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Mechanism of effector capture and delivery by the type IV secretion system from Legionella pneumophila

Meir, A; Macé, K; Lukoyanova, N; Chetrit, D; Hospenthal, MK; Redzej, A; Roy, C; (2020) Mechanism of effector capture and delivery by the type IV secretion system from Legionella pneumophila. Nature Communications , 11 , Article 2864. 10.1038/s41467-020-16681-z. Green open access

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Abstract

Legionella pneumophila is a bacterial pathogen that utilises a Type IV secretion (T4S) system to inject effector proteins into human macrophages. Essential to the recruitment and delivery of effectors to the T4S machinery is the membrane-embedded T4 coupling complex (T4CC). Here, we purify an intact T4CC from the Legionella membrane. It contains the DotL ATPase, the DotM and DotN proteins, the chaperone module IcmSW, and two previously uncharacterised proteins, DotY and DotZ. The atomic resolution structure reveals a DotLMNYZ hetero-pentameric core from which the flexible IcmSW module protrudes. Six of these hetero-pentameric complexes may assemble into a 1.6-MDa hexameric nanomachine, forming an inner membrane channel for effectors to pass through. Analysis of multiple cryo EM maps, further modelling and mutagenesis provide working models for the mechanism for binding and delivery of two essential classes of Legionella effectors, depending on IcmSW or DotM, respectively.

Type: Article
Title: Mechanism of effector capture and delivery by the type IV secretion system from Legionella pneumophila
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41467-020-16681-z
Publisher version: https://doi.org/10.1038/s41467-020-16681-z
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
URI: https://discovery.ucl.ac.uk/id/eprint/10101642
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