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024 7 _ |a 10.1016/j.bbrep.2021.101039
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100 1 _ |a Kotov, Vadim
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245 _ _ |a Helical reconstruction of Salmonella and Shigella needle filaments attached to type 3 basal bodies
260 _ _ |a Amsterdam [u.a.]
|c 2021
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500 _ _ |a Part of this work was performed at the EM facility at CSSB, supported by UHH and DFG grant numbers (INST 152/772–1|152/774–1|152/775–1|152/776–1|152-777-1 FUGG).
520 _ _ |a Gram-negative pathogens evolved a syringe-like nanomachine, termed type 3 secretion system, to deliver protein effectors into the cytoplasm of host cells. An essential component of this system is a long helical needle filament that protrudes from the bacterial surface and connects the cytoplasms of the bacterium and the eukaryotic cell. Previous structural research was predominantly focused on reconstituted type 3 needle filaments, which lacked the biological context. In this work we introduce a facile procedure to obtain high-resolution cryo-EM structure of needle filaments attached to the basal body of type 3 secretion systems. We validate our approach by solving the structure of Salmonella PrgI filament and demonstrate its utility by obtaining the first high-resolution cryo-EM reconstruction of Shigella MxiH filament. Our work paves the way to systematic structural characterization of attached type 3 needle filaments in the context of mutagenesis studies, protein structural evolution and drug development.
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536 _ _ |a FUTURE T3SS - Bacterial effector secretion: Function and Architecture of the Type 3 Secretion System (311374)
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536 _ _ |a iNEXT - Infrastructure for NMR, EM and X-rays for translational research (653706)
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700 1 _ |a Lunelli, Michele
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700 1 _ |a Wald, Jiri
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700 1 _ |a Kolbe, Michael
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700 1 _ |a Marlovits, Thomas
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773 _ _ |a 10.1016/j.bbrep.2021.101039
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