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Yersinia pseudotuberculosis ymoA mutant vs. wild type YPIII

ABSTRACT: Expression of the virulence regulator RovA of Yersinia pseudotuberculosis, is controlled by the ncRNAs CsrB and CsrC through CsrA and RovM. In this study, we show that the regulator YmoA of the Hha family of nucleoid-associated proteins controls expression of the counterregulated Csr-type RNAs and the Csr-RovM-RovA signalling cascade through alterations of the CsrC RNA stability. YmoA-mediated stabilization of CsrC depends on CsrA and H-NS, but not on the RNA chaperone Hfq and involves a stabilizing stem-loop structure within the 5’-region of CsrC. YmoA influence on CsrC stability is complex as YmoA was found to control numerous factors known to affect RNA structures and stability. In addition, YmoA controls temperature-dependent early and later stage virulence genes in an opposite manner and coregulates their expression with bacterial stress responses and metabolic functions. Following oral infections in a mouse model, we demonstrate that a ymoA mutant is strongly reduced in its ability to disseminate to the Peyer’s patches, mesenteric lymph nodes, liver and spleen and exhibits a reduced mortality. We propose a model in which YmoA controls switching from a RovA-dependent early colonization phase towards a virulence plasmid (pYV)-dependent infection phase important for host defense and persistence.

ORGANISM(S): Yersinia pseudotuberculosis YPIII Yersinia pseudotuberculosis

PROVIDER: GSE35043 | GEO | 2012/07/31

SECONDARY ACCESSION(S): PRJNA150873

REPOSITORIES: GEO

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Project description:Colonization of the intestinal tract and dissemination into deeper tissues by the enteric pathoÂgen Yersinia pseudotuberculosis demands expression of a special set of virulence factors important for the initiation and the persistence of the infection. In this study we demonstrate that many virulence-associated functions are coregulated with the carbohydrate metabolism. This link is mediated by the carbon storage regulator (Csr) system, including the regulatory RNAs CsrB and CsrC, and the cAMP receptor protein (Crp), which both control virulence gene expression in response to the nutrient composition of the medium. Here, we show that Crp regulates the synthesis of both Csr RNAs in an opposite manner. A loss of the crp gene resulted in a strong upregulation of CsrB synthesis, whereas CsrC levels were strongly reduced leading to downregulation of the viruÂlence regulator RovA. Switching of the Csr RNA involves Crp-mediated reÂpression of the response regulator UvrY which activates csrB transcription. To elucidate the regulatory links between virulence and carbon metabolism, we performed comparative metabolome, transÂÂÂcripÂtome and phenotypic microarray analyses and found that Crp promotes oxidative catabolism of many different carbon sources, whereas fermentative patterns of metabolism are favoured when crp is deleted. Mouse infection experiments further demonstrated that Crp is pivotal for a successÂful Y. pseudoÂtuberÂculosis infection. In summary, placement of the Csr system and important virulence factors under control of Crp enables this pathogen to link its nutritional status to virulence in order to optimize bioÂlogical fitness and infection efficiency through the infecÂtious life cycle. Y. pseudotuberculosis YPIII or the isogenic crp mutant strain were grown to late stationary phase at 25Â°C. Four biological replicates were employed for each experiment consisting of two pooled individual cultures and two pooled RNA preparation samples, respectively. Total RNA was extracted using SV Total RNA Isolation System (Promega). The samples were treated with RNase-free DNase (Roche Applied Science) and the quality of the RNA was confirmed by the lack of PCR amplification of the hns gene and by using an Agilent 2100 Bioanalyzer.

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Yersinia pseudotuberculosis ymoA mutant vs. wild type YPIII

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