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- W2023177772 abstract "ABSTRACT Legionella pneumophila is a waterborne pathogen, and survival in the aquatic environment is central to its transmission to humans. Therefore, identifying genes required for its survival in water could help prevent Legionnaires' disease outbreaks. In the present study, we investigate the role of the sigma factor RpoS in promoting survival in water, where L. pneumophila experiences severe nutrient deprivation. The rpoS mutant showed a strong survival defect compared to the wild-type strain in defined water medium. The transcriptome of the rpoS mutant during exposure to water revealed that RpoS represses genes associated with replication, translation, and transcription, suggesting that the mutant fails to shut down major metabolic programs. In addition, the rpoS mutant is transcriptionally more active than the wild-type strain after water exposure. This could be explained by a misregulation of the stringent response in the rpoS mutant. Indeed, the rpoS mutant shows an increased expression of spoT and a corresponding decrease in the level of (p)ppGpp, which is due to the presence of a negative feedback loop between RpoS and SpoT. Therefore, the lack of RpoS causes an aberrant regulation of the stringent response, which prevents the induction of a successful response to starvation." @default.
- W2023177772 created "2016-06-24" @default.
- W2023177772 creator A5009912584 @default.
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- W2023177772 creator A5079541460 @default.
- W2023177772 date "2015-02-01" @default.
- W2023177772 modified "2023-10-13" @default.
- W2023177772 title "A Regulatory Feedback Loop between RpoS and SpoT Supports the Survival of Legionella pneumophila in Water" @default.
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- W2023177772 doi "https://doi.org/10.1128/aem.03132-14" @default.
- W2023177772 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4292471" @default.
- W2023177772 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25416763" @default.
- W2023177772 hasPublicationYear "2015" @default.
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