Cited by 121SARS-CoV-2 and COVID-19 ResearchAnimal Virus Infections StudiesCOVID-19 Clinical Research Studies

Q493K and Q498H substitutions in Spike promote adaptation of SARS-CoV-2 in mice

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Huang, Kun, Zhang, Yufei, Hui, Xianfeng, Zhao, Ya, Gong, Wenxiao, Wang, Ting, Zhang, Shaoran, Yang, Yong +9 more·2021·EBioMedicine

Abstract

BACKGROUND: An ideal animal model to study SARS-coronavirus 2 (SARS-CoV-2) pathogenesis and evaluate therapies and vaccines should reproduce SARS-CoV-2 infection and recapitulate lung disease like those seen in humans. The angiotensin-converting enzyme 2 (ACE2) is a functional receptor for SARS-CoV-2, but mice are resistant to the infection because their ACE2 is incompatible with the receptor-binding domain (RBD) of the SARS-CoV-2 spike protein . METHODS: SARS-CoV-2 was passaged in BALB/c mice to obtain mouse-adapted virus strain. Complete genome deep sequencing of different generations of viruses was performed to characterize the dynamics of the adaptive mutations in SARS-CoV-2. Indirect immunofluorescence analysis and Biolayer interferometry experiments determined the binding affinity of mouse-adapted SARS-CoV-2 WBP-1 RBD to mouse ACE2 and human ACE2. Finally, we tested whether TLR7/8 agonist Resiquimod (R848) could also inhibit the replication of WBP-1 in the mouse model. FINDINGS: The mouse-adapted strain WBP-1 showed increased infectivity in BALB/c mice and led to severe interstitial pneumonia. We characterized the dynamics of the adaptive mutations in SARS-CoV-2 and demonstrated that Q493K and Q498H in RBD significantly increased its binding affinity towards mouse ACE2. Additionally, the study tentatively found that the TLR7/8 agonist Resiquimod was able to protect mice against WBP-1 challenge. Therefore, this mouse-adapted strain is a useful tool to investigate COVID-19 and develop new therapies. INTERPRETATION: We found for the first time that the Q493K and Q498H mutations in the RBD of WBP-1 enhanced its interactive affinities with mACE2. The mouse-adapted SARS-CoV-2 provides a valuable tool for the evaluation of novel antiviral and vaccine strategies. This study also tentatively verified the antiviral activity of TLR7/8 agonist Resiquimod against SARS-CoV-2 in vitro and in vivo. FUNDING: This research was funded by the National Key Research and Development Program of China (2020YFC0845600) and Emergency Science and Technology Project of Hubei Province (2020FCA046) and Robert A. Welch Foundation (C-1565).

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  1. [45]Dinnon K. Leist S. Schäfer A. Edwards C. Martinez D. Montgomery S. A mouse-adapted model of SARS-CoV-2 to test COVID-19 countermeasures Nature 586 7830 2020 560 566 32854108 PMC8034761
  2. [51]Zhao J. Wohlford-Lenane C. Zhao J. Fleming E. Lane T.E. McCray P.B. Jr. Intranasal treatment with poly(I*C) protects aged mice from lethal respiratory virus infections J Virol 86 21 2012 11416 11424 22915814 PMC3486278

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Authors
Huang, K., Zhang, Y., Hui, X., Zhao, Y., Gong, W., Wang, T., Zhang, S., Yang, Y., Deng, F., Zhang, Q., Chen, X., Yang, Y., Sun, X., Chen, H., Tao, Y. J., Zou, Z., & Jin, M.
Affiliations
  • Huazhong Agricultural University (CN)
  • Rice University (US)
Corresponding author
  • Zou, Zhong
  • Jin, Meilin
Venue
EBioMedicine
Publisher
Elsevier BV
Published
2021-05
Volume
67
Pages
103381
ISSN
2352-3964 (ISSN-L)
OpenAlex
W3162133013
Cited by
119
References
52
Citations by year
2026: 5 · 2025: 8 · 2024: 20 · 2023: 17 · 2022: 55 · 2021: 14
FWCI
8.55
Type
journal article
Language
en
Open access
Locations
  • EBioMedicine (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Rice Research Repository (Rice University) (submittedVersion, cc-by-nc-nd)
Funders
  • Welch Foundation (C-1565)
  • Chinese Academy of Sciences
  • Hubei Province Department of Science and Technology (2020FCA046)
  • State Key Laboratory of Virology
  • National Key Research and Development Program of China (2020YFC0845600)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
  • Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
Keywords
SARS-CoV-2, spike protein, receptor binding domain, mouse-adapted virus, ACE2 receptor, receptor binding affinity, interstitial lung disease, TLR7/8 agonist, resiquimod, antiviral activity, adaptive mutation
MeSH terms
Whole Genome Sequencing, Angiotensin-Converting Enzyme 2, COVID-19, SARS-CoV-2, Adaptation, Physiological, Animals, Binding Sites, Chlorocebus aethiops, Disease Models, Animal, Female, Humans, Imidazoles, Mice, Inbred BALB C, Serial Passage, Vero Cells, Virus Replication, Caco-2 Cells, Amino Acid Substitution, Mice, High-Throughput Nucleotide Sequencing, Spike Glycoprotein, Coronavirus

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