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- PDB-7khw: Cryo-EM structure of enteropathogenic Escherichia coli type III s... -
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Basic information
Entry | Database: PDB / ID: 7khw | ||||||
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Title | Cryo-EM structure of enteropathogenic Escherichia coli type III secretion system EspA filament | ||||||
![]() | Translocon EspA | ||||||
![]() | PROTEIN FIBRIL / type III secretion system (T3SS) / EspA filament / Helical reconstruction | ||||||
Function / homology | EspA-like secreted protein / EspA-like secreted protein / EspA/CesA-like / Translocon EspA![]() | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.4 Å | ||||||
![]() | Zheng, W. / Ilangovan, A. / Costa, T.R.D. / Egelman, E.H. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Cryoelectron-microscopy structure of the enteropathogenic type III secretion system EspA filament. Authors: Weili Zheng / Alejandro Peña / Aravindan Ilangovan / Yasaman Naemi Baghshomali / Gad Frankel / Edward H Egelman / Tiago R D Costa / ![]() ![]() Abstract: Enteropathogenic (EPEC) and enterohemorrhagic (EHEC) utilize a macromolecular type III secretion system (T3SS) to inject effector proteins into eukaryotic cells. This apparatus spans the inner and ...Enteropathogenic (EPEC) and enterohemorrhagic (EHEC) utilize a macromolecular type III secretion system (T3SS) to inject effector proteins into eukaryotic cells. This apparatus spans the inner and outer bacterial membranes and includes a helical needle protruding into the extracellular space. Thus far observed only in EPEC and EHEC and not found in other pathogenic Gram-negative bacteria that have a T3SS is an additional helical filament made by the EspA protein that forms a long extension to the needle, mediating both attachment to eukaryotic cells and transport of effector proteins through the intestinal mucus layer. Here, we present the structure of the EspA filament from EPEC at 3.4 Å resolution. The structure reveals that the EspA filament is a right-handed 1-start helical assembly with a conserved lumen architecture with respect to the needle to ensure the seamless transport of unfolded cargos en route to the target cell. This functional conservation is despite the fact that there is little apparent overall conservation at the level of sequence or structure with the needle. We also unveil the molecular details of the immunodominant EspA epitope that can now be exploited for the rational design of epitope display systems. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 1.3 MB | Display | ![]() |
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PDB format | ![]() | 1.1 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 183.4 KB | Display | |
Data in CIF | ![]() | 250.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22881MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Symmetry | Helical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 50 / Rise per n subunits: 4.4 Å / Rotation per n subunits: 64.3 °) |
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Components
#1: Protein | Mass: 20482.811 Da / Num. of mol.: 50 / Source method: isolated from a natural source Source: (natural) ![]() ![]() Strain: E2348/69 / EPEC / References: UniProt: B7UM94 |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: FILAMENT / 3D reconstruction method: helical reconstruction |
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Sample preparation
Component | Name: EspA filament / Type: COMPLEX / Entity ID: all / Source: NATURAL |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() Strain: E2348/69 / EPEC |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Specimen holder | Cryogen: NITROGEN |
Image recording | Electron dose: 55 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
Helical symmerty | Angular rotation/subunit: 64.3 ° / Axial rise/subunit: 4.4 Å / Axial symmetry: C1 | ||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 159460 / Symmetry type: HELICAL |