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Open data
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Basic information
Entry | Database: PDB / ID: 8c4c | ||||||
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Title | F-actin decorated by SipA497-669 | ||||||
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![]() | CELL INVASION / Salmonella invasion | ||||||
Function / homology | ![]() Striated Muscle Contraction / skeletal muscle thin filament assembly / striated muscle thin filament / skeletal muscle fiber development / stress fiber / actin filament / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / actin binding / hydrolase activity / extracellular region / ATP binding Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 2.7 Å | ||||||
![]() | Yuan, B. / Wald, J. / Marlovits, T.C. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for subversion of host cell actin cytoskeleton during infection. Authors: Biao Yuan / Jonas Scholz / Jiri Wald / Roland Thuenauer / Rory Hennell James / Irina Ellenberg / Sabine Windhorst / Jan Faix / Thomas C Marlovits / ![]() Abstract: Secreted bacterial type III secretion system (T3SS) proteins are essential for successful infection by many human pathogens. Both T3SS translocator SipC and effector SipA are critical for infection ...Secreted bacterial type III secretion system (T3SS) proteins are essential for successful infection by many human pathogens. Both T3SS translocator SipC and effector SipA are critical for infection by subversion of the host cell cytoskeleton, but the precise molecular interplay between them remains unknown. Here, using cryo-electron microscopy, we show that SipA binds along the F-actin grooves with a unique binding pattern. SipA stabilizes F-actin through charged interface residues and appears to prevent inorganic phosphate release through closure of the "back door" of adenosine 5'-triphosphate pocket. We also show that SipC enhances the binding of SipA to F-actin, thus demonstrating that a sequential presence of T3SS proteins in host cells is associated with a sequence of infection events-starting with actin nucleation, filament growth, and stabilization. Together, our data explain the coordinated interplay of a precisely tuned and highly effective mechanism during infection and provide a blueprint for interfering with effectors acting on actin. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.6 MB | Display | ![]() |
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PDB format | ![]() | 1.1 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.6 MB | Display | ![]() |
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Full document | ![]() | 1.6 MB | Display | |
Data in XML | ![]() | 104.7 KB | Display | |
Data in CIF | ![]() | 161 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 16424MC ![]() 8c4eC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 42109.973 Da / Num. of mol.: 8 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() References: UniProt: P68139, Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement #2: Protein | Mass: 19143.604 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: LT2 / Gene: sipA, sspA / Production host: ![]() ![]() #3: Chemical | ChemComp-ADP / #4: Chemical | ChemComp-PO4 / #5: Chemical | ChemComp-MG / Has ligand of interest | Y | |
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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
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Source (natural) |
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Source (recombinant) | Organism: ![]() ![]() | ||||||||||||||||||||||||
Buffer solution | pH: 8 Details: 5 mM Tris buffer, pH 7.5, 0.1 mM DTT, 0.2 mM ATP, 0.2 mM EGTA and 0.05 mM MgCl2 | ||||||||||||||||||||||||
Specimen | Conc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277.15 K |
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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 / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm |
Image recording | Average exposure time: 3 sec. / Electron dose: 70 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software | Name: RELION / Version: 3.1 / Category: 3D reconstruction | ||||||||||||||||||||||||
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CTF correction | Type: NONE | ||||||||||||||||||||||||
Helical symmerty |
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3D reconstruction | Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 130720 / Algorithm: FOURIER SPACE / Symmetry type: HELICAL | ||||||||||||||||||||||||
Atomic model building | Protocol: OTHER | ||||||||||||||||||||||||
Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
Displacement parameters | Biso mean: 63.3 Å2 | ||||||||||||||||||||||||
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