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- EMDB-9597: Postfusion state of SARS-CoV spike glycoprotein -

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Basic information

Entry
Database: EMDB / ID: EMD-9597
TitlePostfusion state of SARS-CoV spike glycoprotein
Map data
SamplePostfusion state of SARS-CoV spike glycoprotein
Biological speciesSARS coronavirus
Methodsingle particle reconstruction / cryo EM / Resolution: 30.5 Å
AuthorsGui M / Song W
CitationJournal: PLoS Pathog / Year: 2018
Title: Cryo-EM structure of the SARS coronavirus spike glycoprotein in complex with its host cell receptor ACE2.
Authors: Wenfei Song / Miao Gui / Xinquan Wang / Ye Xiang /
Abstract: The trimeric SARS coronavirus (SARS-CoV) surface spike (S) glycoprotein consisting of three S1-S2 heterodimers binds the cellular receptor angiotensin-converting enzyme 2 (ACE2) and mediates fusion ...The trimeric SARS coronavirus (SARS-CoV) surface spike (S) glycoprotein consisting of three S1-S2 heterodimers binds the cellular receptor angiotensin-converting enzyme 2 (ACE2) and mediates fusion of the viral and cellular membranes through a pre- to postfusion conformation transition. Here, we report the structure of the SARS-CoV S glycoprotein in complex with its host cell receptor ACE2 revealed by cryo-electron microscopy (cryo-EM). The complex structure shows that only one receptor-binding domain of the trimeric S glycoprotein binds ACE2 and adopts a protruding "up" conformation. In addition, we studied the structures of the SARS-CoV S glycoprotein and its complexes with ACE2 in different in vitro conditions, which may mimic different conformational states of the S glycoprotein during virus entry. Disassociation of the S1-ACE2 complex from some of the prefusion spikes was observed and characterized. We also characterized the rosette-like structures of the clustered SARS-CoV S2 trimers in the postfusion state observed on electron micrographs. Structural comparisons suggested that the SARS-CoV S glycoprotein retains a prefusion architecture after trypsin cleavage into the S1 and S2 subunits and acidic pH treatment. However, binding to the receptor opens up the receptor-binding domain of S1, which could promote the release of the S1-ACE2 complex and S1 monomers from the prefusion spike and trigger the pre- to postfusion conformational transition.
History
DepositionJul 26, 2018-
Header (metadata) releaseAug 8, 2018-
Map releaseAug 8, 2018-
UpdateAug 22, 2018-
Current statusAug 22, 2018Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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Structure viewerEM map:
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Supplemental images

Downloads & links

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Map

FileDownload / File: emd_9597.map.gz / Format: CCP4 / Size: 22.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
2.54 Å/pix.
x 180 pix.
= 457.2 Å
2.54 Å/pix.
x 180 pix.
= 457.2 Å
2.54 Å/pix.
x 180 pix.
= 457.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 2.54 Å
Density
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.070570275 - 0.2379134
Average (Standard dev.)0.0008792665 (±0.009064926)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions180180180
Spacing180180180
CellA=B=C: 457.19998 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.542.542.54
M x/y/z180180180
origin x/y/z0.0000.0000.000
length x/y/z457.200457.200457.200
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ288288288
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS180180180
D min/max/mean-0.0710.2380.001

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Supplemental data

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Segmentation: #1

Fileemd_9597_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Sample components

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Entire Postfusion state of SARS-CoV spike glycoprotein

EntireName: Postfusion state of SARS-CoV spike glycoprotein / Number of components: 1

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Component #1: protein, Postfusion state of SARS-CoV spike glycoprotein

ProteinName: Postfusion state of SARS-CoV spike glycoprotein / Recombinant expression: No
SourceSpecies: SARS coronavirus
Source (engineered)Expression System: Spodoptera frugiperda (fall armyworm)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionpH: 5.8
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
ImagingMicroscope: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 50 e/Å2 / Illumination mode: FLOOD BEAM
LensImaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: C3 (3 fold cyclic) / Number of projections: 7636
3D reconstructionResolution: 30.5 Å / Resolution method: FSC 0.143 CUT-OFF
FSC plot (resolution estimation)

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