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- PDB-6edj: Cryo-EM structure of Woodchuck hepatitis virus capsid -

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Basic information

Entry
Database: PDB / ID: 6edj
TitleCryo-EM structure of Woodchuck hepatitis virus capsid
ComponentsExternal core antigen
KeywordsVIRUS LIKE PARTICLE / WHV / Capsid structure
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 / : / virus-mediated perturbation of host defense response / viral penetration into host nucleus / host cell cytoplasm / symbiont entry into host cell / host cell nucleus / structural molecule activity ...virus-mediated perturbation of host defense response => GO:0019049 / microtubule-dependent intracellular transport of viral material towards nucleus / T=4 icosahedral viral capsid / : / virus-mediated perturbation of host defense response / viral penetration into host nucleus / host cell cytoplasm / symbiont entry into host cell / host cell nucleus / 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
External core antigen / External core antigen
Similarity search - Component
Biological speciesWoodchuck hepatitis virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.52 Å
AuthorsZhao, Z. / 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)R01-AI11893 United States
CitationJournal: J Virol / Year: 2019
Title: Structural Differences between the Woodchuck Hepatitis Virus Core Protein in the Dimer and Capsid States Are Consistent with Entropic and Conformational Regulation of Assembly.
Authors: Zhongchao Zhao / Joseph Che-Yen Wang / Giovanni Gonzalez-Gutierrez / Balasubramanian Venkatakrishnan / Roi Asor / Daniel Khaykelson / Uri Raviv / Adam Zlotnick /
Abstract: Hepadnaviruses are hepatotropic enveloped DNA viruses with an icosahedral capsid. Hepatitis B virus (HBV) causes chronic infection in an estimated 240 million people; woodchuck hepatitis virus (WHV), ...Hepadnaviruses are hepatotropic enveloped DNA viruses with an icosahedral capsid. Hepatitis B virus (HBV) causes chronic infection in an estimated 240 million people; woodchuck hepatitis virus (WHV), an HBV homologue, has been an important model system for drug development. The dimeric capsid protein (Cp) has multiple functions during the viral life cycle and thus has become an important target for a new generation of antivirals. Purified HBV and WHV Cp spontaneously assemble into 120-dimer capsids. Though they have 65% identity, WHV Cp has error-prone assembly with stronger protein-protein association. We have taken advantage of the differences in assemblies to investigate the basis of assembly regulation. We determined the structures of the WHV capsid to 4.5-Å resolution by cryo-electron microscopy (cryo-EM) and of the WHV Cp dimer to 2.9-Å resolution by crystallography and examined the biophysical properties of the dimer. We found, in dimer, that the subdomain that makes protein-protein interactions is partially disordered and rotated 21° from its position in capsid. This subdomain is susceptible to proteolysis, consistent with local disorder. WHV assembly shows similar susceptibility to HBV antiviral molecules, suggesting that HBV assembly follows similar transitions. These data show that there is an entropic cost for assembly that is compensated for by the energetic gain of burying hydrophobic interprotein contacts. We propose a series of stages in assembly that incorporate a disorder-to-order transition and structural shifts. We suggest that a cascade of structural changes may be a common mechanism for regulating high-fidelity capsid assembly in HBV and other viruses. Virus capsids assemble spontaneously with surprisingly high fidelity. This requires strict geometry and a narrow range of association energies for these protein-protein interactions. It was hypothesized that requiring subunits to undergo a conformational change to become assembly active could regulate assembly by creating an energetic barrier and attenuating association. We found that woodchuck hepatitis virus capsid protein undergoes structural transitions between its dimeric and its 120-dimer capsid states. It is likely that the closely related hepatitis B virus capsid protein undergoes similar structural changes, which has implications for drug design. Regulation of assembly by structural transition may be a common mechanism for many viruses.
History
DepositionAug 9, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 1, 2019Provider: repository / Type: Initial release
Revision 1.1Nov 13, 2019Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Dec 18, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.3Mar 13, 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

Movie
  • 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
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  • Superimposition on EM map
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Structure viewerMolecule:
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Assembly

Deposited unit
A: External core antigen
B: External core antigen
C: External core antigen
D: External core antigen


Theoretical massNumber of molelcules
Total (without water)68,5064
Polymers68,5064
Non-polymers00
Water0
1
A: External core antigen
B: External core antigen
C: External core antigen
D: External core antigen
x 60


Theoretical massNumber of molelcules
Total (without water)4,110,352240
Polymers4,110,352240
Non-polymers00
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: External core antigen
B: External core antigen
C: External core antigen
D: External core antigen
x 5


  • icosahedral pentamer
  • 343 kDa, 20 polymers
Theoretical massNumber of molelcules
Total (without water)342,52920
Polymers342,52920
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: External core antigen
B: External core antigen
C: External core antigen
D: External core antigen
x 6


  • icosahedral 23 hexamer
  • 411 kDa, 24 polymers
Theoretical massNumber of molelcules
Total (without water)411,03524
Polymers411,03524
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation5
5


  • Idetical with deposited unit in distinct coordinate
  • icosahedral asymmetric unit, std point frame
TypeNameSymmetry operationNumber
transform to point frame1
SymmetryPoint symmetry: (Schoenflies symbol: I (icosahedral))

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Components

#1: Protein
External core antigen / capsid / HBeAg / Precore protein / p25


Mass: 17126.465 Da / Num. of mol.: 4 / Fragment: UNP residues 31-179
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Woodchuck hepatitis virus / Production host: Escherichia coli (E. coli) / References: UniProt: P0C6J4, UniProt: P0C6J2*PLUS

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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: Woodchuck hepatitis virus / Type: VIRUS / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Woodchuck hepatitis virus
Source (recombinant)Organism: Escherichia coli (E. coli)
Details of virusEmpty: YES / Enveloped: NO / Isolate: OTHER / Type: VIRUS-LIKE PARTICLE
Buffer solutionpH: 7.5
SpecimenConc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
VitrificationCryogen name: ETHANE / Humidity: 100 %

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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 FIELDBright-field microscopy
Image recordingElectron dose: 30 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameCategory
1EMAN2particle selection
2RELIONparticle selection
5EMAN2CTF correction
6RELIONCTF correction
9MDFFmodel fitting
10PHENIXmodel fitting
12PHENIXmodel refinement
15RELIONclassification
16RELION3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 4.52 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 7911 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 6ECS

6ecs


Accession code: 6ECS / Source name: PDB / Type: experimental model

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