Regulatory Effects of CsrA in Vibrio cholerae
| Autor: | Alexander A. Crofts, Ashley L. Ciosek, Alexandra R. Mey, Heidi A. Butz, Bryan William Davies, Shelley M. Payne |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
AphA
Molecular Biology and Physiology Mutant Virulence Biology medicine.disease_cause Microbiology Bacterial Proteins Sigma factor Virology medicine CsrA Gene Vibrio cholerae Genetics Regulation of gene expression fungi food and beverages RNA-Binding Proteins Gene Expression Regulation Bacterial QR1-502 Regulon regulon Trans-Activators Transcriptome rpoS Research Article |
| Zdroj: | mBio mBio, Vol 12, Iss 1 (2021) |
| ISSN: | 2150-7511 |
| Popis: | Vibrio cholerae, a Gram-negative bacterium, is a natural inhabitant of the aqueous environment. However, once ingested, this bacterium can colonize the human host and cause the disease cholera. CsrA is a posttranscriptional global regulator in Vibrio cholerae. Although CsrA is critical for V. cholerae survival within the mammalian host, the regulatory targets of CsrA remain mostly unknown. To identify pathways controlled by CsrA, RNA-seq transcriptome analysis was carried out by comparing the wild type and the csrA mutant grown to early exponential, mid-exponential, and stationary phases of growth. This enabled us to identify the global effects of CsrA-mediated regulation throughout the V. cholerae growth cycle. We found that CsrA regulates 22% of the V. cholerae transcriptome, with significant regulation within the gene ontology (GO) processes that involve amino acid transport and metabolism, central carbon metabolism, lipid metabolism, iron uptake, and flagellum-dependent motility. Through CsrA-RNA coimmunoprecipitation experiments, we found that CsrA binds to multiple mRNAs that encode regulatory proteins. These include transcripts encoding the major sigma factors RpoS and RpoE, which may explain how CsrA regulation affects such a large proportion of the V. cholerae transcriptome. Other direct targets include flrC, encoding a central regulator in flagellar gene expression, and aphA, encoding the virulence gene transcription factor AphA. We found that CsrA binds to the aphA mRNA both in vivo and in vitro, and CsrA significantly increases AphA protein synthesis. The increase in AphA was due to increased translation, not transcription, in the presence of CsrA, consistent with CsrA binding to the aphA transcript and enhancing its translation. CsrA is required for the virulence of V. cholerae and this study illustrates the central role of CsrA in virulence gene regulation. |
| Databáze: | OpenAIRE |
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