SARS-CoV-2 and bat RaTG13 spike glycoprotein structures inform on virus evolution and furin-cleavage effects.
SARS-CoV-2 is thought to have emerged from bats, possibly via a secondary host. Here, we investigate the relationship of spike (S) glycoprotein from SARS-CoV-2 with the S protein of a closely related bat virus, RaTG13. We determined cryo-EM structures for RaTG13 S and for both furin-cleaved and uncleaved SARS-CoV-2 S; ... we compared these with recently reported structures for uncleaved SARS-CoV-2 S. We also biochemically characterized their relative stabilities and affinities for the SARS-CoV-2 receptor ACE2. Although the overall structures of human and bat virus S proteins are similar, there are key differences in their properties, including a more stable precleavage form of human S and about 1,000-fold tighter binding of SARS-CoV-2 to human receptor. These observations suggest that cleavage at the furin-cleavage site decreases the overall stability of SARS-CoV-2 S and facilitates the adoption of the open conformation that is required for S to bind to the ACE2 receptor.
Mesh Terms:
Angiotensin-Converting Enzyme 2, Animals, Betacoronavirus, Binding Sites, COVID-19, Chiroptera, Coronavirus Infections, Cryoelectron Microscopy, Evolution, Molecular, Furin, Gene Expression, HEK293 Cells, Host-Pathogen Interactions, Humans, Models, Molecular, Pandemics, Peptidyl-Dipeptidase A, Pneumonia, Viral, Protein Binding, Protein Conformation, alpha-Helical, Protein Conformation, beta-Strand, Protein Interaction Domains and Motifs, Protein Isoforms, Protein Stability, Proteolysis, Receptors, Virus, Recombinant Proteins, SARS-CoV-2, Spike Glycoprotein, Coronavirus, Structural Homology, Protein
Angiotensin-Converting Enzyme 2, Animals, Betacoronavirus, Binding Sites, COVID-19, Chiroptera, Coronavirus Infections, Cryoelectron Microscopy, Evolution, Molecular, Furin, Gene Expression, HEK293 Cells, Host-Pathogen Interactions, Humans, Models, Molecular, Pandemics, Peptidyl-Dipeptidase A, Pneumonia, Viral, Protein Binding, Protein Conformation, alpha-Helical, Protein Conformation, beta-Strand, Protein Interaction Domains and Motifs, Protein Isoforms, Protein Stability, Proteolysis, Receptors, Virus, Recombinant Proteins, SARS-CoV-2, Spike Glycoprotein, Coronavirus, Structural Homology, Protein
Nat Struct Mol Biol
Date: Aug. 01, 2020
PubMed ID: 32647346
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