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Dual input control : activation of the Bartonella henselae VirB/D4 type IV secretion system by the stringent sigma factor RpoH1 and the BatR/BatS two-component system

Québatte, Maxime and Dick, Mathias S. and Kaever, Volkhard and Schmidt, Alexander and Dehio, Christoph. (2013) Dual input control : activation of the Bartonella henselae VirB/D4 type IV secretion system by the stringent sigma factor RpoH1 and the BatR/BatS two-component system. Molecular microbiology, Vol. 90, H. 4. pp. 756-775.

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Official URL: http://edoc.unibas.ch/dok/A6328962

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Abstract

The co-ordinated expression of virulence factors is a critical process for any bacterial pathogen to colonize its host. Here we investigated the mechanisms of niche adaptation of the zoonotic pathogen Bartonella henselae by combining genetic approaches and shotgun proteomics. We demonstrated that expression of the VirB/D4 type IV secretion system (T4SS) and its secreted effector proteins require the alternative sigma factor RpoH1, which levels are controlled by the stringent response (SR) components DksA and SpoT. The RpoH1-dependent activation requires an active BatR/BatS two-component system (TCS) while BatR expression is controlled by RpoH1 and the SR components. Deletion of spoT results in a strong attenuation of VirB/D4 T4SS expression whereas dksA, rpoH1 or batR deletion fully abolishes its activity. In contrast to their activating effect on the VirB/D4 T4SS, which is critical at the early stage of host infection, SpoT and DksA negatively regulate the Trw T4SS, which mediates host-specific erythrocyte infection at a later stage of the colonization process. Our findings support a model where the SR signalling and the physiological pH-induced BatR/BatS TCS conjointly control the spatiotemporal expression of B. henselae adaptation factors during host infection.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Services Biozentrum > Proteomics (Schmidt)
UniBasel Contributors:Schmidt, Alexander
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Blackwell
ISSN:0950-382X
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:09 Jan 2015 09:25
Deposited On:09 Jan 2015 09:25

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