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- EMDB-41104: 36-mer Flagellar Switch Complex - FliF, FliG, FliM and FliN formi... -

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Basic information

Entry
Database: EMDB / ID: EMD-41104
Title36-mer Flagellar Switch Complex - FliF, FliG, FliM and FliN forming C-ring from Salmonella
Map data
Sample
  • Complex: Flagellar MS-ring and C-ring complex containing FliF, FliG, FliM, and FliN
KeywordsDomain Swap / Symmetry mismatch / Flagellar component / Switch complex / C36 / 36-mer / MOTOR PROTEIN
Biological speciesSalmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 6.7 Å
AuthorsSingh PK / Iverson TM
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/John E. Fogarty International Center (NIH/FIC)GM61606 United States
CitationJournal: Nat Microbiol / Year: 2024
Title: CryoEM structures reveal how the bacterial flagellum rotates and switches direction.
Authors: Prashant K Singh / Pankaj Sharma / Oshri Afanzar / Margo H Goldfarb / Elena Maklashina / Michael Eisenbach / Gary Cecchini / T M Iverson /
Abstract: Bacterial chemotaxis requires bidirectional flagellar rotation at different rates. Rotation is driven by a flagellar motor, which is a supercomplex containing multiple rings. Architectural ...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 Å) and isolated C-ring in a clockwise pose alone (4.6 Å) and bound to a regulator (5.9 Å). Conformational differences between rotational poses include a 180° 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.
History
DepositionJun 23, 2023-
Header (metadata) releaseFeb 28, 2024-
Map releaseFeb 28, 2024-
UpdateSep 11, 2024-
Current statusSep 11, 2024Processing site: RCSB / Status: Released

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Structure visualization

Downloads & links

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Map

FileDownload / File: emd_41104.map.gz / Format: CCP4 / Size: 1.7 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel size
XYZ
EMDB info.1.3931.3931.393
CCP4 map header1.881.881.88
Density
Contour LevelBy AUTHOR: 0.135
Minimum - Maximum-0.11718413 - 0.39254278
Average (Standard dev.)-0.00065452093 (±0.015064449)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions768768768
Spacing768768768
CellA=B=C: 1069.824 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Flagellar MS-ring and C-ring complex containing FliF, FliG, FliM,...

EntireName: Flagellar MS-ring and C-ring complex containing FliF, FliG, FliM, and FliN
Components
  • Complex: Flagellar MS-ring and C-ring complex containing FliF, FliG, FliM, and FliN

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Supramolecule #1: Flagellar MS-ring and C-ring complex containing FliF, FliG, FliM,...

SupramoleculeName: Flagellar MS-ring and C-ring complex containing FliF, FliG, FliM, and FliN
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Molecular weightTheoretical: 3.5 MDa

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 51.557 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER / Details: Ab-initio model
Final reconstructionResolution.type: BY AUTHOR / Resolution: 6.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.2.1) / Number images used: 6041
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.2.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.2.1)

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