National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01 AI127401
United States
Howard Hughes Medical Institute (HHMI)
United States
Citation
Journal: Cell Rep / Year: 2018 Title: In Vivo Structures of the Helicobacter pylori cag Type IV Secretion System. Authors: Yi-Wei Chang / Carrie L Shaffer / Lee A Rettberg / Debnath Ghosal / Grant J Jensen / Abstract: The type IV secretion system (T4SS) is a versatile nanomachine that translocates diverse effector molecules between microbes and into eukaryotic cells. Here, using electron cryotomography, we reveal ...The type IV secretion system (T4SS) is a versatile nanomachine that translocates diverse effector molecules between microbes and into eukaryotic cells. Here, using electron cryotomography, we reveal the molecular architecture of the Helicobacter pylori cag T4SS. Although most components are unique to H. pylori, the cag T4SS exhibits remarkable architectural similarity to other T4SSs. Our images revealed that, when H. pylori encounters host cells, the bacterium elaborates membranous tubes perforated by lateral ports. Sub-tomogram averaging of the cag T4SS machinery revealed periplasmic densities associated with the outer membrane, a central stalk, and peripheral wing-like densities. Additionally, we resolved pilus-like rod structures extending from the cag T4SS into the inner membrane, as well as densities within the cytoplasmic apparatus corresponding to a short central barrel surrounded by four longer barrels. Collectively, these studies reveal the structure of a dynamic molecular machine that evolved to function in the human gastric niche.
History
Deposition
Feb 21, 2018
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Header (metadata) release
Apr 18, 2018
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Map release
Apr 18, 2018
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Update
Dec 11, 2019
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Current status
Dec 11, 2019
Processing site: RCSB / Status: Released
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