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- PDB-7ocw: Hepatitis B core protein -low secretion phenotype P5T -

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Basic information

Entry
Database: PDB / ID: 7ocw
TitleHepatitis B core protein -low secretion phenotype P5T
ComponentsCapsid proteinCapsid
KeywordsVIRUS LIKE PARTICLE / low secretion phenotype / P5T / Hepatitis B core protein
Function / homology
Function and homology information


virus-mediated perturbation of host defense response => GO:0019049 / microtubule-dependent intracellular transport of viral material towards nucleus / T=4 icosahedral viral capsid / : / viral penetration into host nucleus / host cell cytoplasm / symbiont entry into host cell / structural molecule activity / DNA binding / RNA binding / extracellular region
Similarity search - Function
Hepatitis B virus, capsid N-terminal / Hepatitis core protein, putative zinc finger / Hepatitis core antigen / Viral capsid core domain supefamily, Hepatitis B virus / Hepatitis core antigen
Similarity search - Domain/homology
Biological speciesHepatitis B virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsBottcher, B. / Makbul, C.
Funding support Germany, 1items
OrganizationGrant numberCountry
German Research Foundation (DFG)bo1150/17-1 Germany
CitationJournal: Microorganisms / Year: 2021
Title: Conformational Plasticity of Hepatitis B Core Protein Spikes Promotes Peptide Binding Independent of the Secretion Phenotype.
Authors: Cihan Makbul / Vladimir Khayenko / Hans Michael Maric / Bettina Böttcher /
Abstract: Hepatitis B virus is a major human pathogen, which forms enveloped virus particles. During viral maturation, membrane-bound hepatitis B surface proteins package hepatitis B core protein capsids. This ...Hepatitis B virus is a major human pathogen, which forms enveloped virus particles. During viral maturation, membrane-bound hepatitis B surface proteins package hepatitis B core protein capsids. This process is intercepted by certain peptides with an "LLGRMKG" motif that binds to the capsids at the tips of dimeric spikes. With microcalorimetry, electron cryo microscopy and peptide microarray-based screens, we have characterized the structural and thermodynamic properties of peptide binding to hepatitis B core protein capsids with different secretion phenotypes. The peptide "GSLLGRMKGA" binds weakly to hepatitis B core protein capsids and mutant capsids with a premature (F97L) or low-secretion phenotype (L60V and P5T). With electron cryo microscopy, we provide novel structures for L60V and P5T and demonstrate that binding occurs at the tips of the spikes at the dimer interface, splaying the helices apart independent of the secretion phenotype. Peptide array screening identifies "SLLGRM" as the core binding motif. This shortened motif binds only to one of the two spikes in the asymmetric unit of the capsid and induces a much smaller conformational change. Altogether, these comprehensive studies suggest that the tips of the spikes act as an autonomous binding platform that is unaffected by mutations that affect secretion phenotypes.
History
DepositionApr 28, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 26, 2021Provider: repository / Type: Initial release

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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
B: Capsid protein
A: Capsid protein
C: Capsid protein
D: Capsid protein


Theoretical massNumber of molelcules
Total (without water)84,6014
Polymers84,6014
Non-polymers00
Water0
1
B: Capsid protein
A: Capsid protein
C: Capsid protein
D: Capsid protein
x 60


Theoretical massNumber of molelcules
Total (without water)5,076,049240
Polymers5,076,049240
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation59
MethodUCSF CHIMERA

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Components

#1: Protein
Capsid protein / Capsid / Core antigen / Core protein / HBcAg / p21.5


Mass: 21150.205 Da / Num. of mol.: 4 / Mutation: P5T
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Hepatitis B virus / Production host: Escherichia coli (E. coli) / References: UniProt: A0A0U2YCX5

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Hepatitis B virus / Type: VIRUS / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 4.8 MDa / Experimental value: NO
Source (natural)Organism: Hepatitis B virus / Strain: genotype D subtype ayw
Source (recombinant)Organism: Escherichia coli (E. coli)
Details of virusEmpty: NO / Enveloped: NO / Isolate: STRAIN / Type: VIRUS-LIKE PARTICLE
Natural hostOrganism: Homo sapiens
Virus shellName: capsid / Diameter: 360 nm / Triangulation number (T number): 4
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 75000 X / Nominal defocus max: 1400 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 2.5 sec. / Electron dose: 40 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2421

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Processing

SoftwareName: PHENIX / Version: 1.16_3549: / Classification: refinement
EM software
IDNameVersionCategoryDetails
1crYOLOparticle selection
2RELION3.1particle selectiontemplate
3EPUimage acquisition
5CTFFIND4CTF correction
8PHENIXmodel fitting
9UCSF Chimeramodel fitting
10Cootmodel fitting
12RELION3.1initial Euler assignment
13RELION3.1final Euler assignment
15RELION3.13D reconstruction
16PHENIXmodel refinement
17Cootmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 169111
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 61896 / Symmetry type: POINT
Atomic model buildingB value: 139 / Protocol: FLEXIBLE FIT / Space: REAL
Atomic model building
IDPDB-IDPdb chain-ID 3D fitting-ID
16HTX

6htx

c1
26HTX

6htx

A1
36HTX

6htx

B1
46HTX

6htx

D1
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0064882
ELECTRON MICROSCOPYf_angle_d0.6276683
ELECTRON MICROSCOPYf_dihedral_angle_d8.8233158
ELECTRON MICROSCOPYf_chiral_restr0.042765
ELECTRON MICROSCOPYf_plane_restr0.004844

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