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- EMDB-12819: Hepatitis B core protein -

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Basic information

Entry
Database: EMDB / ID: EMD-12819
TitleHepatitis B core protein
Map data
Sample
  • Virus: Hepatitis B virus
    • Protein or peptide: External core antigen
KeywordsHepatitis B core protein / VIRUS LIKE PARTICLE
Function / homologyHepatitis 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 / : / structural molecule activity / extracellular region / External core antigen
Function and homology information
Biological speciesHepatitis B virus
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsBottcher B / Makbul C
Funding support Germany, 1 items
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, 2021-
Header (metadata) releaseJun 2, 2021-
Map releaseJun 2, 2021-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.03
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  • Surface view colored by radius
  • Surface level: 0.03
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  • Surface view with fitted model
  • Atomic models: PDB-7od4
  • Surface level: 0.03
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7od4
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_12819.png

Downloads & links

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Map

FileDownload / File: emd_12819.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 400 pix.
= 425.4 Å		1.06 Å/pix.
x 400 pix.
= 425.4 Å		1.06 Å/pix.
x 400 pix.
= 425.4 Å

Surface

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Slices (1/2)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0635 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.025 / Movie #1: 0.03
Minimum - Maximum-0.13472301 - 0.21730484
Average (Standard dev.)0.00038888532 (±0.014627224)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 425.40002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.06351.06351.0635
M x/y/z400400400
origin x/y/z0.0000.0000.000
length x/y/z425.400425.400425.400
α/β/γ90.00090.00090.000
start NX/NY/NZ727265
NX/NY/NZ157157169
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS400400400
D min/max/mean-0.1350.2170.000

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Supplemental data

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Mask #1

Fileemd_12819_msk_1.map
Projections & Slices
AxesZYX

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Half map: #1

Fileemd_12819_half_map_1.map
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Histogram

Histogram (log scale)

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Half map: #2

Fileemd_12819_half_map_2.map
Projections & Slices
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Sample components

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Entire : Hepatitis B virus

EntireName: Hepatitis B virus
Components
  • Virus: Hepatitis B virus
    • Protein or peptide: External core antigen

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Supramolecule #1: Hepatitis B virus

SupramoleculeName: Hepatitis B virus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / NCBI-ID: 10407 / Sci species name: Hepatitis B virus / Sci species strain: genotype D subtype ayw / Virus type: VIRUS-LIKE PARTICLE / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No
Host (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 4.8 MDa
Virus shellShell ID: 1 / Name: capsid / Diameter: 360.0 Å / T number (triangulation number): 4

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Macromolecule #1: External core antigen

MacromoleculeName: External core antigen / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Hepatitis B virus
Molecular weightTheoretical: 21.146217 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MDIDPYKEFG ATVELLSFLP SDFFPSVRDL LDTASALYRE ALESPEHCSP HHTALRQAIL CWGELMTLAT WVGVNLEDPA SRDLVVSYV NTNMGLKFRQ LLWFHISCLT FGRETVIEYL VSFGVWIRTP PAYRPPNAPI LSTLPETTVV RRRGRSPRRR T PSPRRRRS QSPRRRRSQS RESQC

UniProtKB: External core antigen

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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

BufferpH: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Support film - Material: CARBON / Support film - topology: HOLEY ARRAY / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 120 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.029 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: INTEGRATING / Number grids imaged: 1 / Number real images: 2423 / Average exposure time: 2.5 sec. / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 75000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 228237
Startup modelType of model: EMDB MAP
EMDB ID:

12810

Final reconstructionApplied symmetry - Point group: I (icosahedral) / Resolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 142173
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

6htx

chain_id: c, source_name: PDB, initial_model_type: experimental model

6htx

chain_id: A, source_name: PDB, initial_model_type: experimental model

6htx

chain_id: B, source_name: PDB, initial_model_type: experimental model

6htx

chain_id: D, source_name: PDB, initial_model_type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 106
Output model

PDB-7od4:
Hepatitis B core protein.

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