1887

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Volume 104, Issue 10

Recombinant rotavirus expressing the glycosylated S1 protein of SARS-CoV-2 Open Access

Abstract

Reverse genetic systems have been used to introduce heterologous sequences into the rotavirus segmented double-stranded (ds)RNA genome, enabling the generation of recombinant viruses that express foreign proteins and possibly serve as vaccine vectors. Notably, insertion of SARS-CoV-2 sequences into the segment seven (NSP3) RNA of simian SA11 rotavirus was previously shown to result in the production of recombinant viruses that efficiently expressed the N-terminal domain (NTD) and the receptor-binding domain (RBD) of the S1 region of the SARS-CoV-2 spike protein. However, efforts to generate a similar recombinant (r) SA11 virus that efficiently expressed full-length S1 were less successful. In this study, we describe modifications to the S1-coding cassette inserted in the segment seven RNA that allowed recovery of second-generation rSA11 viruses that efficiently expressed the ~120-kDa S1 protein. The ~120-kDa S1 products were shown to be glycosylated, based on treatment with endoglycosidase H, which reduced the protein to a size of ~80 kDa. Co-pulldown assays demonstrated that the ~120-kDa S1 proteins had affinity for the human ACE2 receptor. Although all the second-generation rSA11 viruses expressed glycosylated S1 with affinity for the ACE receptor, only the S1 product of one virus (rSA11/S1f) was appropriately recognized by anti-S1 antibodies, suggesting the rSA11/S1f virus expressed an authentic form of S1. Compared to the other second-generation rSA11 viruses, the design of the rSA11/S1f was unique, encoding an S1 product that did not include an N-terminal FLAG tag. Probably due to the impact of FLAG tags upstream of the S1 signal peptides, the S1 products of the other viruses (rSA11/3fS1 and rSA11/3fS1-His) may have undergone defective glycosylation, impeding antibody binding. In summary, these results indicate that recombinant rotaviruses can serve as expression vectors of foreign glycosylated proteins, raising the possibility of generating rotavirus-based vaccines that can induce protective immune responses against enteric and mucosal viruses with glycosylated capsid components, including SARS-CoV-2.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): expression vector , glycosylation , rotavirus , SARS-CoV-2 and spike protein
Funding
This study was supported by the:
  • Blatt Endowment
    • Principle Award Recipient: JohnThomas Patton
  • GIVAX,INC
    • Principle Award Recipient: JohnThomas Patton
  • Division of Intramural Research, National Institute of Allergy and Infectious Diseases (Award R21AI44881)
    • Principle Award Recipient: JohnThomas Patton
© 2023 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2023-10-13
2024-05-20
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Recombinant rotavirus expressing the glycosylated S1 protein of SARS-CoV-2
J. Gen. Virol. 104, 001899 (2023); https://doi.org/10.1099/jgv.0.001899
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