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- PDB-7sn4: Cryo-EM structure of the enterohemorrhagic E. coli O157:H7 flagel... -

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Basic information

Entry
Database: PDB / ID: 7sn4
TitleCryo-EM structure of the enterohemorrhagic E. coli O157:H7 flagellar filament
ComponentsFlagellin
KeywordsSTRUCTURAL PROTEIN / Bacteria flagellar filament / motility / flagellar polymorphism
Function / homology
Function and homology information


bacterial-type flagellum / structural molecule activity / extracellular region
Similarity search - Function
Flagellin, H7-serospecific domain / Flagellin protein / Flagellin, C-terminal domain, subdomain 2 / Bacterial flagellin C-terminal helical region / Flagellin / Flagellin, N-terminal domain / Bacterial flagellin N-terminal helical region
Similarity search - Domain/homology
Biological speciesEscherichia coli O157:H7 (bacteria)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsKreutzberger, M.A.B. / Wang, F. / Egelman, E.H.
Funding support1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM122510
CitationJournal: Nat Commun / Year: 2022
Title: Flagellin outer domain dimerization modulates motility in pathogenic and soil bacteria from viscous environments.
Authors: Mark A B Kreutzberger / Richard C Sobe / Amber B Sauder / Sharanya Chatterjee / Alejandro Peña / Fengbin Wang / Jorge A Giron / Volker Kiessling / Tiago R D Costa / Vincent P Conticello / ...Authors: Mark A B Kreutzberger / Richard C Sobe / Amber B Sauder / Sharanya Chatterjee / Alejandro Peña / Fengbin Wang / Jorge A Giron / Volker Kiessling / Tiago R D Costa / Vincent P Conticello / Gad Frankel / Melissa M Kendall / Birgit E Scharf / Edward H Egelman /
Abstract: Flagellar filaments function as the propellers of the bacterial flagellum and their supercoiling is key to motility. The outer domains on the surface of the filament are non-critical for motility in ...Flagellar filaments function as the propellers of the bacterial flagellum and their supercoiling is key to motility. The outer domains on the surface of the filament are non-critical for motility in many bacteria and their structures and functions are not conserved. Here, we show the atomic cryo-electron microscopy structures for flagellar filaments from enterohemorrhagic Escherichia coli O157:H7, enteropathogenic E. coli O127:H6, Achromobacter, and Sinorhizobium meliloti, where the outer domains dimerize or tetramerize to form either a sheath or a screw-like surface. These dimers are formed by 180° rotations of half of the outer domains. The outer domain sheath (ODS) plays a role in bacterial motility by stabilizing an intermediate waveform and prolonging the tumbling of E. coli cells. Bacteria with these ODS and screw-like flagellar filaments are commonly found in soil and human intestinal environments of relatively high viscosity suggesting a role for the dimerization in these environments.
History
DepositionOct 27, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 16, 2022Provider: repository / Type: Initial release
Revision 1.1Mar 30, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name

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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
A: Flagellin
B: Flagellin
C: Flagellin
D: Flagellin
E: Flagellin
F: Flagellin
G: Flagellin
H: Flagellin
I: Flagellin
J: Flagellin
K: Flagellin
L: Flagellin
M: Flagellin
N: Flagellin
O: Flagellin
P: Flagellin
Q: Flagellin
R: Flagellin
S: Flagellin
T: Flagellin
U: Flagellin
V: Flagellin
W: Flagellin
X: Flagellin
Y: Flagellin
Z: Flagellin
a: Flagellin
b: Flagellin
c: Flagellin
d: Flagellin
e: Flagellin
f: Flagellin
g: Flagellin
h: Flagellin
i: Flagellin
j: Flagellin
k: Flagellin
l: Flagellin
m: Flagellin
n: Flagellin
o: Flagellin
p: Flagellin
q: Flagellin
r: Flagellin


Theoretical massNumber of molelcules
Total (without water)2,640,00844
Polymers2,640,00844
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein ...
Flagellin /


Mass: 60000.172 Da / Num. of mol.: 44
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli O157:H7 (bacteria) / Strain: O157:H7 str 86-24 / Gene: fliC, ECs_2662 / Production host: Escherichia coli O157:H7 (bacteria) / Strain (production host): O157:H7 str 86-24 / References: UniProt: Q7AD06

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: Bacterial flagellar filament / Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.2
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.19rc4_4035refinement
PHENIX1.19rc4_4035refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: 9.68 ° / Axial rise/subunit: 130.78 Å / Axial symmetry: C1
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 200000 / Symmetry type: HELICAL
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 150.11 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0031181104
ELECTRON MICROSCOPYf_angle_d0.4853245674
ELECTRON MICROSCOPYf_chiral_restr0.037830448
ELECTRON MICROSCOPYf_plane_restr0.002532472
ELECTRON MICROSCOPYf_dihedral_angle_d3.821325982

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