Issue 2, 2022

A COVID-19 vaccine candidate composed of the SARS-CoV-2 RBD dimer and Neisseria meningitidis outer membrane vesicles

Abstract

SARS-CoV-2 infection is mediated by the interaction of the spike glycoprotein trimer via its receptor-binding domain (RBD) with the host's cellular receptor. Vaccines seek to block this interaction by eliciting neutralizing antibodies, most of which are directed toward the RBD. Many protein subunit vaccines require powerful adjuvants to generate a potent antibody response. Here, we report on the use of a SARS-CoV-2 dimeric recombinant RBD combined with Neisseria meningitidis outer membrane vesicles (OMVs), adsorbed on alum, as a promising COVID-19 vaccine candidate. This formulation induces a potent and neutralizing immune response in laboratory animals, which is higher than that of the dimeric RBD alone adsorbed on alum. Sera of people vaccinated with this vaccine candidate, named Soberana01, show a high inhibition level of the RBD-ACE2 interaction using RBD mutants corresponding to SARS-CoV-2 variants of concern and wild-type expressed using the phage display technology. To our knowledge, this is the first time that the immunostimulation effect of N. meningitidis OMVs is evaluated in vaccine candidates against SARS-CoV-2.

Graphical abstract: A COVID-19 vaccine candidate composed of the SARS-CoV-2 RBD dimer and Neisseria meningitidis outer membrane vesicles

Supplementary files

Article information

Article type
Paper
Submitted
19 okt 2021
Accepted
01 dec 2021
First published
08 dec 2021
This article is Open Access
Creative Commons BY-NC license

RSC Chem. Biol., 2022,3, 242-249

A COVID-19 vaccine candidate composed of the SARS-CoV-2 RBD dimer and Neisseria meningitidis outer membrane vesicles

D. Santana-Mederos, R. Perez-Nicado, Y. Climent, L. Rodriguez, B. S. Ramirez, S. Perez-Rodriguez, M. Rodriguez, C. Labrada, T. Hernandez, M. Diaz, I. Orosa, U. Ramirez, R. Oliva, R. Garrido, F. Cardoso, M. Landys, R. Martinez, H. Gonzalez, T. Hernandez, R. Ochoa-Azze, J. L. Perez, J. Enriquez, N. Gonzalez, Y. Infante, L. A. Espinosa, Y. Ramos, L. J. González, C. Valenzuela, A. V. Casadesus, B. Fernandez, G. Rojas, B. Pérez-Massón, Y. Tundidor, E. Bermudez, C. A. Plasencia, T. Boggiano, E. Ojito, F. Chiodo, S. Fernandez, F. Paquet, C. Fang, G. Chen, D. G. Rivera, Y. Valdes-Balbin, D. Garcia-Rivera and V. Verez Bencomo, RSC Chem. Biol., 2022, 3, 242 DOI: 10.1039/D1CB00200G

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