8t8o

CCW Flagellar Switch Complex - FliF, FliG, FliM, and FliN forming 34-mer C-ring from Salmonella

spinqualitylabelsall models 8t8o, resolution 4.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8t8o is a 204 chain structure with sequence from Salmonella enterica subsp. enterica serovar Typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 4Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FLIF_SALTY The M ring may be actively involved in energy transduction. Publication Abstract from PubMed Bacterial chemotaxis requires bidirectional flagellar rotation at different rates. Rotation is driven by a flagellar motor, which is a supercomplex containing multiple rings. Architectural uncertainty regarding the cytoplasmic C-ring, or 'switch', limits our understanding of how the motor transmits torque and direction to the flagellar rod. Here we report cryogenic electron microscopy structures for Salmonella enterica serovar typhimurium inner membrane MS-ring and C-ring in a counterclockwise pose (4.0 A) and isolated C-ring in a clockwise pose alone (4.6 A) and bound to a regulator (5.9 A). Conformational differences between rotational poses include a 180 degrees shift in FliF/FliG domains that rotates the outward-facing MotA/B binding site to inward facing. The regulator has specificity for the clockwise pose by bridging elements unique to this conformation. We used these structures to propose how the switch reverses rotation and transmits torque to the flagellum, which advances the understanding of bacterial chemotaxis and bidirectional motor rotation. CryoEM structures reveal how the bacterial flagellum rotates and switches direction.,Singh PK, Sharma P, Afanzar O, Goldfarb MH, Maklashina E, Eisenbach M, Cecchini G, Iverson TM Nat Microbiol. 2024 May;9(5):1271-1281. doi: 10.1038/s41564-024-01674-1. Epub , 2024 Apr 17. PMID:38632342 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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