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Virus-Cell Interactions

Receptor recognition by novel coronavirus from Wuhan: An analysis based on decade-long structural studies of SARS

Yushun Wan, Jian Shang, Rachel Graham, Ralph S. Baric, Fang Li
Yushun Wan
1 Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, USA
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Jian Shang
1 Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, USA
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Rachel Graham
2 Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA
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Ralph S. Baric
2 Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA
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Fang Li
1 Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN, USA
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  • For correspondence: lifang@umn.edu
DOI: 10.1128/JVI.00127-20
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ABSTRACT

Recently a novel coronavirus (2019-nCoV) has emerged from Wuhan, China, causing symptoms in humans similar to those caused by SARS coronavirus (SARS-CoV). Since SARS-CoV outbreak in 2002, extensive structural analyses have revealed key atomic-level interactions between SARS-CoV spike protein receptor-binding domain (RBD) and its host receptor angiotensin-converting enzyme 2 (ACE2), which regulate both the cross-species and human-to-human transmissions of SARS-CoV. Here we analyzed the potential receptor usage by 2019-nCoV, based on the rich knowledge about SARS-CoV and the newly released sequence of 2019-nCoV. First, the sequence of 2019-nCoV RBD, including its receptor-binding motif (RBM) that directly contacts ACE2, is similar to that of SARS-CoV, strongly suggesting that 2019-nCoV uses ACE2 as its receptor. Second, several critical residues in 2019-nCoV RBM (particularly Gln493) provide favorable interactions with human ACE2, consistent with 2019-nCoV's capacity for human cell infection. Third, several other critical residues in 2019-nCoV RBM (particularly Asn501) are compatible with, but not ideal for, binding human ACE2, suggesting that 2019-nCoV has acquired some capacity for human-to-human transmission. Last, while phylogenetic analysis indicates a bat origin of 2019-nCoV, 2019-nCoV also potentially recognizes ACE2 from a diversity of animal species (except mice and rats), implicating these animal species as possible intermediate hosts or animal models for 2019-nCoV infections. These analyses provide insights into the receptor usage, cell entry, host cell infectivity and animal origin of 2019-nCoV, and may help epidemic surveillance and preventive measures against 2019-nCoV.

Significance

The recent emergence of Wuhan coronavirus (2019-nCoV) puts the world on alert. 2019-nCoV is reminiscent of the SARS-CoV outbreak in 2002-2003. Our decade-long structural studies on the receptor recognition by SARS-CoV have identified key interactions between SARS-CoV spike protein and its host receptor angiotensin-converting enzyme 2 (ACE2), which regulate both the cross-species and human-to-human transmissions of SARS-CoV. One of the goals of SARS-CoV research was to build an atomic-level iterative framework of virus-receptor interactions to facilitate epidemic surveillance, predict species-specific receptor usage, and identify potential animal hosts and animal models of viruses. Based on the sequence of 2019-nCoV spike protein, we apply this predictive framework to provide novel insights into the receptor usage and likely host range of 2019-nCoV. This study provides a robust test of this reiterative framework, providing the basic, translational and public health research communities with predictive insights that may help study and battle this novel 2019-nCoV.

  • Copyright © 2020 American Society for Microbiology.

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Receptor recognition by novel coronavirus from Wuhan: An analysis based on decade-long structural studies of SARS
Yushun Wan, Jian Shang, Rachel Graham, Ralph S. Baric, Fang Li
Journal of Virology Jan 2020, JVI.00127-20; DOI: 10.1128/JVI.00127-20

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Receptor recognition by novel coronavirus from Wuhan: An analysis based on decade-long structural studies of SARS
Yushun Wan, Jian Shang, Rachel Graham, Ralph S. Baric, Fang Li
Journal of Virology Jan 2020, JVI.00127-20; DOI: 10.1128/JVI.00127-20
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