A Refined Model of the Prototypical Salmonella SPI-1 T3SS Basal Body Reveals the Molecular Basis for Its Assembly

Julien R. C. Bergeron; Liam J. Worrall; Nikolaos G. Sgourakis; Frank Dimaio; Richard A. Pfuetzner; Heather B. Felise; Marija Vuckovic; Angel C. Yu; Samuel I. Miller; David Baker; Natalie C. J. Strynadka; Tomoko Kubori

doi:10.1371/journal.ppat.1003307

A Refined Model of the Prototypical Salmonella SPI-1 T3SS Basal Body Reveals the Molecular Basis for Its Assembly

Julien R. C. Bergeron, Liam J. Worrall, Nikolaos G. Sgourakis, Frank Dimaio, Richard A. Pfuetzner, Heather B. Felise, Marija Vuckovic, Angel C. Yu, Samuel I. Miller, David Baker, Natalie C. J. Strynadka, Tomoko Kubori (Editor)

Randall Centre of Cell & Molecular Biophysics

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69 Citations (Scopus)

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Abstract

The T3SS injectisome is a syringe-shaped macromolecular assembly found in pathogenic Gram-negative bacteria that allows for the direct delivery of virulence effectors into host cells. It is composed of a “basal body”, a lock-nut structure spanning both bacterial membranes, and a “needle” that protrudes away from the bacterial surface. A hollow channel spans throughout the apparatus, permitting the translocation of effector proteins from the bacterial cytosol to the host plasma membrane. The basal body is composed largely of three membrane-embedded proteins that form oligomerized concentric rings. Here, we report the crystal structures of three domains of the prototypical Salmonella SPI-1 basal body, and use a new approach incorporating symmetric flexible backbone docking and EM data to produce a model for their oligomeric assembly. The obtained models, validated by biochemical and in vivo assays, reveal the molecular details of the interactions driving basal body assembly, and notably demonstrate a conserved oligomerization mechanism.

Original language	English
Article number	e1003307
Journal	PLoS Pathogens
Volume	9
Issue number	4
DOIs	https://doi.org/10.1371/journal.ppat.1003307
Publication status	E-pub ahead of print - 25 Apr 2013

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A Refined Model of_BERGERON_Epub25Apr2013_GOLD VoR(CC BY)Final published version, 1.18 MBLicence: CC BY

https://dx.plos.org/10.1371/journal.ppat.1003307

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Bergeron, J. R. C., Worrall, L. J., Sgourakis, N. G., Dimaio, F., Pfuetzner, R. A., Felise, H. B., Vuckovic, M., Yu, A. C., Miller, S. I., Baker, D., Strynadka, N. C. J., & Kubori, T. (Ed.) (2013). A Refined Model of the Prototypical Salmonella SPI-1 T3SS Basal Body Reveals the Molecular Basis for Its Assembly. PLoS Pathogens, 9(4), Article e1003307. Advance online publication. https://doi.org/10.1371/journal.ppat.1003307

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AU - Dimaio, Frank

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A Refined Model of the Prototypical Salmonella SPI-1 T3SS Basal Body Reveals the Molecular Basis for Its Assembly

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