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- PDB-9fx0: Cryo-EM structure of the type 1 pilus tip-to-rod transition -

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Basic information

Entry
Database: PDB / ID: 9fx0
TitleCryo-EM structure of the type 1 pilus tip-to-rod transition
Components
  • Protein FimF
  • Type-1 fimbrial protein, A chain
KeywordsCELL ADHESION / rod / tip / usher / pilus
Function / homology
Function and homology information


pilus assembly / pilus tip / mechanosensory behavior / cell adhesion involved in single-species biofilm formation / pilus / cell-substrate adhesion / cell adhesion / identical protein binding
Similarity search - Function
Fimbrial-type adhesion domain / Fimbrial protein / : / Fimbrial-type adhesion domain superfamily / Adhesion domain superfamily
Similarity search - Domain/homology
Type-1 fimbrial protein, A chain / Protein FimF
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsBachmann, P. / Afanasyev, P. / Boehringer, D. / Glockshuber, R.
Funding support Switzerland, 1items
OrganizationGrant numberCountry
Swiss National Science Foundation310030_201234 Switzerland
CitationJournal: To Be Published
Title: Cryo-EM structure of the type 1 pilus tip-to-rod transition
Authors: Bachmann, P. / Afanasyev, P. / Boehringer, D. / Glockshuber, R.
History
DepositionJul 1, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 4, 2025Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jun 4, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Type-1 fimbrial protein, A chain
B: Type-1 fimbrial protein, A chain
C: Type-1 fimbrial protein, A chain
D: Type-1 fimbrial protein, A chain
E: Type-1 fimbrial protein, A chain
F: Protein FimF
G: Type-1 fimbrial protein, A chain


Theoretical massNumber of molelcules
Total (without water)111,9767
Polymers111,9767
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein
Type-1 fimbrial protein, A chain / Type-1A pilin


Mass: 15966.440 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: fimA, pilA, b4314, JW4277 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P04128
#2: Protein Protein FimF


Mass: 16177.095 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: fimF, b4318, JW4281 / Production host: Escherichia coli (E. coli) / Strain (production host): HM125 / References: UniProt: P08189
Has protein modificationY

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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: FimDHGFAnC / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21(DE3) and HM125
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K

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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: 130000 X / Nominal defocus max: 2800 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1.1 sec. / Electron dose: 64 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameVersionCategory
2PHENIX1.21.1_5286model refinement
5cryoSPARCCTF correction
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 127989 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 37.31 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00277764
ELECTRON MICROSCOPYf_angle_d0.469710614
ELECTRON MICROSCOPYf_chiral_restr0.04061322
ELECTRON MICROSCOPYf_plane_restr0.00361421
ELECTRON MICROSCOPYf_dihedral_angle_d3.75471116

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