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- EMDB-20670: HBV T=4 particle -

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Basic information

Entry
Database: EMDB / ID: EMD-20670
TitleHBV T=4 particle
Map dataHBV T=4 particle
Sample
  • Virus: Hepatitis B virus
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
Similarity search - Function
Hepatitis core antigen / Viral capsid core domain supefamily, Hepatitis B virus / Hepatitis core antigen
Similarity search - Domain/homology
Core protein / Capsid protein
Similarity search - Component
Biological speciesHepatitis B virus
Methodsingle particle reconstruction / cryo EM / Resolution: 3.65 Å
AuthorsWu W
CitationJournal: PLoS Comput Biol / Year: 2020
Title: Expression of quasi-equivalence and capsid dimorphism in the Hepadnaviridae.
Authors: Weimin Wu / Norman R Watts / Naiqian Cheng / Rick Huang / Alasdair C Steven / Paul T Wingfield /
Abstract: Hepatitis B virus (HBV) is a leading cause of liver disease. The capsid is an essential component of the virion and it is therefore of interest how it assembles and disassembles. The capsid protein ...Hepatitis B virus (HBV) is a leading cause of liver disease. The capsid is an essential component of the virion and it is therefore of interest how it assembles and disassembles. The capsid protein is unusual both for its rare fold and that it polymerizes according to two different icosahedral symmetries, causing the polypeptide chain to exist in seven quasi-equivalent environments: A, B, and C in AB and CC dimers in T = 3 capsids, and A, B, C, and D in AB and CD dimers in T = 4 capsids. We have compared the two capsids by cryo-EM at 3.5 Å resolution. To ensure a valid comparison, the two capsids were prepared and imaged under identical conditions. We find that the chains have different conformations and potential energies, with the T = 3 C chain having the lowest. Three of the four quasi-equivalent dimers are asymmetric with respect to conformation and potential energy; however, the T = 3 CC dimer is symmetrical and has the lowest potential energy although its intra-dimer interface has the least free energy of formation. Of all the inter-dimer interfaces, the CB interface has the least area and free energy, in both capsids. From the calculated energies of higher-order groupings of dimers discernible in the lattices we predict early assembly intermediates, and indeed we observe such structures by negative stain EM of in vitro assembly reactions. By sequence analysis and computational alanine scanning we identify key residues and motifs involved in capsid assembly. Our results explain several previously reported observations on capsid assembly, disassembly, and dimorphism.
History
DepositionSep 3, 2019-
Header (metadata) releaseOct 2, 2019-
Map releaseOct 2, 2019-
UpdateMay 6, 2020-
Current statusMay 6, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.009
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.009
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6ui7
  • Surface level: 0.009
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6ui7
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20670.png

Downloads & links

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Map

FileDownload / File: emd_20670.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationHBV T=4 particle
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.93 Å/pix.
x 480 pix.
= 446.4 Å		0.93 Å/pix.
x 480 pix.
= 446.4 Å		0.93 Å/pix.
x 480 pix.
= 446.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.93 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.009 / Movie #1: 0.009
Minimum - Maximum-0.026205488 - 0.047773425
Average (Standard dev.)0.00001400111 (±0.0025410028)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-240-240-240
Dimensions480480480
Spacing480480480
CellA=B=C: 446.4 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.930.930.93
M x/y/z480480480
origin x/y/z0.0000.0000.000
length x/y/z446.400446.400446.400
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS-240-240-240
NC/NR/NS480480480
D min/max/mean-0.0260.0480.000

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Supplemental data

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Sample components

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Entire : Hepatitis B virus

EntireName: Hepatitis B virus
Components
  • Virus: Hepatitis B virus

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Supramolecule #1: Hepatitis B virus

SupramoleculeName: Hepatitis B virus / type: virus / ID: 1 / Parent: 0 / NCBI-ID: 10407 / Sci species name: Hepatitis B virus / Virus type: VIRION / Virus isolate: OTHER / Virus enveloped: No / Virus empty: Yes
Host systemOrganism: Escherichia phage EcSzw-2 (virus)

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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: 7.4
GridDetails: unspecified
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI POLARA 300
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 25.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: OTHER
Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.65 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 14000
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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