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An engineered receptor-binding domain improves the immunogenicity of multivalent SARS-CoV-2 vaccines
Brian D Quinlan; Wenhui Li; Huihui Mou; Lizhou Zhang; Jing Chang; Shoujiao Peng; Amrita Ojha; Rubens Tavora; Mark S Parcells; Guangxiang George Luo; Wenhui Li; Guocai Zhong; Hyeryun Choe; Michael Farzan.
Afiliación
  • Brian D Quinlan; The Scripps Research Institute
  • Wenhui Li; The Scripps Research Institute
  • Huihui Mou; The Scripps Research Institute
  • Lizhou Zhang; The Scripps Research Institute
  • Jing Chang; The Scripps Research Institute
  • Shoujiao Peng; The Scripps Research Institute
  • Amrita Ojha; The Scripps Research Institute
  • Rubens Tavora; The Scripps Research Institute
  • Mark S Parcells; University of Delaware
  • Guangxiang George Luo; University of Alabama at Birmingham School of Medicine
  • Wenhui Li; National Institute of Biological Sciences
  • Guocai Zhong; Shenzhen Bay Laboratory
  • Hyeryun Choe; The Scripps Research Institute
  • Michael Farzan; The Scripps Research Institute
Preprint en En | PREPRINT-BIORXIV | ID: ppbiorxiv-388934
ABSTRACT
The SARS-coronavirus 2 (SARS-CoV-2) spike (S) protein mediates viral entry into cells expressing the angiotensin-converting enzyme 2 (ACE2). The S protein engages ACE2 through its receptor-binding domain (RBD), an independently folded 197-amino acid fragment of the 1273-amino acid S-protein protomer. The RBD is the primary SARS-CoV-2 neutralizing epitope and a critical target of any SARS-CoV-2 vaccine. Here we show that this RBD conjugated to each of two carrier proteins elicited more potent neutralizing responses in immunized rodents than did a similarly conjugated proline-stabilized S-protein ectodomain. Nonetheless, the native RBD expresses inefficiently, limiting its usefulness as a vaccine antigen. However, we show that an RBD engineered with four novel glycosylation sites (gRBD) expresses markedly more efficiently, and generates a more potent neutralizing responses as a DNA vaccine antigen, than the wild-type RBD or the full-length S protein, especially when fused to multivalent carriers such as an H. pylori ferritin 24-mer. Further, gRBD is more immunogenic than the wild-type RBD when administered as a subunit protein vaccine. Our data suggest that multivalent gRBD antigens can reduce costs and doses, and improve the immunogenicity, of all major classes of SARS-CoV-2 vaccines.
Licencia
cc_by_nc_nd
Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-BIORXIV Idioma: En Año: 2020 Tipo del documento: Preprint
Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-BIORXIV Idioma: En Año: 2020 Tipo del documento: Preprint