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- PDB-7bk0: Salmonella FliF ring (34mer) in intact basal body - C1 -

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Basic information

Database: PDB / ID: 7bk0
TitleSalmonella FliF ring (34mer) in intact basal body - C1
ComponentsFlagellar M-ring protein
KeywordsPROTEIN TRANSPORT / bacterial flagellum basal body MS-ring
Function / homology
Function and homology information

bacterial-type flagellum basal body, MS ring / bacterial-type flagellum-dependent cell motility / motor activity / integral component of membrane / plasma membrane
Similarity search - Function
Flagellar M-ring protein FliF / Flagellar M-ring C-terminal / Flagellar M-ring protein C-terminal / Lipoprotein YscJ/Flagellar M-ring protein / Secretory protein of YscJ/FliF family / Flagellar M-ring , N-terminal
Similarity search - Domain/homology
Flagellar M-ring protein
Similarity search - Component
Biological speciesSalmonella enterica subsp. enterica serovar Typhimurium (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsJohnson, S. / Furlong, E. / Lea, S.M.
Funding support United Kingdom, 4items
OrganizationGrant numberCountry
Wellcome Trust219477 United Kingdom
Wellcome Trust209194 United Kingdom
Wellcome Trust201536 United Kingdom
Medical Research Council (MRC, United Kingdom)S021264 United Kingdom
CitationJournal: Nat Microbiol / Year: 2021
Title: Molecular structure of the intact bacterial flagellar basal body.
Authors: Steven Johnson / Emily J Furlong / Justin C Deme / Ashley L Nord / Joseph J E Caesar / Fabienne F V Chevance / Richard M Berry / Kelly T Hughes / Susan M Lea /
Abstract: The bacterial flagellum is a macromolecular protein complex that enables motility in many species. Bacterial flagella self-assemble a strong, multicomponent drive shaft that couples rotation in the ...The bacterial flagellum is a macromolecular protein complex that enables motility in many species. Bacterial flagella self-assemble a strong, multicomponent drive shaft that couples rotation in the inner membrane to the micrometre-long flagellar filament that powers bacterial swimming in viscous fluids. Here, we present structures of the intact Salmonella flagellar basal body, encompassing the inner membrane rotor, drive shaft and outer-membrane bushing, solved using cryo-electron microscopy to resolutions of 2.2-3.7 Å. The structures reveal molecular details of how 173 protein molecules of 13 different types assemble into a complex spanning two membranes and a cell wall. The helical drive shaft at one end is intricately interwoven with the rotor component with both the export gate complex and the proximal rod forming interactions with the MS-ring. At the other end, the drive shaft distal rod passes through the LP-ring bushing complex, which functions as a molecular bearing anchored in the outer membrane through interactions with the lipopolysaccharide. The in situ structure of a protein complex capping the drive shaft provides molecular insights into the assembly process of this molecular machine.
DepositionJan 14, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 5, 2021Provider: repository / Type: Initial release
Revision 1.1May 19, 2021Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed ..._citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Jun 9, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

Structure visualization

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Deposited unit
A: Flagellar M-ring protein
B: Flagellar M-ring protein
C: Flagellar M-ring protein
D: Flagellar M-ring protein
E: Flagellar M-ring protein
F: Flagellar M-ring protein
G: Flagellar M-ring protein
H: Flagellar M-ring protein
I: Flagellar M-ring protein
J: Flagellar M-ring protein
K: Flagellar M-ring protein
L: Flagellar M-ring protein
M: Flagellar M-ring protein
N: Flagellar M-ring protein
O: Flagellar M-ring protein
P: Flagellar M-ring protein
Q: Flagellar M-ring protein
R: Flagellar M-ring protein
S: Flagellar M-ring protein
T: Flagellar M-ring protein
U: Flagellar M-ring protein
V: Flagellar M-ring protein
W: Flagellar M-ring protein
X: Flagellar M-ring protein
Y: Flagellar M-ring protein
Z: Flagellar M-ring protein
a: Flagellar M-ring protein
b: Flagellar M-ring protein
c: Flagellar M-ring protein
d: Flagellar M-ring protein
e: Flagellar M-ring protein
f: Flagellar M-ring protein
g: Flagellar M-ring protein
h: Flagellar M-ring protein

Theoretical massNumber of molelcules
Total (without water)2,084,05234

  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area195900 Å2
ΔGint-477 kcal/mol
Surface area336210 Å2


#1: Protein ...
Flagellar M-ring protein

Mass: 61295.645 Da / Num. of mol.: 34 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
References: UniProt: P15928

Experimental details


EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

Sample preparation

ComponentName: Flagellar MS-ring / Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 59 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)


EM software
1SIMPLE3particle selection
4SIMPLE3CTF correction
10RELION3.1initial Euler assignment
11RELION3.1final Euler assignment
13RELION3.13D reconstruction
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 60497 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 106.43 Å2
Refine LS restraints
Refinement-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.006958224
ELECTRON MICROSCOPYf_angle_d0.818278706
ELECTRON MICROSCOPYf_chiral_restr0.04789177
ELECTRON MICROSCOPYf_plane_restr0.004410496
ELECTRON MICROSCOPYf_dihedral_angle_d22.38897935

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