen assimilation and scavenging genes. In the soil dwelling saprophyte Mycobacterium smegmatis the OmpR-type response regulator GlnR is thought to mediate the transcriptomic response to nitrogen limitation. However, to date only ten genes have been shown to be in the GlnR regulon, a vastly reduced number compared to other organisms. RESULTS: We investigated the role of GlnR in the nitrogen limitation response and determined the entire GlnR regulon, by combining expression profiling of M. smegmatis wild type and glnR deletion mutant, with GlnR-specific chromatin immunoprecipitation and high throughput sequencing. We identify 53 GlnR binding sites during nitrogen limitation that control the expression of over 100 genes, demonstrating that GlnR is the regulator controlling the assimilation and utilisation of nitrogen. We also determine a consensus GlnR binding motif and identify key residues within the motif that are required for specific GlnR binding. CONCLUSIONS: We have demonstrated that GlnR is the global nitrogen response regulator in M. smegmatis, directly regulating the expression of more than 100 genes. GlnR controls key nitrogen stress survival processes including primary nitrogen metabolism pathways, the ability to utilise nitrate and urea as alternative nitrogen sources, and the potential to use cellular components to provide a source of ammonium. These studies further our understanding of how mycobacteria survive nutrient limiting conditions. [Data is also available from http://bugs.sgul.ac.uk/E-BUGS-143]

2013-04-24 | E-BUGS-143 | biostudies-arrayexpress

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