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Open data
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Basic information
Entry | Database: PDB / ID: 8ckv | ||||||||||||||||||
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Title | HIV-1 mature capsid hexamer from CA-IP6 CLPs | ||||||||||||||||||
![]() | Gag polyprotein | ||||||||||||||||||
![]() | VIRUS LIKE PARTICLE / Capsid / Hexamer / HIV-1 / Mature | ||||||||||||||||||
Function / homology | ![]() viral process / viral nucleocapsid / host cell cytoplasm / host cell nucleus / structural molecule activity / virion membrane / RNA binding / zinc ion binding / ATP binding / cytoplasm Similarity search - Function | ||||||||||||||||||
Biological species | ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.89 Å | ||||||||||||||||||
![]() | Stacey, J.C.V. / Briggs, J.A.G. | ||||||||||||||||||
Funding support | ![]() ![]() ![]()
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![]() | ![]() Title: Two structural switches in HIV-1 capsid regulate capsid curvature and host factor binding. Authors: James C V Stacey / Aaron Tan / John M Lu / Leo C James / Robert A Dick / John A G Briggs / ![]() ![]() ![]() Abstract: The mature HIV-1 capsid protects the viral genome and interacts with host proteins to travel from the cell periphery into the nucleus. To achieve this, the capsid protein, CA, constructs conical ...The mature HIV-1 capsid protects the viral genome and interacts with host proteins to travel from the cell periphery into the nucleus. To achieve this, the capsid protein, CA, constructs conical capsids from a lattice of hexamers and pentamers, and engages in and then relinquishes multiple interactions with cellular proteins in an orchestrated fashion. Cellular host factors including Nup153, CPSF6, and Sec24C engage the same pocket within CA hexamers. How CA assembles pentamers and hexamers of different curvatures, how CA oligomerization states or curvature might modulate host-protein interactions, and how binding of multiple cofactors to a single site is coordinated, all remain to be elucidated. Here, using single-particle cryoEM, we have determined the structure of the mature HIV-1 CA pentamer and hexamer from conical CA-IP polyhedra to ~3 Å resolution. We also determined structures of hexamers in the context of multiple lattice curvatures and number of pentamer contacts. Comparison of these structures, bound or not to host protein peptides, revealed two structural switches within HIV-1 CA that modulate peptide binding according to CA lattice curvature and whether CA is hexameric or pentameric. These observations suggest that the conical HIV-1 capsid has different host-protein binding properties at different positions on its surface, which may facilitate cell entry and represent an evolutionary advantage of conical morphology. | ||||||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 51.6 KB | Display | ![]() |
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PDB format | ![]() | 34.2 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 16703MC ![]() 8ckwC ![]() 8ckxC ![]() 8ckyC ![]() 8ckzC ![]() 8cl0C ![]() 8cl1C ![]() 8cl2C ![]() 8cl3C ![]() 8cl4C 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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1 | ![]()
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Components
#1: Protein | Mass: 25761.623 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: HIV-1 Mature Capsid / Type: COMPLEX / Details: Hexamer / Entity ID: all / Source: RECOMBINANT | |||||||||||||||||||||||||
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Molecular weight | Value: 0.026 MDa / Experimental value: NO | |||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Buffer solution | pH: 6.1 | |||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: VLP assembly. | |||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: C-flat-2/2 | |||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 291 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 magnification: 130000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: ZEMLIN TABLEAU |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 27252 |
EM imaging optics | Energyfilter name: TFS Selectris / Energyfilter slit width: 20 eV |
Image scans | Sampling size: 14 µm / Width: 4096 / Height: 4096 |
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Processing
Software | Name: PHENIX / Version: 1.17.1_3660: / Classification: refinement | ||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 8718298 | ||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C6 (6 fold cyclic) | ||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.89 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 4742639 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Space: REAL / Target criteria: Cross-correlation / Details: Initial model:4XFX | ||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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