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Yersinia Ysc-Yop type III secretion feedback inhibition is relieved through YscV-dependent recognition and secretion of LcrQ
Center for Emerging Infectious Diseases, Wuhan Institute of Virology, The Chinese Academy of Sciences, Wuhan, China.
Center for Emerging Infectious Diseases, Wuhan Institute of Virology, The Chinese Academy of Sciences, Wuhan, China.
Center for Emerging Infectious Diseases, Wuhan Institute of Virology, The Chinese Academy of Sciences, Wuhan, China.
Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). (Matthew Francis)ORCID iD: 0000-0001-6817-9535
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2014 (English)In: Molecular Microbiology, ISSN 0950-382X, E-ISSN 1365-2958, Vol. 91, no 3, 494-507 p.Article in journal (Refereed) Published
Abstract [en]

Human pathogenic Yersinia species share a virulence plasmid encoding the Ysc-Yop type III secretion system (T3SS). A plasmid-encoded anti-activator, LcrQ, negatively regulates the expression of this secretion system. Under inducible conditions, LcrQ is secreted outside of bacterial cells and this activates the T3SS, but the mechanism of targeting LcrQ for type III secretion remains largely unknown. In this study, we characterized the regulatory role of the export apparatus component YscV. Depletion or overexpression of YscV compromised Yop synthesis and this primarily prevented secretion of LcrQ. It followed that a lcrQ deletion reversed the repressive effects of excessive YscV. Further characterization demonstrated that the YscV residues 493–511 located within the C-terminal soluble cytoplasmic domain directly bound with LcrQ. Critically, YscV-LcrQ complex formation was a requirement for LcrQ secretion, since YscVΔ493–511 failed to secrete LcrQ. This forced a cytoplasmic accumulation of LcrQ, which predictably caused the feedback inhibition of Yops synthesis. Based on these observations, we proposed a model for the YscV-dependent secretion of LcrQ and its role in regulating Yop synthesis in Yersinia.

Place, publisher, year, edition, pages
John Wiley & Sons, 2014. Vol. 91, no 3, 494-507 p.
Keyword [en]
T3SS, YscV, LcrQ, Yersinia, Export apparatus
National Category
Microbiology Microbiology in the medical area Biochemistry and Molecular Biology Cell and Molecular Biology
Research subject
Molecular Biology; Microbiology
Identifiers
URN: urn:nbn:se:umu:diva-85894DOI: 10.1111/mmi.12474ISI: 000345498000005Scopus ID: 2-s2.0-84890320543OAI: oai:DiVA.org:umu-85894DiVA: diva2:696068
Available from: 2014-02-12 Created: 2014-02-12 Last updated: 2017-12-06Bibliographically approved

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