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- EMDB-21261: Asymmetry reconstruction of Brome mosaic virus (RNA 3 and 4) -

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Basic information

Database: EMDB / ID: EMD-21261
TitleAsymmetry reconstruction of Brome mosaic virus (RNA 3 and 4)
Map data
  • Virus: Brome mosaic virus
Biological speciesBrome mosaic virus
Methodsingle particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsBeren C / Cui YX / Chakravarty A / Yang X / Rao ALN / Knobler CM / Zhou ZH / Gelbart WM
Funding support United States, 2 items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States) United States
National Institutes of Health/National Institute on Alcohol Abuse and Alcoholism (NIH/NIAAA) United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2020
Title: Genome organization and interaction with capsid protein in a multipartite RNA virus.
Authors: Christian Beren / Yanxiang Cui / Antara Chakravarty / Xue Yang / A L N Rao / Charles M Knobler / Z Hong Zhou / William M Gelbart /
Abstract: We report the asymmetric reconstruction of the single-stranded RNA (ssRNA) content in one of the three otherwise identical virions of a multipartite RNA virus, brome mosaic virus (BMV). We exploit a ...We report the asymmetric reconstruction of the single-stranded RNA (ssRNA) content in one of the three otherwise identical virions of a multipartite RNA virus, brome mosaic virus (BMV). We exploit a sample consisting exclusively of particles with the same RNA content-specifically, RNAs 3 and 4-assembled in planta by agrobacterium-mediated transient expression. We find that the interior of the particle is nearly empty, with most of the RNA genome situated at the capsid shell. However, this density is disordered in the sense that the RNA is not associated with any particular structure but rather, with an ensemble of secondary/tertiary structures that interact with the capsid protein. Our results illustrate a fundamental difference between the ssRNA organization in the multipartite BMV viral capsid and the monopartite bacteriophages MS2 and Qβ for which a dominant RNA conformation is found inside the assembled viral capsids, with RNA density conserved even at the center of the particle. This can be understood in the context of the differing demands on their respective lifecycles: BMV must package separately each of several different RNA molecules and has been shown to replicate and package them in isolated, membrane-bound, cytoplasmic complexes, whereas the bacteriophages exploit sequence-specific "packaging signals" throughout the viral RNA to package their monopartite genomes.
DepositionJan 30, 2020-
Header (metadata) releaseMay 20, 2020-
Map releaseMay 20, 2020-
UpdateMay 27, 2020-
Current statusMay 27, 2020Processing site: RCSB / Status: Released

Structure visualization

  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
Supplemental images

Downloads & links


FileDownload / File: emd_21261.map.gz / Format: CCP4 / Size: 166.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 352 pix.
= 376.64 Å
1.07 Å/pix.
x 352 pix.
= 376.64 Å
1.07 Å/pix.
x 352 pix.
= 376.64 Å



Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Contour LevelBy AUTHOR: 0.02 / Movie #1: 0.02
Minimum - Maximum-0.043379545 - 0.100155376
Average (Standard dev.)0.0025642102 (±0.009843324)
SymmetrySpace group: 1


Map geometry
Axis orderXYZ
CellA=B=C: 376.64 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z352352352
origin x/y/z0.0000.0000.000
length x/y/z376.640376.640376.640
start NX/NY/NZ000
MAP C/R/S123
start NC/NR/NS000
D min/max/mean-0.0430.1000.003

Supplemental data

Sample components

Entire : Brome mosaic virus

EntireName: Brome mosaic virus
  • Virus: Brome mosaic virus

Supramolecule #1: Brome mosaic virus

SupramoleculeName: Brome mosaic virus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: #1-#3 / NCBI-ID: 12302 / Sci species name: Brome mosaic virus / Virus type: VIRION / Virus isolate: SPECIES / Virus enveloped: No / Virus empty: No

Experimental details

Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

Sample preparation

BufferpH: 7.2
VitrificationCryogen name: ETHANE-PROPANE

Electron microscopy

Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-30 / Average electron dose: 48.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

Image processing

Startup modelType of model: OTHER / Details: a Gaussian ball
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 70470

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