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- EMDB-3292: Sub-tomogram averaging of Lassa virus glycoprotein spike from vir... -

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Basic information

Entry
Database: EMDB / ID: EMD-3292
TitleSub-tomogram averaging of Lassa virus glycoprotein spike from virus-like particles at pH 5
Map dataSub-tomogram average of the glycoprotein spike trimer
Sample
  • Sample: Purified Lassa virus VLPs at pH 5
  • Virus: Lassa virus
Keywordslassa virus / membrane protein / glycoprotein / receptor binding / membrane fusion
Function / homology
Function and homology information


host cell Golgi membrane / receptor-mediated endocytosis of virus by host cell / host cell endoplasmic reticulum membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane / virion membrane / membrane / metal ion binding
Similarity search - Function
Arenavirus glycoprotein, zinc binding domain / Arenavirus glycoprotein / Arenavirus glycoprotein
Similarity search - Domain/homology
Pre-glycoprotein polyprotein GP complex
Similarity search - Component
Biological speciesLassa virus
Methodsubtomogram averaging / cryo EM / Resolution: 16.4 Å
AuthorsLi S / Zhaoyang S / Pryce R / Parsy M-L / Fehling SK / Schlie K / Siebert CA / Garten W / Bowden TA / Strecker T / Huiskonen JT
CitationJournal: PLoS Pathog / Year: 2016
Title: Acidic pH-Induced Conformations and LAMP1 Binding of the Lassa Virus Glycoprotein Spike.
Authors: Sai Li / Zhaoyang Sun / Rhys Pryce / Marie-Laure Parsy / Sarah K Fehling / Katrin Schlie / C Alistair Siebert / Wolfgang Garten / Thomas A Bowden / Thomas Strecker / Juha T Huiskonen /
Abstract: Lassa virus is an enveloped, bi-segmented RNA virus and the most prevalent and fatal of all Old World arenaviruses. Virus entry into the host cell is mediated by a tripartite surface spike complex, ...Lassa virus is an enveloped, bi-segmented RNA virus and the most prevalent and fatal of all Old World arenaviruses. Virus entry into the host cell is mediated by a tripartite surface spike complex, which is composed of two viral glycoprotein subunits, GP1 and GP2, and the stable signal peptide. Of these, GP1 binds to cellular receptors and GP2 catalyzes fusion between the viral envelope and the host cell membrane during endocytosis. The molecular structure of the spike and conformational rearrangements induced by low pH, prior to fusion, remain poorly understood. Here, we analyzed the three-dimensional ultrastructure of Lassa virus using electron cryotomography. Sub-tomogram averaging yielded a structure of the glycoprotein spike at 14-Å resolution. The spikes are trimeric, cover the virion envelope, and connect to the underlying matrix. Structural changes to the spike, following acidification, support a viral entry mechanism dependent on binding to the lysosome-resident receptor LAMP1 and further dissociation of the membrane-distal GP1 subunits.
History
DepositionJan 9, 2016-
Header (metadata) releaseJan 20, 2016-
Map releaseFeb 17, 2016-
UpdateMar 2, 2016-
Current statusMar 2, 2016Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 1.26
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 1.26
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-5ft2
  • Surface level: 1.26
  • Imaged by UCSF Chimera
  • Download
  • Surface view with fitted model
  • Atomic models: PDB-5ft2
  • Surface level: 1.26
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_3292.tif

Downloads & links

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Map

FileDownload / File: emd_3292.map.gz / Format: CCP4 / Size: 7.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSub-tomogram average of the glycoprotein spike trimer
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
2.7 Å/pix.
x 128 pix.
= 345.6 Å		2.7 Å/pix.
x 128 pix.
= 345.6 Å		2.7 Å/pix.
x 128 pix.
= 345.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 2.7 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.26 / Movie #1: 1.26
Minimum - Maximum-2.64815164 - 5.33520031
Average (Standard dev.)0.01424912 (±0.51957446)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions128128128
Spacing128128128
CellA=B=C: 345.6 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.72.72.7
M x/y/z128128128
origin x/y/z0.0000.0000.000
length x/y/z345.600345.600345.600
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS128128128
D min/max/mean-2.6485.3350.014

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Supplemental data

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Sample components

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Entire : Purified Lassa virus VLPs at pH 5

EntireName: Purified Lassa virus VLPs at pH 5
Components
  • Sample: Purified Lassa virus VLPs at pH 5
  • Virus: Lassa virus

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Supramolecule #1000: Purified Lassa virus VLPs at pH 5

SupramoleculeName: Purified Lassa virus VLPs at pH 5 / type: sample / ID: 1000 / Details: Unfixed virus-like particles / Number unique components: 1

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Supramolecule #1: Lassa virus

SupramoleculeName: Lassa virus / type: virus / ID: 1 / Name.synonym: Lassa mammarenavirus / NCBI-ID: 11620 / Sci species name: Lassa virus / Sci species strain: Josiah / Virus type: VIRUS-LIKE PARTICLE / Virus isolate: STRAIN / Virus enveloped: Yes / Virus empty: No / Syn species name: Lassa mammarenavirus
Host (natural)Organism: Mastomys (multimammate rats) / synonym: VERTEBRATES
Host systemOrganism: Canis lupus (gray wolf) / Recombinant cell: Madin-Darby canine kidney

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Experimental details

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Structure determination

Methodcryo EM
Processingsubtomogram averaging
Aggregation stateparticle

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Sample preparation

BufferpH: 5.2
Details: 50 mM buffer of succinic acid, dihydrogen phosphate and glycine (2:7:7)
GridDetails: Grids (Cflat CF-2/1-2C-T) were glow-discharged for 15 s. 6-nm gold particles were added.
VitrificationCryogen name: ETHANE-PROPANE MIXTURE / Chamber humidity: 80 % / Chamber temperature: 120 K / Instrument: GATAN CRYOPLUNGE 3 / Method: Blot for 3 seconds before plunging.

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Electron microscopy

MicroscopeFEI POLARA 300
TemperatureMin: 80 K / Max: 120 K
Alignment procedureLegacy - Astigmatism: Objective lens astigmatism was corrected at 160,000 times magnification.
Specialist opticsEnergy filter - Name: GIF QUANTUM LS / Energy filter - Lower energy threshold: 0.0 eV / Energy filter - Upper energy threshold: 20.0 eV
DetailsSuper-resolution counting mode
DateSep 25, 2014
Image recordingCategory: CCD / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Digitization - Sampling interval: 5 µm / Number real images: 16 / Average electron dose: 60 e/Å2
Details: Each image is a tilt series of 19 movies, acquired at 5 degree intervals. Each movie consists of 8 frames.
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 37037 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.0 mm / Nominal defocus max: 6.7 µm / Nominal defocus min: 2.8 µm / Nominal magnification: 160000
Sample stageSpecimen holder: Liquid nitrogen cooled / Specimen holder model: OTHER / Tilt series - Axis1 - Min angle: -45 ° / Tilt series - Axis1 - Max angle: 45 °
Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company

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Image processing

DetailsA smaller subset of subtomograms was picked manually. The data set was extended using template-based picking. No C3 symmetry was imposed during picking or initial stages of refinement.
Final reconstructionApplied symmetry - Point group: C3 (3 fold cyclic) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 16.4 Å / Resolution method: OTHER / Software - Name: IMOD, Dynamo / Number subtomograms used: 2578
CTF correctionDetails: Each tilted image
Final 3D classificationNumber classes: 1
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

4zjf


Chain - Chain ID: B
SoftwareName: Chimera, Segger
DetailsThe GP1 subunit was fitted to different density segments of the spike. 1000 evenly rotated fits were considered.
RefinementSpace: REAL / Protocol: RIGID BODY FIT / Target criteria: Cross-correlation
Output model

PDB-5ft2:
Sub-tomogram averaging of Lassa virus glycoprotein spike from virus- like particles at pH 5

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