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- PDB-3ja7: Cryo-EM structure of the bacteriophage T4 portal protein assembly... -
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Open data
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Basic information
Entry | Database: PDB / ID: 3ja7 | ||||||
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Title | Cryo-EM structure of the bacteriophage T4 portal protein assembly at near-atomic resolution | ||||||
![]() | Portal protein gp20 | ||||||
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Function / homology | Portal protein Gp20 / Bacteriophage T4-like portal protein (Gp20) / symbiont genome ejection through host cell envelope, contractile tail mechanism / viral portal complex / viral genome packaging / viral release from host cell / host cell plasma membrane / ![]() ![]() | ||||||
Biological species | ![]() ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Sun, L. / Zhang, X. / Gao, S. / Rao, P.A. / Padilla-Sanchez, V. / Chen, Z. / Sun, S. / Xiang, Y. / Subramaniam, S. / Rao, V.B. / Rossmann, M.G. | ||||||
![]() | ![]() Title: Cryo-EM structure of the bacteriophage T4 portal protein assembly at near-atomic resolution. Authors: Lei Sun / Xinzheng Zhang / Song Gao / Prashant A Rao / Victor Padilla-Sanchez / Zhenguo Chen / Siyang Sun / Ye Xiang / Sriram Subramaniam / Venigalla B Rao / Michael G Rossmann / ![]() Abstract: The structure and assembly of bacteriophage T4 has been extensively studied. However, the detailed structure of the portal protein remained unknown. Here we report the structure of the bacteriophage ...The structure and assembly of bacteriophage T4 has been extensively studied. However, the detailed structure of the portal protein remained unknown. Here we report the structure of the bacteriophage T4 portal assembly, gene product 20 (gp20), determined by cryo-electron microscopy (cryo-EM) to 3.6 Å resolution. In addition, analysis of a 10 Å resolution cryo-EM map of an empty prolate T4 head shows how the dodecameric portal assembly interacts with the capsid protein gp23 at the special pentameric vertex. The gp20 structure also verifies that the portal assembly is required for initiating head assembly, for attachment of the packaging motor, and for participation in DNA packaging. Comparison of the Myoviridae T4 portal structure with the known portal structures of φ29, SPP1 and P22, representing Podo- and Siphoviridae, shows that the portal structure probably dates back to a time when self-replicating microorganisms were being established on Earth. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 991.7 KB | Display | ![]() |
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PDB format | ![]() | 828.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 6324MC ![]() 6323C 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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Components
#1: Protein | Mass: 53358.414 Da / Num. of mol.: 12 / Fragment: UNP residues 74-524 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
Component | Name: T4 portal protein gp20 / Type: VIRUS / Details: dodecamer |
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Molecular weight | Value: 0.66 MDa / Experimental value: YES |
Buffer solution | Name: 20 mM Tris-HCl, 400 mM NaCl, 5 mM EDTA / pH: 7.8 / Details: 20 mM Tris-HCl, 400 mM NaCl, 5 mM EDTA |
Specimen | Conc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() |
Specimen support | Details: Quantifoil R1.2/1.3 holey carbon on 200 mesh copper |
Vitrification![]() | Instrument: GATAN CRYOPLUNGE 3 / Cryogen name: ETHANE / Temp: 120 K / Humidity: 90 % Details: Blot for 7 seconds before plunging into liquid ethane (GATAN CRYOPLUNGE 3). Method: Blot for 7 seconds before plunging |
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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 / Date: Jul 10, 2014 |
Electron gun | Electron source![]() ![]() |
Electron lens | Mode: BRIGHT FIELD![]() ![]() |
Specimen holder | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Specimen holder type: Liquid nitrogen-cooled / Temperature: 100 K / Temperature (max): 105 K / Temperature (min): 80 K |
Image recording | Electron dose: 2 e/Å2 / Film or detector model: GATAN K2 (4k x 4k) |
EM imaging optics | Energyfilter name![]() |
Image scans | Num. digital images: 839 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Relative weight: 1 |
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Processing
EM software | Name: RELION / Category: 3D reconstruction![]() | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CTF correction![]() | Details: each particle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry![]() ![]() | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction![]() | Method: Cross-common lines / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 98000 / Nominal pixel size: 1 Å / Actual pixel size: 1 Å Details: FSC was calculated from two independent reconstructions. Particles were selected using an automatic selection program. (Single particle--Applied symmetry: C12) Num. of class averages: 15 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 3.6→3.6 Å / SU ML: 0.48 / σ(F): 0 / Phase error: 28.36 / Stereochemistry target values: ML
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso max: 302.6 Å2 / Biso mean: 83.0196 Å2 / Biso min: 6.59 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 3.63→272 Å
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Refine LS restraints |
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LS refinement shell | Refine-ID: ELECTRON MICROSCOPY / Total num. of bins used: 14
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