Download MendeleyBat and pangolin coronavirus spike glycoprotein structures provide insights into SARS-CoV-2 evolution.
Zhang, S., Qiao, S., Yu, J., Zeng, J., Shan, S., Tian, L., Lan, J., Zhang, L., Wang, X.(2021) Nat Commun 12: 1607-1607
- PubMed: 33707453
- DOI: https://doi.org/10.1038/s41467-021-21767-3
- Primary Citation of Related Structures:
7CN4, 7CN8 - PubMed Abstract:
In recognizing the host cellular receptor and mediating fusion of virus and cell membranes, the spike (S) glycoprotein of coronaviruses is the most critical viral protein for cross-species transmission and infection. Here we determined the cryo-EM structures of the spikes from bat (RaTG13) and pangolin (PCoV_GX) coronaviruses, which are closely related to SARS-CoV-2. All three receptor-binding domains (RBDs) of these two spike trimers are in the "down" conformation, indicating they are more prone to adopt the receptor-binding inactive state. However, we found that the PCoV_GX, but not the RaTG13, spike is comparable to the SARS-CoV-2 spike in binding the human ACE2 receptor and supporting pseudovirus cell entry. We further identified critical residues in the RBD underlying different activities of the RaTG13 and PCoV_GX/SARS-CoV-2 spikes. These results collectively indicate that tight RBD-ACE2 binding and efficient RBD conformational sampling are required for the evolution of SARS-CoV-2 to gain highly efficient infection.
Organizational Affiliation:
The Ministry of Education Key Laboratory of Protein Science, Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center for Biological Structure, Collaborative Innovation Center for Biotherapy, School of Life Sciences, Tsinghua University, 100084, Beijing, China.
