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- W2103996389 abstract "Summary The CovR/S two‐component system regulates the transcription of many genes that are crucial for the virulence of Streptococcus pyogenes (group A Streptococcus , GAS). Previously, we demonstrated that one gene repressed directly by CovR is rivR , which encodes a member of the RofA‐like family of transcriptional regulators. In this study, we deleted rivR and its downstream gene rivX in a ΔcovR background. Microarray analysis revealed that the products of the rivRX locus exert positive control over the transcription of members of the Mga regulon. Using mutational analysis, we established that rivX encodes a small regulatory RNA. We found that RivR enhances transcriptional activation by Mga in vivo and in vitro . An M1 Δ covR Δ rivRX strain is attenuated for virulence in a murine model of invasive soft tissue infection and this attenuation is complemented by rivRX expressed from a plasmid, demonstrating the importance of the rivRX locus in pathogenesis. This study provides the first link between the CovR and Mga regulatory networks. By integrating the signals received through these two global regulators, GAS is able to select from its repertoire different combinations of specific virulence factors to express in response to a broad spectrum of environmental conditions." @default.
- W2103996389 created "2016-06-24" @default.
- W2103996389 creator A5078248445 @default.
- W2103996389 creator A5090847527 @default.
- W2103996389 date "2007-11-13" @default.
- W2103996389 modified "2023-10-16" @default.
- W2103996389 title "RivR and the small RNA RivX: the missing links between the CovR regulatory cascade and the Mga regulon" @default.
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- W2103996389 doi "https://doi.org/10.1111/j.1365-2958.2007.06015.x" @default.
- W2103996389 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18005100" @default.
- W2103996389 hasPublicationYear "2007" @default.
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