% IMPORTANT: The following is UTF-8 encoded. This means that in the presence % of non-ASCII characters, it will not work with BibTeX 0.99 or older. % Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or % “biber”. @ARTICLE{Lunelli:602316, author = {Lunelli, Michele and Kamprad, Antje and Bürger, Jörg and Mielke, Thorsten and Spahn, Christian M. T. and Kolbe, Michael}, title = {{C}ryo-{EM} structure of the {S}higella type {III} needle complex}, journal = {PLoS pathogens}, volume = {16}, number = {2}, issn = {1553-7366}, address = {Lawrence, Kan.}, publisher = {PLoS}, reportid = {PUBDB-2024-00591}, pages = {e1008263}, year = {2020}, abstract = {The Type III Secretion Systems (T3SS) needle complex is a conserved syringe-shaped protein translocation nanomachine with a mass of about 3.5 MDa essential for the survival and virulence of many Gram-negative bacterial pathogens. This system is composed of a membrane-embedded basal body and an extracellular needle that deliver effector proteins into host cells. High-resolution structures of the T3SS from different organisms and infection stages are needed to understand the underlying molecular mechanisms of effector translocation. Here, we present the cryo-electron microscopy structure of the isolated Shigella T3SS needle complex. The inner membrane (IM) region of the basal body adopts 24-fold rotational symmetry and forms a channel system that connects the bacterial periplasm with the export apparatus cage. The secretin oligomer adopts a heterogeneous architecture with 16- and 15-fold cyclic symmetry in the periplasmic N-terminal connector and C-terminal outer membrane ring, respectively. Two out of three IM subunits bind the secretin connector via a β-sheet augmentation. The cryo-EM map also reveals the helical architecture of the export apparatus core, the inner rod, the needle and their intervening interfaces.}, cin = {CSSB-HZI-MK}, ddc = {610}, cid = {I:(DE-H253)CSSB-HZI-MK-20210520}, pnm = {899 - ohne Topic (POF4-899) / iNEXT - Infrastructure for NMR, EM and X-rays for translational research (653706) / FUTURE T3SS - Bacterial effector secretion: Function and Architecture of the Type 3 Secretion System (311374)}, pid = {G:(DE-HGF)POF4-899 / G:(EU-Grant)653706 / G:(EU-Grant)311374}, experiment = {EXP:(DE-MLZ)NOSPEC-20140101}, typ = {PUB:(DE-HGF)16}, pubmed = {pmid:32092125}, UT = {WOS:000518637800012}, doi = {10.1371/journal.ppat.1008263}, url = {https://bib-pubdb1.desy.de/record/602316}, }