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- PDB-6wfs: Cryo-EM Structure of Hepatitis B virus T=4 capsid in complex with... -

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Basic information

Entry
Database: PDB / ID: 6wfs
TitleCryo-EM Structure of Hepatitis B virus T=4 capsid in complex with the antiviral molecule DBT1
ComponentsCapsid protein
KeywordsVIRUS LIKE PARTICLE / capsid / antiviral / HBV
Function / homology
Function and homology information


microtubule-dependent intracellular transport of viral material towards nucleus / T=4 icosahedral viral capsid / viral penetration into host nucleus / host cell / host cell cytoplasm / symbiont entry into host cell / structural molecule activity / DNA binding / RNA binding / identical protein binding
Similarity search - Function
Hepatitis core antigen / Viral capsid core domain supefamily, Hepatitis B virus / Hepatitis core antigen
Similarity search - Domain/homology
Chem-U0A / Capsid protein
Similarity search - Component
Biological speciesHepatitis B virus genotype D subtype adw
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.6 Å
AuthorsSchlicksup, C. / Laughlin, P. / Dunkelbarger, S. / Wang, J.C. / Zlotnick, A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI067417 United States
CitationJournal: ACS Chem Biol / Year: 2020
Title: Local Stabilization of Subunit-Subunit Contacts Causes Global Destabilization of Hepatitis B Virus Capsids.
Authors: Christopher John Schlicksup / Patrick Laughlin / Steven Dunkelbarger / Joseph Che-Yen Wang / Adam Zlotnick /
Abstract: Development of antiviral molecules that bind virion is a strategy that remains in its infancy, and the details of their mechanisms are poorly understood. Here we investigate the behavior of DBT1, a ...Development of antiviral molecules that bind virion is a strategy that remains in its infancy, and the details of their mechanisms are poorly understood. Here we investigate the behavior of DBT1, a dibenzothiazepine that specifically interacts with the capsid protein of hepatitis B virus (HBV). We found that DBT1 stabilizes protein-protein interaction, accelerates capsid assembly, and can induce formation of aberrant particles. Paradoxically, DBT1 can cause preformed capsids to dissociate. These activities may lead to (i) assembly of empty and defective capsids, inhibiting formation of new virus, and (ii) disruption of mature viruses, which are metastable, to inhibit new infection. Using cryo-electron microscopy, we observed that DBT1 led to asymmetric capsids where well-defined DBT1 density was bound at all intersubunit contacts. These results suggest that DBT1 can support assembly by increasing buried surface area but induce disassembly of metastable capsids by favoring asymmetry to induce structural defects.
History
DepositionApr 3, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 3, 2020Provider: repository / Type: Initial release
Revision 1.1Jul 1, 2020Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Mar 6, 2024Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model / pdbx_struct_oper_list
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _pdbx_struct_oper_list.name / _pdbx_struct_oper_list.symmetry_operation / _pdbx_struct_oper_list.type

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Structure visualization

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  • Biological unit as complete icosahedral assembly
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  • Biological unit as icosahedral pentamer
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  • Biological unit as icosahedral 23 hexamer
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  • Deposited structure unit
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  • Simplified surface model + fitted atomic model
  • EMDB-21653
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  • Superimposition on EM map
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Structure viewerMolecule:
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Assembly

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


Theoretical massNumber of molelcules
Total (without water)68,9798
Polymers67,1644
Non-polymers1,8144
Water00
1
A: Capsid protein
B: Capsid protein
C: Capsid protein
D: Capsid protein
hetero molecules
x 60


Theoretical massNumber of molelcules
Total (without water)4,138,713480
Polymers4,029,865240
Non-polymers108,848240
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation59
2


  • Idetical with deposited unit
  • icosahedral asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3
A: Capsid protein
B: Capsid protein
C: Capsid protein
D: Capsid protein
hetero molecules
x 5


  • icosahedral pentamer
  • 345 kDa, 20 polymers
Theoretical massNumber of molelcules
Total (without water)344,89340
Polymers335,82220
Non-polymers9,07120
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: Capsid protein
B: Capsid protein
C: Capsid protein
D: Capsid protein
hetero molecules
x 6


  • icosahedral 23 hexamer
  • 414 kDa, 24 polymers
Theoretical massNumber of molelcules
Total (without water)413,87148
Polymers402,98624
Non-polymers10,88524
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation5
5


  • Idetical with deposited unit
  • icosahedral asymmetric unit, std point frame
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
SymmetryPoint symmetry: (Schoenflies symbol: I (icosahedral))

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Components

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


Mass: 16791.104 Da / Num. of mol.: 4 / Fragment: UNP residues 1-149
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Hepatitis B virus genotype D subtype adw
Production host: Escherichia coli (E. coli) / References: UniProt: P03147
#2: Chemical
ChemComp-U0A / 11-oxo-N-[2-(4-sulfamoylphenyl)ethyl]-10,11-dihydrodibenzo[b,f][1,4]thiazepine-8-carboxamide


Mass: 453.534 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C22H19N3O4S2 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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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 genotype D subtype adw / Type: VIRUS / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Hepatitis B virus genotype D subtype adw / Strain: isolate United Kingdom/adyw/1979
Source (recombinant)Organism: Escherichia coli (E. coli)
Details of virusEmpty: YES / Enveloped: NO / Isolate: OTHER / Type: VIRUS-LIKE PARTICLE
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
150 mMHEPESC8H18N2O4S1
2300 mMSodium ChlorideNaCl1
SpecimenConc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
VitrificationInstrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 33 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 679

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Processing

EM software
IDNameVersionCategoryDetails
4CTFFIND4.1CTF correction
7Coot0.8.7model fitting
12RELION33D reconstructionAutomated B-factor Sharpening
13PHENIX1.11model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 24823
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 4.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 11080 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL / Target criteria: Correlation Coefficient
Atomic model buildingPDB-ID: 6BVF

6bvf


Pdb chain-ID: A / Accession code: 6BVF / Pdb chain residue range: 1-143 / Source name: PDB / Type: experimental model

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