7WSG | pdb_00007wsg

Cryo-EM structure of SARS-CoV spike receptor-binding domain in complex with sea lion ACE2

• PDB DOI: https://doi.org/10.2210/pdb7WSG/pdb
• EM Map EMD-32757: EMDB EMDataResource

• Classification: VIRAL PROTEIN
• Organism(s): Mammalia, Severe acute respiratory syndrome coronavirus
• Expression System: Escherichia coli, Homo sapiens
• Mutation(s): No 


• Deposited: 2022-01-29 Released: 2022-11-09 
• Deposition Author(s): Li, S., Han, P., Qi, J.
• Funding Organization(s): Chinese Academy of Sciences

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.03 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental

Literature

Cross-species recognition and molecular basis of SARS-CoV-2 and SARS-CoV binding to ACE2s of marine animals.

Li, S., Yang, R., Zhang, D., Han, P., Xu, Z., Chen, Q., Zhao, R., Zhao, X., Qu, X., Zheng, A., Wang, L., Li, L., Hu, Y., Zhang, R., Su, C., Niu, S., Zhang, Y., Qi, J., Liu, K., Wang, Q., Gao, G.F.

(2022) Natl Sci Rev 9: nwac122-nwac122

• PubMed: 36187898 
• DOI: https://doi.org/10.1093/nsr/nwac122
• Primary Citation Related Structures: 
  7WSE, 7WSF, 7WSG, 7WSH


• PubMed Abstract: 
  

  Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has an extremely broad host range that includes hippopotami, which are phylogenetically closely related to whales. The cellular ACE2 receptor is one of the key determinants of the host range. Here, we found that ACE2s from several marine mammals and hippopotami could efficiently bind to the receptor-binding domain (RBD) of both SARS-CoV and SARS-CoV-2 and facilitate the transduction of SARS-CoV and SARS-CoV-2 pseudoviruses into ACE2-expressing cells. We further resolved the cryo-electron microscopy complex structures of the minke whale ACE2 and sea lion ACE2, respectively, bound to the RBDs, revealing that they have similar binding modes to human ACE2 when it comes to the SARS-CoV-2 RBD and SARS-CoV RBD. Our results indicate that marine mammals could potentially be new victims or virus carriers of SARS-CoV-2, which deserves further careful investigation and study. It will provide an early warning for the prospective monitoring of marine mammals.

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Organizational Affiliation: 
• CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing100101, China.
College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong030801, China.
Faculty of Health Sciences, University of Macau, Macau, China.
Institute of Physical Science and Information, Anhui University, Hefei230039, China.
Center for Influenza Research and Early-Warning (CASCIRE), Chinese Academy of Sciences, Beijing100101, China.
Savaid Medical School, University of Chinese Academy of Sciences, Beijing100049, China.
School of Life Sciences, University of Science and Technology of China, Hefei230026, China.
State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning530004, China.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 114.7 kDa 
• Atom Count: 6,413 
• Modeled Residue Count: 787 
• Deposited Residue Count: 996 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Angiotensin-converting enzyme	A	806	Mammalia	Mutation(s): 0  Gene Names: ACE2 EC: 3.4
UniProt
Find proteins for A0A6J2EID0 (Zalophus californianus) Explore A0A6J2EID0  Go to UniProtKB:  A0A6J2EID0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Spike protein S1	B	190	Severe acute respiratory syndrome coronavirus	Mutation(s): 0  Gene Names: S, 2
UniProt
Find proteins for P59594 (Severe acute respiratory syndrome coronavirus) Explore P59594  Go to UniProtKB:  P59594

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN (Subject of Investigation/LOI)	C [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.03 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2022-11-09 
Deposition Author(s): Li, S., Han, P., Qi, J.

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Funding Organization	Location	Grant Number
Chinese Academy of Sciences	China	XDB29010202

Revision History  

• Version 1.0: 2022-11-09
  Type: Initial release
  
• Version 1.1: 2024-11-13
  Changes: Data collection, Refinement description, Structure summary
• Version 1.2: 2025-07-02
  Changes: Data collection