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Streptococcus salivarius CAG:79

ABSTRACT: Streptococcus salivarius CAG:79 overview

PROVIDER: PRJNA207239 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	CBKD01.dat.gz	Other
	CBKD01.fasta.gz	Fasta.gz
	CBKD01.master.dat	Other

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Circuitry rewiring directly couples competence to predation in the gut-dweller Streptococcus salivarius

Project description:Small distortions in transcriptional networks might lead to drastic phenotypical changes, especially in cellular developmental programs such as competence for natural transformation. Here, we report a pervasive circuitry rewiring for competence and predation interplay in commensal streptococci. Canonically, in model species of streptococci such as Streptococcus pneumoniae and Streptococcus mutans, the pheromone-based two-component system BlpRH is a central node that orchestrates the production of antimicrobial compounds (bacteriocins) and incorporates signal from the competence activation cascade. However, the human commensal Streptococcus salivarius does not contain a functional BlpRH pair and in this species, the competence signaling system ComRS directly couples bacteriocin production and competence commitment. This network shortcut might account for an optimal reaction against microbial competitors and could explain the high prevalence of S. salivarius in the human digestive tract. Moreover, the broad spectrum of bacteriocin activity against pathogenic bacteria showcases the commensal and genetically tractable S. salivarius species as a user-friendly model for natural transformation and bacterial predation.

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A study on the impact of the absence of the NIP or NrpR gene on gene expression of Streptococcus salivarius K12 (SAL)

Project description:NIP and NrpR forms a pair for the transcriptional regulator in Streptococcus salivarius K12 (SAL). To explore the target genes regulated by the NIP-NrpR pair in Streptococcus salivarius K12 (SAL), we generated mutants in which the NIP or NrpR gene has been knocked down through complement recombination. Comparative transcriptome profiling of WT, ▲nrpR, and nip* mutant strains revealed that the sar BGC is the major regulatory target controlled by the NIP signaling pathway in SAL.

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Molecular singularities in a pheromone sensor triumvirate desynchronize the competence-predation interplay in the human commensal Streptococcus salivarius

Project description:The human oral cavity is one of the most competing environments, considering the extent and diversity of the bacterial community that colonizes it, as well as the multiple stresses to which it is subjected. The commensal species Streptococcus salivarius is one of the first colonizers of the oral mucosa (tongue, gums, inner cheeks and tooth enamel) in infants and remains predominant throughout the life of an adult. In order to adapt to diverse and variable environmental conditions, S. salivarius triggers in a coordinated way two bacterial developmental processes: competence (acquisition of extracellular DNA and new genetic traits) and predation (secretion of cytotoxic molecule), via ComR, a transcription factor activatable by a "pheromone" peptide. Nevertheless, the activation of other transcriptional regulators can uncouple these 2 mechanisms to allow, for example, only the production of toxins without triggering the competence phase.

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