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A study of the YopD-LcrH interaction from Yersinia pseudotuberculosis reveals a role for hydrophobic residues within the amphipathic domain of YopD
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology). Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). (Matthew Francis)ORCID iD: 0000-0001-6817-9535
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology).
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology).
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology). Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR).
2000 (English)In: Molecular Microbiology, ISSN 0950-382X, E-ISSN 1365-2958, Vol. 38, no 1, 85-102 p.Article in journal (Refereed) Published
Abstract [en]

The enteropathogen Yersinia pseudotuberculosis is a model system used to study the molecular mechanisms by which Gram-negative pathogens translocate effector proteins into target eukaryotic cells by a common type III secretion machine. Of the numerous proteins produced by Y. pseudotuberculosis that act in concert to establish an infection, YopD (Yersiniaouter protein D) is a crucial component essential for yop regulation and Yop effector translocation. In this study, we describe the mechanisms by which YopD functions to control these processes. With the aid of the yeast two-hybrid system, we investigated the interaction between YopD and the cognate chaperone LcrH. We confirmed that non-secreted LcrH is necessary for YopD stabilization before secretion, presumably by forming a complex with YopD in the bacterial cytoplasm. At least in yeast, this complex depends upon the N-terminal domain and a C-terminal amphipathic α-helical domain of YopD. Introduction of amino acid substitutions within the hydrophobic side of the amphipathic α-helix abolished the YopD–LcrH interaction, indicating that hydrophobic, as opposed to electrostatic, forces of attraction are important for this process. Suppressor mutations isolated within LcrH could compensate for defects in the amphipathic domain of YopD to restore binding. Isolation of LcrH mutants unable to interact with wild-type YopD revealed no single domain responsible for YopD binding. The YopD and LcrH mutants generated in this study will be relevant tools for understanding YopD function during a Yersinia infection.

Place, publisher, year, edition, pages
Blackwell Publishing, 2000. Vol. 38, no 1, 85-102 p.
National Category
Natural Sciences
Research subject
Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-59477DOI: DOI: 10.1046/j.1365-2958.2000.02112.xOAI: oai:DiVA.org:umu-59477DiVA: diva2:552522
Funder
Swedish Research Council
Available from: 2012-09-14 Created: 2012-09-14 Last updated: 2017-12-07

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Publisher's full texthttp://onlinelibrary.wiley.com/doi/10.1046/j.1365-2958.2000.02112.x/full

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