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- EMDB-43726: Cryo-EM structure of BTV subcore -

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Basic information

Entry
Database: EMDB / ID: EMD-43726
TitleCryo-EM structure of BTV subcore
Map data
Sample
  • Virus: Bluetongue virus (serotype 1 / isolate South Africa)
    • Protein or peptide: Core protein VP3
KeywordsBluetongue virus / capsid protein / assembly intermediate / virion / VIRAL PROTEIN
Function / homologyInner layer core protein VP3, Orbivirus / Orbivirus VP3 (T2) protein / Inner layer core protein VP3, Reovirus / structural molecule activity / Core protein VP3
Function and homology information
Biological speciesBluetongue virus (serotype 1 / isolate South Africa)
Methodsingle particle reconstruction / cryo EM / Resolution: 6.5 Å
AuthorsXia X / Sung PY / Martynowycz MW / Gonen T / Roy P / Zhou ZH
Funding support United States, United Kingdom, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI094386 United States
Wellcome TrustWT221749/20/Z United Kingdom
CitationJournal: Cell / Year: 2024
Title: RNA genome packaging and capsid assembly of bluetongue virus visualized in host cells.
Authors: Xian Xia / Po-Yu Sung / Michael W Martynowycz / Tamir Gonen / Polly Roy / Z Hong Zhou /
Abstract: Unlike those of double-stranded DNA (dsDNA), single-stranded DNA (ssDNA), and ssRNA viruses, the mechanism of genome packaging of dsRNA viruses is poorly understood. Here, we combined the techniques ...Unlike those of double-stranded DNA (dsDNA), single-stranded DNA (ssDNA), and ssRNA viruses, the mechanism of genome packaging of dsRNA viruses is poorly understood. Here, we combined the techniques of high-resolution cryoelectron microscopy (cryo-EM), cellular cryoelectron tomography (cryo-ET), and structure-guided mutagenesis to investigate genome packaging and capsid assembly of bluetongue virus (BTV), a member of the Reoviridae family of dsRNA viruses. A total of eleven assembly states of BTV capsid were captured, with resolutions up to 2.8 Å, with most visualized in the host cytoplasm. ATPase VP6 was found underneath the vertices of capsid shell protein VP3 as an RNA-harboring pentamer, facilitating RNA packaging. RNA packaging expands the VP3 shell, which then engages middle- and outer-layer proteins to generate infectious virions. These revealed "duality" characteristics of the BTV assembly mechanism reconcile previous contradictory co-assembly and core-filling models and provide insights into the mysterious RNA packaging and capsid assembly of Reoviridae members and beyond.
History
DepositionFeb 16, 2024-
Header (metadata) releaseApr 24, 2024-
Map releaseApr 24, 2024-
UpdateMay 8, 2024-
Current statusMay 8, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43726.png

Downloads & links

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Map

FileDownload / File: emd_43726.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 320 pix.
= 352. Å		1.1 Å/pix.
x 320 pix.
= 352. Å		1.1 Å/pix.
x 320 pix.
= 352. Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.015
Minimum - Maximum-0.037551142 - 0.04037724
Average (Standard dev.)0.0005609449 (±0.0036528944)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 352.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_43726_half_map_1.map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_43726_half_map_2.map
Projections & Slices
AxesZYX

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Histogram (log scale)

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Sample components

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Entire : Bluetongue virus (serotype 1 / isolate South Africa)

EntireName: Bluetongue virus (serotype 1 / isolate South Africa)
Components
  • Virus: Bluetongue virus (serotype 1 / isolate South Africa)
    • Protein or peptide: Core protein VP3

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Supramolecule #1: Bluetongue virus (serotype 1 / isolate South Africa)

SupramoleculeName: Bluetongue virus (serotype 1 / isolate South Africa) / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / NCBI-ID: 10905
Sci species name: Bluetongue virus (serotype 1 / isolate South Africa)
Virus type: VIRUS-LIKE PARTICLE / Virus isolate: SPECIES / Virus enveloped: No / Virus empty: No
Host (natural)Organism: Ovis aries (sheep)

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Macromolecule #1: Core protein VP3

MacromoleculeName: Core protein VP3 / type: protein_or_peptide / ID: 1 / Number of copies: 10 / Enantiomer: LEVO
Source (natural)Organism: Bluetongue virus (serotype 1 / isolate South Africa)
Molecular weightTheoretical: 103.410508 KDa
SequenceString: MAAQNEQRPE RIKTTPYLEG DVLSSDSGPL LSVFALQEIM QKVRQVQADY MTATREVDFT VPDVQKILDD IKALAAEQVY KIVKVPSIS FRHIVMQSRD RVLRVDTYYE EMSQVGDVIT EDEPEKFYST IIKKVRFIRG KGSFILHDIP TRDHRGMEVA E PEVLGVEF ...String:
MAAQNEQRPE RIKTTPYLEG DVLSSDSGPL LSVFALQEIM QKVRQVQADY MTATREVDFT VPDVQKILDD IKALAAEQVY KIVKVPSIS FRHIVMQSRD RVLRVDTYYE EMSQVGDVIT EDEPEKFYST IIKKVRFIRG KGSFILHDIP TRDHRGMEVA E PEVLGVEF KNVLPVLTAE HRAMIQNALD GSIIENGNVA TRDVDVFIGA CSEPVYRIYN RLQGYIEAVQ LQELRNSIGW LE RLGHRKR ITYSQEVLTD FRRQDTIWVL ALQLPVNPQV VWDVPRSSIA NLIMNIATCL PTGEYIAPNP RISSITLTQR ITT TGPFAI LTGSTPTAQQ LNDVRKIYLA LMFPGQIILD LKIDPGERMD PAVRMVAGVV GHLLFTAGGR FTNLTQNMAR QLDI ALNDY LLYMYNTRVQ VNYGPTGEPL DFQIGRNQYD CNVFRADFAT GTGYNGWATI DVEYREPAPY VHAQRYIRYC GIDSR ELIN PTTYGIGMTY HCYNEMLRML VAAGKDSEAA YFRSMLPFHM VRFARINQII NEDLHSVFSL PDDMFNALLP DLIAGA HQN ADPVVLDVSW ISLWFAFNRS FEPTHRNEML EVAPLIESVY ASELSVMKVD MRHLSLMQRR FPDVLIQARP SHFWKAV LN DSPEAVKAVM NLSHSHNFIN IRDMMRWVML PSLQPSLKLA LEEEAWAAAN DFEDLMLTDQ VYMHRDMLPE PRLDDIER F RQEGFYYTNM LEAPPEIDRV VQYTYEIARL QANMGQFRAA LRRIMDDDDW VRFGGVLRTV RVKFYDARPP DDVLQGLPF SYDTNERGGL AYATIKYATE TTIFYLIYNV EFSNTPDSLV LINPTYTMTK VFINKRIVER VRVGQILAVL NRRFVAYKGK MRIMDITQS LKMGTKLAAP TV

UniProtKB: Core protein VP3

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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: 8.8 / Component - Concentration: 20.0 mM / Component - Name: Tris
GridModel: PELCO Ultrathin Carbon with Lacey Carbon / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 281.15 K / Instrument: FEI VITROBOT MARK IV
DetailsVirus isolated from infected BHK cells

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 3 / Number real images: 62928 / Average exposure time: 2.0 sec. / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.6 µm / Nominal defocus min: 1.8 µm / Nominal magnification: 81000
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: 2124
Startup modelType of model: OTHER
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C5 (5 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 6.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 2124
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final 3D classificationNumber classes: 1 / Avg.num./class: 2124 / Software - Name: RELION (ver. 3.1)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 159
Output model

PDB-8w1i:
Cryo-EM structure of BTV subcore

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