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- PDB-7jm3: Full-length three-dimensional structure of the influenza A virus ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7jm3 | ||||||||||||
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Title | Full-length three-dimensional structure of the influenza A virus M1 protein and its organization into a matrix layer | ||||||||||||
![]() | Matrix protein 1 | ||||||||||||
![]() | VIRAL PROTEIN / influenza A / virus / matrix layer / M1 protein | ||||||||||||
Function / homology | ![]() Assembly of Viral Components at the Budding Site / Influenza Infection / Fusion of the Influenza Virion to the Host Cell Endosome / Release / Budding / Packaging of Eight RNA Segments / Uncoating of the Influenza Virion / Entry of Influenza Virion into Host Cell via Endocytosis / Viral RNP Complexes in the Host Cell Nucleus / NEP/NS2 Interacts with the Cellular Export Machinery ...Assembly of Viral Components at the Budding Site / Influenza Infection / Fusion of the Influenza Virion to the Host Cell Endosome / Release / Budding / Packaging of Eight RNA Segments / Uncoating of the Influenza Virion / Entry of Influenza Virion into Host Cell via Endocytosis / Viral RNP Complexes in the Host Cell Nucleus / NEP/NS2 Interacts with the Cellular Export Machinery / Viral mRNA Translation / viral budding from plasma membrane / structural constituent of virion / host cell nucleus / virion membrane / RNA binding / extracellular region / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.4 Å | ||||||||||||
![]() | Su, Z. / Pintilie, G. / Selzer, L. / Chiu, W. / Kirkegaard, K. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Full-length three-dimensional structure of the influenza A virus M1 protein and its organization into a matrix layer. Authors: Lisa Selzer / Zhaoming Su / Grigore D Pintilie / Wah Chiu / Karla Kirkegaard / ![]() ![]() Abstract: Matrix proteins are encoded by many enveloped viruses, including influenza viruses, herpes viruses, and coronaviruses. Underneath the viral envelope of influenza virus, matrix protein 1 (M1) forms an ...Matrix proteins are encoded by many enveloped viruses, including influenza viruses, herpes viruses, and coronaviruses. Underneath the viral envelope of influenza virus, matrix protein 1 (M1) forms an oligomeric layer critical for particle stability and pH-dependent RNA genome release. However, high-resolution structures of full-length monomeric M1 and the matrix layer have not been available, impeding antiviral targeting and understanding of the pH-dependent transitions involved in cell entry. Here, purification and extensive mutagenesis revealed protein-protein interfaces required for the formation of multilayered helical M1 oligomers similar to those observed in virions exposed to the low pH of cell entry. However, single-layered helical oligomers with biochemical and ultrastructural similarity to those found in infectious virions before cell entry were observed upon mutation of a single amino acid. The highly ordered structure of the single-layered oligomers and their likeness to the matrix layer of intact virions prompted structural analysis by cryo-electron microscopy (cryo-EM). The resulting 3.4-Å-resolution structure revealed the molecular details of M1 folding and its organization within the single-shelled matrix. The solution of the full-length M1 structure, the identification of critical assembly interfaces, and the development of M1 assembly assays with purified proteins are crucial advances for antiviral targeting of influenza viruses. #1: ![]() Title: Full-length three-dimensional structure of the influenza A virus M1 protein and its organization into a matrix layer Authors: Selzer, L. / Su, Z. / Pintilie, G. / Chiu, W. / Kirkegaard, K. | ||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 93.5 KB | Display | ![]() |
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PDB format | ![]() | 72.4 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 869.6 KB | Display | ![]() |
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Full document | ![]() | 870.9 KB | Display | |
Data in XML | ![]() | 16 KB | Display | |
Data in CIF | ![]() | 21.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22384MC 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: 60 / Rise per n subunits: 1.96 Å / Rotation per n subunits: 17.1 °) |
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Components
#1: Protein | Mass: 27827.152 Da / Num. of mol.: 1 / Mutation: V97K Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: A/Puerto Rico/8/1934 H1N1 / Gene: M1, M / Production host: ![]() ![]() |
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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: M1-V97K oligomer / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT | |||||||||||||||
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Molecular weight | Value: 143 kDa/nm / Experimental value: NO | |||||||||||||||
Source (natural) | Organism: ![]() | |||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | |||||||||||||||
Details of virus | Empty: NO / Enveloped: YES / Isolate: STRAIN / Type: VIRION | |||||||||||||||
Buffer solution | pH: 7 | |||||||||||||||
Buffer component |
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Specimen | Conc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES Details: Influenza A virus matrix protein with V97K mutation assembled in vitro | |||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3 | |||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: Blot for 3 seconds once 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 |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 165000 X / Calibrated defocus min: 300 nm / Calibrated defocus max: 4300 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: BASIC |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 78 K / Temperature (min): 78 K |
Image recording | Average exposure time: 4 sec. / Electron dose: 36 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 440 |
EM imaging optics | Energyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV |
Image scans | Width: 3838 / Height: 3710 / Movie frames/image: 20 / Used frames/image: 1-20 |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||
Helical symmerty | Angular rotation/subunit: 17.1 ° / Axial rise/subunit: 1.96 Å / Axial symmetry: C1 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 2268 | ||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 56602 / Algorithm: FOURIER SPACE / Num. of class averages: 200 / Symmetry type: HELICAL | ||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: AB INITIO MODEL / Space: REAL / Target criteria: Correlation coefficient | ||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 1EA3 Accession code: 1EA3 / Source name: PDB / Type: experimental model |