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TitleRBD-depleted SARS-CoV-2 spike generates protective immunity in cynomolgus macaques.
Journal, issue, pagesNPJ Vaccines, Vol. 10, Issue 1, Page 63, Year 2025
Publish dateMar 30, 2025
AuthorsHélène Letscher / Delphine Guilligay / Gregory Effantin / Axelle Amen / Guidenn Sulbaran / Judith A Burger / Laetitia Bossevot / Laura Junges / Marco Leonec / Julie Morin / Matthieu Van Tilbeurgh / Cécile Hérate / Anne-Sophie Gallouët / Francis Relouzat / Sylvie van der Werf / Mariangela Cavarelli / Nathalie Dereuddre-Bosquet / Marit J van Gils / Rogier W Sanders / Pascal Poignard / Roger Le Grand / Winfried Weissenhorn /
PubMed AbstractThe SARS-CoV-2 pandemic revealed the rapid evolution of circulating strains. This led to new variants carrying mostly mutations within the receptor binding domain, which is immunodominant upon ...The SARS-CoV-2 pandemic revealed the rapid evolution of circulating strains. This led to new variants carrying mostly mutations within the receptor binding domain, which is immunodominant upon immunization and infection. In order to steer the immune response away from RBD epitopes to more conserved domains, we generated S glycoprotein trimers without RBD and stabilized them by formaldehyde cross-linking. The cryoEM structure demonstrated that SΔRBD folds into the native prefusion conformation, stabilized by one specific cross-link between S2 protomers. SΔRBD was coated onto lipid vesicles, to produce synthetic virus-like particles, SΔRBD-LV, which were utilized in a heterologous prime-boost strategy. Immunization of cynomolgus macaques either three times with the mRNA Comirnaty vaccine or two times followed by SΔRBD-LV showed that the SΔRBD-LV boost induced similar antibody titers and neutralization of different variants, including omicron. Upon challenge with omicron XBB.3, both the Comirnaty only and Comirnaty/SΔRBD-LV vaccination schemes conferred similar overall protection from infection for both the Comirnaty only and Comirnaty/SΔRBD-LV vaccination schemes. However, the SΔRBD-LV boost indicated better protection against lung infection than the Comirnaty strategy alone. Together our findings indicate that SΔRBD is highly immunogenic and provides improved protection compared to a third mRNA boost indicative of superior antibody-based protection.
External linksNPJ Vaccines / PubMed:40159504 / PubMed Central
MethodsEM (single particle)
Resolution3.0 Å
Structure data

18997

8r87

EMDB-18997, PDB-8r87:
Cryo-EM structure of the Sars-Cov2 S trimer without RBDs
Method: EM (single particle) / Resolution: 3.0 Å

Source
  • severe acute respiratory syndrome coronavirus
  • enterobacteria phage t4 (virus)
KeywordsVIRAL PROTEIN / glycoprotein

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