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- PDB-8wlq: Cryo-EM structure of the whole rod-export apparatus with hook wit... -

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Basic information

Entry
Database: PDB / ID: 8wlq
TitleCryo-EM structure of the whole rod-export apparatus with hook within the flagellar motor-hook complex in the CCW state.
Components
  • (Flagellar basal-body rod protein ...) x 3
  • (Flagellar biosynthetic protein ...) x 3
  • Flagellar M-ring protein
  • Flagellar basal body rod protein FlgB
  • Flagellar hook protein FlgE
  • Flagellar hook-basal body complex protein FliE
KeywordsMOTOR PROTEIN / Flagellum / Flagellar motor
Function / homology
Function and homology information


bacterial-type flagellum basal body, distal rod / bacterial-type flagellum basal body, rod / bacterial-type flagellum organization / bacterial-type flagellum hook / bacterial-type flagellum basal body, MS ring / bacterial-type flagellum basal body / bacterial-type flagellum-dependent swarming motility / bacterial-type flagellum / bacterial-type flagellum assembly / cytoskeletal motor activity ...bacterial-type flagellum basal body, distal rod / bacterial-type flagellum basal body, rod / bacterial-type flagellum organization / bacterial-type flagellum hook / bacterial-type flagellum basal body, MS ring / bacterial-type flagellum basal body / bacterial-type flagellum-dependent swarming motility / bacterial-type flagellum / bacterial-type flagellum assembly / cytoskeletal motor activity / protein secretion / bacterial-type flagellum-dependent cell motility / protein targeting / structural molecule activity / plasma membrane / cytosol
Similarity search - Function
Flagellar basal-body rod protein FlgC / Flagellar basal-body rod FlgG / Flagellar hook-basal body complex protein FliE / Flagellar basal-body rod protein FlgB / Flagellar hook-basal body complex protein FliE / Flagellar biosynthesis protein FliQ / Flagellar biosynthesis protein FliR / Flagellar transport protein FliP / Flagellar hook protein FlgE superfamily / Flagellar hook protein FlgE ...Flagellar basal-body rod protein FlgC / Flagellar basal-body rod FlgG / Flagellar hook-basal body complex protein FliE / Flagellar basal-body rod protein FlgB / Flagellar hook-basal body complex protein FliE / Flagellar biosynthesis protein FliQ / Flagellar biosynthesis protein FliR / Flagellar transport protein FliP / Flagellar hook protein FlgE superfamily / Flagellar hook protein FlgE / Flagellar basal body protein FlaE D2 domain / Type III secretion system inner membrane R protein / Bacterial export protein family 3 / Flagellar hook-basal body protein, FlgE/F/G / Flagellar hook-basal body protein, FlgE/F/G-like / : / Bacterial export proteins, family 1 / Bacterial export proteins, family 3 / Flagellar hook protein FlgE/F/G D1 domain / Flagella transport protein fliP family signature 1. / Type III secretion system inner membrane P protein / FliP family / Flagella transport protein fliP family signature 2. / Flagellar basal body rod protein, conserved site / Flagella basal body rod proteins signature. / Flagellar basal body rod protein, N-terminal / Flagellar basal-body/hook protein, C-terminal domain / Flagella basal body rod protein / Flagellar basal body rod FlgEFG protein C-terminal / 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 / AMP-binding enzyme, C-terminal domain superfamily
Similarity search - Domain/homology
Flagellar basal-body rod protein FlgC / Flagellar hook protein FlgE / Flagellar basal-body rod protein FlgG / Flagellar biosynthetic protein FliQ / Flagellar M-ring protein / Flagellar basal-body rod protein FlgF / Flagellar basal body rod protein FlgB / Flagellar hook-basal body complex protein FliE / Flagellar biosynthetic protein FliP / Flagellar biosynthetic protein FliR
Similarity search - Component
Biological speciesSalmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsTan, J.X. / Zhang, L. / Zhou, Y. / Zhu, Y.Q.
Funding support China, 3items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81925024 China
National Natural Science Foundation of China (NSFC)U23A20163 China
Ministry of Science and Technology (MoST, China)2017YFA0503900 China
CitationJournal: Cell Res / Year: 2024
Title: Structural basis of the bacterial flagellar motor rotational switching.
Authors: Jiaxing Tan / Ling Zhang / Xingtong Zhou / Siyu Han / Yan Zhou / Yongqun Zhu /
Abstract: The bacterial flagellar motor is a huge bidirectional rotary nanomachine that drives rotation of the flagellum for bacterial motility. The cytoplasmic C ring of the flagellar motor functions as the ...The bacterial flagellar motor is a huge bidirectional rotary nanomachine that drives rotation of the flagellum for bacterial motility. The cytoplasmic C ring of the flagellar motor functions as the switch complex for the rotational direction switching from counterclockwise to clockwise. However, the structural basis of the rotational switching and how the C ring is assembled have long remained elusive. Here, we present two high-resolution cryo-electron microscopy structures of the C ring-containing flagellar basal body-hook complex from Salmonella Typhimurium, which are in the default counterclockwise state and in a constitutively active CheY mutant-induced clockwise state, respectively. In both complexes, the C ring consists of four subrings, but is in two different conformations. The CheY proteins are bound into an open groove between two adjacent protomers on the surface of the middle subring of the C ring and interact with the FliG and FliM subunits. The binding of the CheY protein induces a significant upward shift of the C ring towards the MS ring and inward movements of its protomers towards the motor center, which eventually remodels the structures of the FliG subunits and reverses the orientations and surface electrostatic potential of the α helices to trigger the counterclockwise-to-clockwise rotational switching. The conformational changes of the FliG subunits reveal that the stator units on the motor require a relocation process in the inner membrane during the rotational switching. This study provides unprecedented molecular insights into the rotational switching mechanism and a detailed overall structural view of the bacterial flagellar motors.
History
DepositionSep 30, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Sep 4, 2024Provider: repository / Type: Initial release
Revision 1.1Mar 26, 2025Group: Data collection / Database references / Structure summary
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_entry_details
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
0: Flagellar basal-body rod protein FlgG
1: Flagellar basal-body rod protein FlgG
2: Flagellar basal-body rod protein FlgG
3: Flagellar basal-body rod protein FlgG
4: Flagellar basal-body rod protein FlgG
5: Flagellar basal-body rod protein FlgG
6: Flagellar basal-body rod protein FlgG
7: Flagellar basal-body rod protein FlgG
8: Flagellar basal-body rod protein FlgG
9: Flagellar basal-body rod protein FlgG
ZA: Flagellar basal-body rod protein FlgG
ZB: Flagellar basal-body rod protein FlgG
ZC: Flagellar basal-body rod protein FlgG
ZD: Flagellar basal-body rod protein FlgG
ZE: Flagellar basal-body rod protein FlgG
ZF: Flagellar hook protein FlgE
ZG: Flagellar hook protein FlgE
ZH: Flagellar hook protein FlgE
ZI: Flagellar hook protein FlgE
ZJ: Flagellar hook protein FlgE
ZK: Flagellar hook protein FlgE
ZL: Flagellar hook protein FlgE
ZM: Flagellar hook protein FlgE
ZN: Flagellar hook protein FlgE
ZO: Flagellar hook protein FlgE
ZP: Flagellar hook protein FlgE
ZQ: Flagellar hook protein FlgE
ZR: Flagellar hook protein FlgE
ZS: Flagellar hook protein FlgE
ZT: Flagellar hook protein FlgE
ZU: Flagellar hook protein FlgE
ZV: Flagellar hook protein FlgE
ZW: Flagellar hook protein FlgE
ZX: Flagellar hook protein FlgE
ZY: Flagellar hook protein FlgE
ZZ: Flagellar hook protein FlgE
Za: Flagellar hook protein FlgE
Zb: Flagellar hook protein FlgE
Zc: Flagellar hook protein FlgE
Zd: Flagellar hook protein FlgE
Ze: Flagellar hook protein FlgE
Zf: Flagellar hook protein FlgE
Zg: Flagellar hook protein FlgE
Zh: Flagellar hook protein FlgE
r: Flagellar basal-body rod protein FlgG
s: Flagellar basal-body rod protein FlgG
t: Flagellar basal-body rod protein FlgG
u: Flagellar basal-body rod protein FlgG
v: Flagellar basal-body rod protein FlgG
w: Flagellar basal-body rod protein FlgG
x: Flagellar basal-body rod protein FlgG
y: Flagellar basal-body rod protein FlgG
z: Flagellar basal-body rod protein FlgG
A: Flagellar biosynthetic protein FliQ
B: Flagellar biosynthetic protein FliQ
C: Flagellar biosynthetic protein FliQ
D: Flagellar biosynthetic protein FliQ
E: Flagellar biosynthetic protein FliR
F: Flagellar biosynthetic protein FliP
G: Flagellar biosynthetic protein FliP
H: Flagellar biosynthetic protein FliP
I: Flagellar biosynthetic protein FliP
J: Flagellar biosynthetic protein FliP
K: Flagellar hook-basal body complex protein FliE
L: Flagellar hook-basal body complex protein FliE
M: Flagellar hook-basal body complex protein FliE
N: Flagellar hook-basal body complex protein FliE
O: Flagellar hook-basal body complex protein FliE
P: Flagellar hook-basal body complex protein FliE
Q: Flagellar basal body rod protein FlgB
R: Flagellar basal body rod protein FlgB
S: Flagellar basal body rod protein FlgB
T: Flagellar basal body rod protein FlgB
U: Flagellar basal body rod protein FlgB
V: Flagellar basal-body rod protein FlgC
W: Flagellar basal-body rod protein FlgC
X: Flagellar basal-body rod protein FlgC
Y: Flagellar basal-body rod protein FlgC
Z: Flagellar basal-body rod protein FlgC
a: Flagellar basal-body rod protein FlgC
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 basal-body rod protein FlgF
n: Flagellar basal-body rod protein FlgF
o: Flagellar basal-body rod protein FlgF
p: Flagellar basal-body rod protein FlgF
q: Flagellar basal-body rod protein FlgF


Theoretical massNumber of molelcules
Total (without water)3,124,02996
Polymers3,124,02996
Non-polymers00
Water00
1


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

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Components

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Flagellar basal-body rod protein ... , 3 types, 35 molecules 0123456789ZAZBZCZDZErstuvwxyzVWXYZa...

#1: Protein ...
Flagellar basal-body rod protein FlgG / Distal rod protein


Mass: 27784.807 Da / Num. of mol.: 24 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P0A1J3
#8: Protein
Flagellar basal-body rod protein FlgC / Putative proximal rod protein


Mass: 13991.889 Da / Num. of mol.: 6 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P0A1I7
#10: Protein
Flagellar basal-body rod protein FlgF / Putative proximal rod protein


Mass: 26121.223 Da / Num. of mol.: 5 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P16323

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Protein , 4 types, 51 molecules ZFZGZHZIZJZKZLZMZNZOZPZQZRZSZTZUZVZWZXZYZZZaZbZcZdZeZfZgZhK...

#2: Protein ...
Flagellar hook protein FlgE


Mass: 42233.152 Da / Num. of mol.: 29 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P0A1J1
#6: Protein
Flagellar hook-basal body complex protein FliE


Mass: 11087.662 Da / Num. of mol.: 6 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P26462
#7: Protein
Flagellar basal body rod protein FlgB / Putative proximal rod protein


Mass: 15145.061 Da / Num. of mol.: 5 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P16437
#9: Protein
Flagellar M-ring protein


Mass: 61295.645 Da / Num. of mol.: 11 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P15928

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Flagellar biosynthetic protein ... , 3 types, 10 molecules ABCDEFGHIJ

#3: Protein
Flagellar biosynthetic protein FliQ


Mass: 9606.758 Da / Num. of mol.: 4 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P0A1L5
#4: Protein Flagellar biosynthetic protein FliR


Mass: 28938.865 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P54702
#5: Protein
Flagellar biosynthetic protein FliP


Mass: 26801.086 Da / Num. of mol.: 5 / Source method: isolated from a natural source
Source: (natural) Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
References: UniProt: P54700

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Details

Has protein modificationN

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: C ring-containing flagellar motor-hook complex in the CCW state
Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 (bacteria)
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMtris(hydroxymethyl)aminomethane hydrochlorideTris-HCl1
25 mMethylenediaminetetraacetic acidEDTA1
30.1 % v/voctylphenol ethoxylateTX-1001
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K
Details: Blot time: 2 Blot force: -15 Wait time: 60 Blot total: 1

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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 FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm
Image recordingElectron dose: 45 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.1.1particle selection
2SerialEMimage acquisition
4cryoSPARC4.1.1CTF correction
7UCSF Chimera1.17model fitting
8UCSF ChimeraX1.5model fitting
9Coot0.9.8.7model fitting
11cryoSPARC4.1.1initial Euler assignment
12cryoSPARC4.1.1final Euler assignment
14cryoSPARC4.1.13D reconstruction
15PHENIX1.20.1_4487:model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 22192 / Details: Particles were manually picked using cryoSPARC
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 11858 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingDetails: Model-Angelo / Source name: Other / Type: in silico model

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