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- EMDB-5535: Visualization of Bacteriophage T7 Infection by Cryo-Electron Tomo... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-5535 | |||||||||
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Title | Visualization of Bacteriophage T7 Infection by Cryo-Electron Tomography | |||||||||
![]() | Asymmetric reconstruction of bacteriophage infecting E. coli | |||||||||
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![]() | Bacteriophage infection E. coli minicell DNA ejection | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | subtomogram averaging / cryo EM / Resolution: 40.0 Å | |||||||||
![]() | Hu B / Margolin W / Molineux IJ / Liu J | |||||||||
![]() | ![]() Title: The bacteriophage t7 virion undergoes extensive structural remodeling during infection. Authors: Bo Hu / William Margolin / Ian J Molineux / Jun Liu / ![]() Abstract: Adsorption and genome ejection are fundamental to the bacteriophage life cycle, yet their molecular mechanisms are not well understood. We used cryo-electron tomography to capture T7 virions at ...Adsorption and genome ejection are fundamental to the bacteriophage life cycle, yet their molecular mechanisms are not well understood. We used cryo-electron tomography to capture T7 virions at successive stages of infection of Escherichia coli minicells at ~4-nm resolution. The six phage tail fibers were folded against the capsid, extending and orienting symmetrically only after productive adsorption to the host cell surface. Receptor binding by the tail triggered conformational changes resulting in the insertion of an extended tail, which functions as the DNA ejection conduit into the cell cytoplasm. After ejection, the extended phage tail collapsed or disassembled, which allowed resealing of the infected cell membrane. These structural studies provide a detailed series of intermediates during phage infection. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 16.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.7 KB 10.7 KB | Display Display | ![]() |
Images | ![]() | 331.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 77.8 KB | Display | ![]() |
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Full document | ![]() | 76.9 KB | Display | |
Data in XML | ![]() | 493 B | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Asymmetric reconstruction of bacteriophage infecting E. coli | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 5.7 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Bacteriophage T7 infecting E. coli cell
Entire | Name: Bacteriophage T7 infecting E. coli cell |
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Components |
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-Supramolecule #1000: Bacteriophage T7 infecting E. coli cell
Supramolecule | Name: Bacteriophage T7 infecting E. coli cell / type: sample / ID: 1000 / Number unique components: 2 |
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-Supramolecule #1: Enterobacteria phage T7
Supramolecule | Name: Enterobacteria phage T7 / type: virus / ID: 1 / Name.synonym: Bacteriophage T7 / NCBI-ID: 10760 / Sci species name: Enterobacteria phage T7 / Database: NCBI / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No / Syn species name: Bacteriophage T7 |
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Host (natural) | Organism: ![]() ![]() |
Virus shell | Shell ID: 1 / Name: capsid / Diameter: 600 Å |
-Supramolecule #2: Bacteriophage infection
Supramolecule | Name: Bacteriophage infection / type: organelle_or_cellular_component / ID: 2 / Recombinant expression: No / Database: NCBI |
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Source (natural) | Organism: ![]() ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | subtomogram averaging |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.8 / Details: 50 mM Tris-HCl, 10 mM MgCl2, 0.1 M NaCl |
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Grid | Details: 200 mesh grid |
Vitrification | Cryogen name: ETHANE / Chamber temperature: 100 K / Instrument: HOMEMADE PLUNGER / Method: Blot for 3 seconds before plunging. |
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Electron microscopy
Microscope | FEI POLARA 300 |
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Temperature | Min: 90 K / Max: 100 K / Average: 95 K |
Alignment procedure | Legacy - Astigmatism: Objective lens astigmatism was corrected at 200,000x magnification |
Date | Mar 16, 2011 |
Image recording | Category: CCD / Film or detector model: GENERIC TVIPS (4k x 4k) / Average electron dose: 100 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 6.0 µm / Nominal defocus min: 4.0 µm / Nominal magnification: 31000 |
Sample stage | Specimen holder: Liquid Nitrogen cooled / Specimen holder model: GATAN LIQUID NITROGEN / Tilt series - Axis1 - Min angle: -64 ° / Tilt series - Axis1 - Max angle: 64 ° |
Experimental equipment | ![]() Model: Tecnai Polara / Image courtesy: FEI Company |
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Image processing
Details | The particles were manually selected from cryo-tomograms. |
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Final reconstruction | Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 40.0 Å / Resolution method: OTHER / Software - Name: IMOD, Raptor, Protomo / Number subtomograms used: 3352 |
CTF correction | Details: No CTF correction |
Final 3D classification | Number classes: 4 |