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- EMDB-21497: HBV D78S mutant capsid -

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Basic information

Entry
Database: EMDB / ID: EMD-21497
TitleHBV D78S mutant capsid
Map dataHBV D78S mutant capsid
Sample
  • Complex: HBV D78S mutant capsid
    • Protein or peptide: Capsid protein
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
Biological speciesHepatitis B virus genotype D subtype adw (isolate United Kingdom/adyw/1979)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.6 Å
AuthorsZhao Z / Wang J / Zlotnick A
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01-AI11893 United States
CitationJournal: ACS Chem Biol / Year: 2020
Title: The Integrity of the Intradimer Interface of the Hepatitis B Virus Capsid Protein Dimer Regulates Capsid Self-Assembly.
Authors: Zhongchao Zhao / Joseph Che-Yen Wang / Carolina Pérez Segura / Jodi A Hadden-Perilla / Adam Zlotnick /
Abstract: During the hepatitis B virus lifecycle, 120 copies of homodimeric capsid protein assemble around a copy of reverse transcriptase and viral RNA and go on to produce an infectious virion. Assembly ...During the hepatitis B virus lifecycle, 120 copies of homodimeric capsid protein assemble around a copy of reverse transcriptase and viral RNA and go on to produce an infectious virion. Assembly needs to be tightly regulated by protein conformational change to ensure symmetry, fidelity, and reproducibility. Here, we show that structures at the intradimer interface regulate conformational changes at the distal interdimer interface and so regulate assembly. A pair of interacting charged residues, D78 from each monomer, conspicuously located at the top of a four-helix bundle that forms the intradimer interface, were mutated to serine to disrupt communication between the two monomers. The mutation slowed assembly and destabilized the dimer to thermal and chemical denaturation. Mutant dimers showed evidence of transient partial unfolding based on the appearance of new proteolytically sensitive sites. Though the mutant dimer was less stable, the resulting capsids were as stable as the wildtype, based on assembly and thermal denaturation studies. Cryo-EM image reconstructions of capsid indicated that the subunits adopted an "open" state more usually associated with a free dimer and that the spike tips were either disordered or highly flexible. Molecular dynamics simulations provide mechanistic explanations for these results, suggesting that D78 stabilizes helix 4a, which forms part of the intradimer interface, by capping its N-terminus and hydrogen-bonding to nearby residues, whereas the D78S mutation disrupts these interactions, leading to partial unwinding of helix 4a. This in turn weakens the connection from helix 4 and the intradimer interface to helix 5, which forms the interdimer interface.
History
DepositionMar 1, 2020-
Header (metadata) releaseApr 15, 2020-
Map releaseSep 30, 2020-
UpdateDec 30, 2020-
Current statusDec 30, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.018
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.018
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6w0k
  • Surface level: 0.018
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6w0k
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21497.png

Downloads & links

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Map

FileDownload / File: emd_21497.map.gz / Format: CCP4 / Size: 476.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationHBV D78S mutant capsid
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.84 Å/pix.
x 500 pix.
= 421.5 Å		0.84 Å/pix.
x 500 pix.
= 421.5 Å		0.84 Å/pix.
x 500 pix.
= 421.5 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.843 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.018 / Movie #1: 0.018
Minimum - Maximum-0.06270417 - 0.09714335
Average (Standard dev.)0.0003186164 (±0.005812644)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-250-250-250
Dimensions500500500
Spacing500500500
CellA=B=C: 421.5 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8430.8430.843
M x/y/z500500500
origin x/y/z0.0000.0000.000
length x/y/z421.500421.500421.500
α/β/γ90.00090.00090.000
start NX/NY/NZ212211153
NX/NY/NZ80102186
MAP C/R/S123
start NC/NR/NS-250-250-250
NC/NR/NS500500500
D min/max/mean-0.0630.0970.000

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Supplemental data

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Sample components

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Entire : HBV D78S mutant capsid

EntireName: HBV D78S mutant capsid
Components
  • Complex: HBV D78S mutant capsid
    • Protein or peptide: Capsid protein

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Supramolecule #1: HBV D78S mutant capsid

SupramoleculeName: HBV D78S mutant capsid / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Hepatitis B virus genotype D subtype adw (isolate United Kingdom/adyw/1979)
Strain: isolate United Kingdom/adyw/1979
Recombinant expressionOrganism: Escherichia coli (E. coli)

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Macromolecule #1: Capsid protein

MacromoleculeName: Capsid protein / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Hepatitis B virus genotype D subtype adw (isolate United Kingdom/adyw/1979)
Strain: isolate United Kingdom/adyw/1979
Molecular weightTheoretical: 16.756148 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MDIDPYKEFG ATVELLSFLP SDFFPSVRDL LDTAAALYRD ALESPEHCSP HHTALRQAIL CWGDLMTLAT WVGTNLESPA SRDLVVSYV NTNVGLKFRQ LLWFHISCLT FGRETVLEYL VSFGVWIRTP PAYRPPNAPI LSTLPETTVV

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration15 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6bvf

Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 73871
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: PROJECTION MATCHING

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Atomic model buiding 1

RefinementProtocol: RIGID BODY FIT
Output model

PDB-6w0k:
HBV D78S mutant capsid

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