Transcriptomic analysis of bacterial strains in the cbr/crc regulatory system
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA428342 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6436613_1.fastq.gz | Fastqsanger.gz | |||
| SRR6436613_2.fastq.gz | Fastqsanger.gz | |||
| SRR6436614_1.fastq.gz | Fastqsanger.gz | |||
| SRR6436614_2.fastq.gz | Fastqsanger.gz | |||
| SRR6436615_1.fastq.gz | Fastqsanger.gz |
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Project description:We screened a number of virulence genes in Pseudomonas donghuensis HYS, and genes in cbr/crc regulatory system were included. To investigate the relationship between this regulatory system and other virulence genes screened in the study, we performed transcriptome sequencing of strains related to cbr/crc system. Through analyzing the expression quantity, we found that the screened virulence genes were under the regulation of the cbr/crc system.
2018-01-04 | GSE108703 | GEO
Project description:In metabolically versatile bacteria, carbon catabolite repression (CCR) facilitates the preferential assimilation of the most efficient carbon sources, improving growth rate and fitness. In Pseudomonas putida, the Crc protein and the CrcZ and CrcY small RNAs (sRNAs), which are believed to antagonise Crc, are key players in CCR. Contrary to what occurs in other bacterial species, succinate or glucose elicit a weak CCR in this bacterium. We combined metabolic, transcriptomics and constraints-based metabolic flux analyses to clarify whether P. putida prefers succinate or glucose, and the role of the Crc/CrcZ-CrcY regulatory system in their metabolization. Succinate was consumed faster than glucose and allowed a higher growth rate. However, both compounds were co-metabolised when provided simultaneously. The levels of CrcZ and CrcY were lower when both substrates were present than when only one of them was provided, suggesting a role for Crc in coordinating metabolism. Metabolic reconstructions suggested that, when both substrates are present, Crc works to organize a metabolism in which carbon compounds flow in two opposite directions: from glucose to pyruvate, and from succinate to pyruvate. Therefore, Crc serves not only to favour the assimilation of preferred compounds, but also to balance the carbon fluxes, optimising metabolism and growth.
2015-03-06 | GSE63987 | GEO
Project description:The opportunistic human pathogen Pseudomonas aeruginosa can utilize several carbon and nitrogen compounds as energy sources, which allows the bacterium to grow on a variety of different environments. Nevertheless, the uptake and utilization of these compounds is organized in a hierarchical manner, which is guaranteed by a mechanism named catabolite repression. In P. aeruginosa catabolite repression is a post-transcriptional process with the translational repressor protein, Crc, as the main component. Crc recognizes CA-motifs (acronym for catabolite activity) present in the vicinity of the ribosome binfing site of corresponding target mRNAs and therefore compete with ribosome binding. Certain conditions, which are mainly related to changes in the carbon to nitrogen ratio, induce the two component system CbrAB, which activates the transcription of the sRNA CrcZ. The sRNA sequesters Crc and allows the translation of the target mRNAs. The main focus of this study was to identify novel direct targets of the CbrAB/Crc system with the use of a transcriptome analysis in combination with the search for CA-motifs. We were able to identify five novel targets (estA, acsA, dctP, bkdR and aroP2), which were involved in the uptake and utilization of less preferred carbon sources and amino acids. Direct interaction of Crc with these genes and the resulting regulation by CbrB and CrcZ were verified using mutational analysis and in vitro and in vivo experiments. Moreover, these targets were discussed in the light of growth and biofilm development in synthetic CF sputum medium which emphasised the importance of the CbrAB/Crc system as a regulator of chronic infection. keyword(s): genetic modification Comparative transcriptome analysis with the PAO1 wild type strain and PAO6673 (delta crc), PAO66711 (delta cbrB), PAO6679 (delta crcZ) strains grown in BSM-Succinate medium.
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Project description:The opportunistic human pathogen Pseudomonas aeruginosa can utilize several carbon and nitrogen compounds as energy sources, which allows the bacterium to grow on a variety of different environments. Nevertheless, the uptake and utilization of these compounds is organized in a hierarchical manner, which is guaranteed by a mechanism named catabolite repression. In P. aeruginosa catabolite repression is a post-transcriptional process with the translational repressor protein, Crc, as the main component. Crc recognizes CA-motifs (acronym for catabolite activity) present in the vicinity of the ribosome binfing site of corresponding target mRNAs and therefore compete with ribosome binding. Certain conditions, which are mainly related to changes in the carbon to nitrogen ratio, induce the two component system CbrAB, which activates the transcription of the sRNA CrcZ. The sRNA sequesters Crc and allows the translation of the target mRNAs. The main focus of this study was to identify novel direct targets of the CbrAB/Crc system with the use of a transcriptome analysis in combination with the search for CA-motifs. We were able to identify five novel targets (estA, acsA, dctP, bkdR and aroP2), which were involved in the uptake and utilization of less preferred carbon sources and amino acids. Direct interaction of Crc with these genes and the resulting regulation by CbrB and CrcZ were verified using mutational analysis and in vitro and in vivo experiments. Moreover, these targets were discussed in the light of growth and biofilm development in synthetic CF sputum medium which emphasised the importance of the CbrAB/Crc system as a regulator of chronic infection. Comparative transcriptome analysis with the PAO1 wild type strain and PAO6673 (delta crc), PAO66711 (delta cbrB), PAO6679 (delta crcZ) strains grown in LB medium.
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2012-03-31 | E-GEOD-33245 | biostudies-arrayexpress
Project description:The opportunistic human pathogen Pseudomonas aeruginosa can utilize several carbon and nitrogen compounds as energy sources, which allows the bacterium to grow on a variety of different environments. Nevertheless, the uptake and utilization of these compounds is organized in a hierarchical manner, which is guaranteed by a mechanism named catabolite repression. In P. aeruginosa catabolite repression is a post-transcriptional process with the translational repressor protein, Crc, as the main component. Crc recognizes CA-motifs (acronym for catabolite activity) present in the vicinity of the ribosome binfing site of corresponding target mRNAs and therefore compete with ribosome binding. Certain conditions, which are mainly related to changes in the carbon to nitrogen ratio, induce the two component system CbrAB, which activates the transcription of the sRNA CrcZ. The sRNA sequesters Crc and allows the translation of the target mRNAs. The main focus of this study was to identify novel direct targets of the CbrAB/Crc system with the use of a transcriptome analysis in combination with the search for CA-motifs. We were able to identify five novel targets (estA, acsA, dctP, bkdR and aroP2), which were involved in the uptake and utilization of less preferred carbon sources and amino acids. Direct interaction of Crc with these genes and the resulting regulation by CbrB and CrcZ were verified using mutational analysis and in vitro and in vivo experiments. Moreover, these targets were discussed in the light of growth and biofilm development in synthetic CF sputum medium which emphasised the importance of the CbrAB/Crc system as a regulator of chronic infection.
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