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- EMDB-17419: Campylobacter jejuni flagellar motor, FlgQ-mCherry fusion -

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Basic information

Entry
Database: EMDB / ID: EMD-17419
TitleCampylobacter jejuni flagellar motor, FlgQ-mCherry fusion
Map dataStructure of the Campylobacter jejuni flagellar motor with mCherry-tagged FlgQ
Sample
  • Organelle or cellular component: Campylobacter jejuni flagellar motor, in FlgQ-mCherry fusion background
Keywordsmolecular machine / bacterial flagellar motor / molecular evolution / in situ / MOTOR PROTEIN
Biological speciesCampylobacter jejuni (Campylobacter)
Methodsubtomogram averaging / cryo EM / Resolution: 81.0 Å
AuthorsDrobnic T / Hendrixson DR / Beeby M
Funding support United Kingdom, United States, 6 items
OrganizationGrant numberCountry
Biotechnology and Biological Sciences Research Council (BBSRC)BB/M011178/1 United Kingdom
Medical Research Council (MRC, United Kingdom)MR/V000799/1 United Kingdom
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01AI065539 United States
Cancer Research UKFC001143 United Kingdom
Wellcome TrustFC001143 United Kingdom
Medical Research Council (MRC, United Kingdom)FC001143 United Kingdom
CitationJournal: bioRxiv / Year: 2024
Title: Molecular model of a bacterial flagellar motor reveals a "parts-list" of protein adaptations to increase torque.
Authors: Tina Drobnič / Eli J Cohen / Tom Calcraft / Mona Alzheimer / Kathrin Froschauer / Sarah Svensson / William H Hoffmann / Nanki Singh / Sriram G Garg / Louie Henderson / Trishant R Umrekar / ...Authors: Tina Drobnič / Eli J Cohen / Tom Calcraft / Mona Alzheimer / Kathrin Froschauer / Sarah Svensson / William H Hoffmann / Nanki Singh / Sriram G Garg / Louie Henderson / Trishant R Umrekar / Andrea Nans / Deborah Ribardo / Francesco Pedaci / Ashley L Nord / Georg K A Hochberg / David R Hendrixson / Cynthia M Sharma / Peter B Rosenthal / Morgan Beeby /
Abstract: One hurdle to understanding how molecular machines work, and how they evolve, is our inability to see their structures . Here we describe a minicell system that enables cryogenic electron microscopy ...One hurdle to understanding how molecular machines work, and how they evolve, is our inability to see their structures . Here we describe a minicell system that enables cryogenic electron microscopy imaging and single particle analysis to investigate the structure of an iconic molecular machine, the bacterial flagellar motor, which spins a helical propeller for propulsion. We determine the structure of the high-torque motor including the subnanometre-resolution structure of the periplasmic scaffold, an adaptation essential to high torque. Our structure enables identification of new proteins, and interpretation with molecular models highlights origins of new components, reveals modifications of the conserved motor core, and explain how these structures both template a wider ring of motor proteins, and buttress the motor during swimming reversals. We also acquire insights into universal principles of flagellar torque generation. This approach is broadly applicable to other membrane-residing bacterial molecular machines complexes.
History
DepositionMay 23, 2023-
Header (metadata) releaseOct 30, 2024-
Map releaseOct 30, 2024-
UpdateJul 16, 2025-
Current statusJul 16, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_17419.png

Downloads & links

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Map

FileDownload / File: emd_17419.map.gz / Format: CCP4 / Size: 93 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of the Campylobacter jejuni flagellar motor with mCherry-tagged FlgQ
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
7 Å/pix.
x 290 pix.
= 2030.58 Å		7 Å/pix.
x 290 pix.
= 2030.58 Å		7 Å/pix.
x 290 pix.
= 2030.58 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 7.002 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.15
Minimum - Maximum-3.7067027 - 4.309272
Average (Standard dev.)0.28798494 (±0.8081714)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions290290290
Spacing290290290
CellA=B=C: 2030.58 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_17419_msk_1.map
Projections & Slices
AxesZYX

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Additional map: Structure of the Campylobacter jejuni flagellar motor with...

Fileemd_17419_additional_1.map
AnnotationStructure of the Campylobacter jejuni flagellar motor with mCherry-tagged FlgQ, unsymmetrized
Projections & Slices
AxesZYX

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Histogram

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Half map: Structure of the Campylobacter jejuni flagellar motor with...

Fileemd_17419_half_map_1.map
AnnotationStructure of the Campylobacter jejuni flagellar motor with mCherry-tagged FlgQ, half map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Structure of the Campylobacter jejuni flagellar motor with...

Fileemd_17419_half_map_2.map
AnnotationStructure of the Campylobacter jejuni flagellar motor with mCherry-tagged FlgQ, half map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Campylobacter jejuni flagellar motor, in FlgQ-mCherry fusion back...

EntireName: Campylobacter jejuni flagellar motor, in FlgQ-mCherry fusion background
Components
  • Organelle or cellular component: Campylobacter jejuni flagellar motor, in FlgQ-mCherry fusion background

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Supramolecule #1: Campylobacter jejuni flagellar motor, in FlgQ-mCherry fusion back...

SupramoleculeName: Campylobacter jejuni flagellar motor, in FlgQ-mCherry fusion background
type: organelle_or_cellular_component / ID: 1 / Parent: 0
Source (natural)Organism: Campylobacter jejuni (Campylobacter) / Strain: 81-176

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Experimental details

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Structure determination

Methodcryo EM
Processingsubtomogram averaging
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4 / Details: PBS
GridModel: Quantifoil R2/2 / Material: COPPER
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Instrument: FEI VITROBOT MARK IV
DetailsCells were grown on MH agar, resuspended in PBS and concentrated to theoretical OD600 ~10

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Electron microscopy

MicroscopeFEI TECNAI F20
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Average electron dose: 3.3 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 5.0 µm / Nominal defocus min: 3.5 µm
Experimental equipment
Model: Tecnai F20 / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Point group: C17 (17 fold cyclic) / Algorithm: SIMULTANEOUS ITERATIVE (SIRT) / Resolution.type: BY AUTHOR / Resolution: 81.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: Dynamo (ver. 1.1.532) / Number subtomograms used: 155
ExtractionNumber tomograms: 155 / Number images used: 155 / Reference model: from data / Method: manual annotation
CTF correctionType: NONE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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