期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 27, 期 8, 页码 763-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41594-020-0468-7
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资金
- Francis Crick Institute - Cancer Research UK [FC001078, FC001143]
- Francis Crick Institute - UK Medical Research Council [FC001078, FC001143]
- Francis Crick Institute - Wellcome Trust [FC001078, FC001143]
- 100 Top Talents Program of Sun Yat-sen University
- Sanming Project of Medicine in Shenzhen [SZSM201911003]
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. Cryo-EM and functional analyses of furin-cleaved spike from SARS-CoV-2 and the closely related spike from bat virus RaTG13 reveal differences in protein stability and binding to human receptor ACE2.
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