Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Analysis of the group A Streptococcus CcpA Transcriptome

ABSTRACT: This study evaluate how catabolite control protein A (CcpA) inactivation affected gene transcript levels in the group A Streptococcus serotype M1 strain MGAS5005 during growth in standard laboratory medium. Keywords: transcriptome analysis 4 replicates of strain MGAS5005 and delta_cppA were grown in THY to early and late logarithmic growth phases. The transcriptomes of each samples were then analyzed.

ORGANISM(S): Streptococcus sp. 'group A'

SUBMITTER: Samuel Shelburne

PROVIDER: E-GEOD-10156 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

A direct link between carbohydrate utilization and virulence in the major human pathogen group A Streptococcus.

Shelburne Samuel A SA Keith David D Horstmann Nicola N Sumby Paul P Davenport Michael T MT Graviss Edward A EA Brennan Richard G RG Musser James M JM

Proceedings of the National Academy of Sciences of the United States of America 20080129 5

Although central to pathogenesis, the molecular mechanisms used by microbes to regulate virulence factor production in specific environments during host-pathogen interaction are poorly defined. Several recent ex vivo and in vivo studies have found that the level of group A Streptococcus (GAS) virulence factor gene transcripts is temporally related to altered expression of genes encoding carbohydrate utilization proteins. These findings stimulated us to analyze the role in pathogenesis of catabol ...[more]

PMID: 18230719

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Project description:In Bacillus subtilis and its relatives carbon catabolite control, a mechanism enabling to reach maximal efficiency of carbon and energy sources metabolism, is achieved by the global regulator CcpA (carbon catabolite protein A). CcpA in a complex with HPr-Ser-P (seryl-phosphorylated form of histidine-containing protein, HPr) binds to operator sites called catabolite responsive elements, cre. Depending on the cre box position relative to the promoter, the CcpA/HPr-Ser-P complex can either act as a positive or a negative regulator. The cre boxes are highly degenerate semi-palindromes with a lowly conserved consensus sequence. So far, studies aimed at revealing how CcpA can bind such diverse sites were focused on the analysis of single cre boxes. In this study, a genome-wide analysis of cre sites was performed in order to identify differences in cre sequence and position, which determine their binding affinity. The transcriptomes of B. subtilis cultures with three different CcpA expression levels were compared. The higher the amount of CcpA in the cells, the more operons possessing cre sites were differentially regulated. The cre boxes that mediated regulation at low CcpA levels were designated as strong (high affinity) and those which responded only to high amounts of CcpA, as weak (low affinity). Differences in the sequence and position in relation to the transcription start site between strong and weak cre boxes were revealed. Certain residues at specific positions in the cre box as well as, to a certain extent, a more palindromic nature of cre sequences and the location of cre in close vicinity to the transcription start site contribute to the strength of CcpA-dependent regulation. The main factors contributing to cre regulatory efficiencies, enabling subtle differential control of various subregulons of the CcpA regulon, are identified. Bacillus subtilis strain MP902 [strain MP901 (Ptet-ccpA, KmR) carrying pWH119 (Pxyl-tetR, EmR)] was grown in presence of three different concentrations of Ptet inducer, anhydrotetracycline (ATc), leading to three levels of ccpA expression induction. The control culture was grown in absence of ATc. The total RNA for transcriptome analyses was isolated at OD600 = 0.8 from 16 ml culture. Three independent cultures of each strain (target strains and controls) were used, and cells were sampled for microarray experiment.

Dataset Information

Analysis of the group A Streptococcus CcpA Transcriptome

Publications

A direct link between carbohydrate utilization and virulence in the major human pathogen group A Streptococcus.

Similar Datasets

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