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Effect on gene expression of addition of N-acetylmannosamine to galactose grown Streptococcus pneumoniae.

ABSTRACT: Effect on gene expression of addition of N-acetylmannosamine to galactose grown Streptococcus pneumoniae.

PROVIDER: PRJNA1032914 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26551553.fastq.gz	Fastqsanger.gz
	SRR26551554.fastq.gz	Fastqsanger.gz
	SRR26551555.fastq.gz	Fastqsanger.gz
	SRR26551556.fastq.gz	Fastqsanger.gz
	SRR26551557.fastq.gz	Fastqsanger.gz

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Project description:Comparison of Streptococcus pneumoniae D39 ccpA mutant compared to D39 wild type in CDM with galactose as sole carbon source to define the regulon of carbon catabolite control protein CcpA under this condition Details described in Carvalho SM, Kloosterman TG, Neves AR, Kuipers OP. CcpA Ensures Optimal Metabolic Fitness of Streptococcus pneumoniae. Plos One 2011

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Project description:Microbes communicate with each other by using quorum sensing (QS) systems and modulate their collective ‘behavior’ for in-host colonization and virulence, biofilm formation, and environmental adaptation. The recent increase in genome data availability reveals the presence of several putative QS sensing circuits in microbial pathogens, but many of these have not been functionally characterized yet, despite their possible utility as drug targets. To increase the repertoire of functionally characterized QS systems in bacteria, we studied Rgg144/Shp144 and Rgg939/Shp939, two putative QS systems in the important human pathogen Streptococcus pneumoniae. We find that both of these QS circuits are induced by short hydrophobic peptides (Shp) upon sensing sugars found in the respiratory tract, such as galactose and mannose. Microarray analyses using cultures grown on mannose and galactose revealed that the expression of a large number of genes is controlled by these QS systems, especially those encoding for essential physiological functions and virulence-related genes such as the capsular locus. Moreover, the array data revealed evidence for cross-talk between these systems. Finally, these Rgg systems play a key role in colonization and virulence, as deletion mutants of these QS systems are attenuated in the mouse models of colonization and pneumonia.

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