Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: microscopy

Macromolecule Content

• Total Structure Weight: 401.29 kDa 
• Atom Count: 24906 
• Modelled Residue Count: 3195 
• Deposited Residue Count: 3609 
• Unique protein chains: 1

6ACC

Trypsin-cleaved and low pH-treated SARS-CoV spike glycoprotein and ACE2 complex, ACE2-free conformation with three RBD in down conformation

• PDB DOI: 10.2210/pdb6ACC/pdb
• EM Map EMD-9588:EMDBEMDataResource

• Classification: VIRAL PROTEIN
• Organism(s): Severe acute respiratory syndrome-related coronavirus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2018-07-26 Released: 2018-08-08 
• Deposition Author(s): Gui, M., Song, W.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.60 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of the SARS coronavirus spike glycoprotein in complex with its host cell receptor ACE2.

Song, W., Gui, M., Wang, X., Xiang, Y.

(2018) PLoS Pathog 14: e1007236-e1007236

• PubMed: 30102747 
• DOI: 10.1371/journal.ppat.1007236
• Primary Citation of Related Structures:  
  6ACC, 6ACD, 6ACG, 6ACJ, 6ACK


• PubMed 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 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.

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Organizational Affiliation: 

Center for Infectious Disease Research, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Beijing Advanced Innovation Center for Structural Biology, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Spike glycoprotein	A, B, C	1203	Severe acute respiratory syndrome-related coronavirus	Mutation(s): 0  Gene Names: S, 2
UniProt
Find proteins for P59594 (Severe acute respiratory syndrome coronavirus) Explore P59594  Go to UniProtKB:  P59594

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.60 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2018-07-26 
• Released Date: 2018-08-08 
Deposition Author(s): Gui, M., Song, W.

Revision History  

• Version 1.0: 2018-08-08
  Type: Initial release
  
• Version 1.1: 2018-08-22
  Changes: Data collection, Database references
• Version 1.2: 2019-11-06
  Changes: Data collection, Other