Scalable agroinfiltration-based production of SARS-CoV-2 antigens for use in diagnostic assays and subunit vaccines

PLoS One. 2022 Dec 14;17(12):e0277668. doi: 10.1371/journal.pone.0277668. eCollection 2022.

Abstract

Agroinfiltration is a method used in biopharming to support plant-based biosynthesis of therapeutic proteins such as antibodies and viral antigens involved in vaccines. Major advantages of generating proteins in plants is the low cost, massive scalability and the rapid yield of the technology. Herein, we report the agroinfiltration-based production of glycosylated SARS-CoV-2 Spike receptor-binding domain (RBD) protein. We show that it exhibits high-affinity binding to the SARS-CoV-2 receptor angiotensin-converting enzyme 2 (ACE2) and displays folding similar to antigen produced in mammalian expression systems. Moreover, our plant-expressed RBD was readily detected by IgM, IgA, and IgG antibodies from the serum of SARS-CoV-2 infected and vaccinated individuals. We further demonstrate that binding of plant-expressed RBD to ACE2 is efficiently neutralized by these antibodies. Collectively, these findings demonstrate that recombinant RBD produced via agroinfiltration exhibits suitable biochemical and antigenic features for use in serological and neutralization assays, and in subunit vaccine platforms.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiotensin-Converting Enzyme 2
  • Animals
  • Antibodies, Viral
  • COVID-19* / prevention & control
  • Humans
  • Mammals / metabolism
  • SARS-CoV-2*
  • Spike Glycoprotein, Coronavirus
  • Vaccines, Subunit

Substances

  • Angiotensin-Converting Enzyme 2
  • Antibodies, Viral
  • Spike Glycoprotein, Coronavirus
  • Vaccines, Subunit
  • spike protein, SARS-CoV-2

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