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TitleBroadly neutralizing antibody induction by non-stabilized SARS-CoV-2 Spike mRNA vaccination in nonhuman primates.
Journal, issue, pagesbioRxiv, Year 2023
Publish dateDec 19, 2023
AuthorsR Dilshan Malewana / Victoria Stalls / Aaron May / Xiaozhi Lu / David R Martinez / Alexandra Schäfer / Dapeng Li / Maggie Barr / Laura L Sutherland / Esther Lee / Robert Parks / Whitney Edwards Beck / Amanda Newman / Kevin W Bock / Mahnaz Minai / Bianca M Nagata / C Todd DeMarco / Thomas N Denny / Thomas H Oguin / Wes Rountree / Yunfei Wang / Katayoun Mansouri / Robert J Edwards / Gregory D Sempowski / Amanda Eaton / Hiromi Muramatsu / Rory Henderson / Ying Tam / Christopher Barbosa / Juanjie Tang / Derek W Cain / Sampa Santra / Ian N Moore / Hanne Andersen / Mark G Lewis / Hana Golding / Robert Seder / Surender Khurana / David C Montefiori / Norbert Pardi / Drew Weissman / Ralph S Baric / Priyamvada Acharya / Barton F Haynes / Kevin O Saunders /
PubMed AbstractImmunization with mRNA or viral vectors encoding spike with diproline substitutions (S-2P) has provided protective immunity against severe COVID-19 disease. How immunization with Severe Acute ...Immunization with mRNA or viral vectors encoding spike with diproline substitutions (S-2P) has provided protective immunity against severe COVID-19 disease. How immunization with Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) spike elicits neutralizing antibodies (nAbs) against difficult-to-neutralize variants of concern (VOCs) remains an area of great interest. Here, we compare immunization of macaques with mRNA vaccines expressing ancestral spike either including or lacking diproline substitutions, and show the diproline substitutions were not required for protection against SARS-CoV-2 challenge or induction of broadly neutralizing B cell lineages. One group of nAbs elicited by the ancestral spike lacking diproline substitutions targeted the outer face of the receptor binding domain (RBD), neutralized all tested SARS-CoV-2 VOCs including Omicron XBB.1.5, but lacked cross-Sarbecovirus neutralization. Structural analysis showed that the macaque broad SARS-CoV-2 VOC nAbs bound to the same epitope as a human broad SARS-CoV-2 VOC nAb, DH1193. Vaccine-induced antibodies that targeted the RBD inner face neutralized multiple Sarbecoviruses, protected mice from bat CoV RsSHC014 challenge, but lacked Omicron variant neutralization. Thus, ancestral SARS-CoV-2 spike lacking proline substitutions encoded by nucleoside-modified mRNA can induce B cell lineages binding to distinct RBD sites that either broadly neutralize animal and human Sarbecoviruses or recent Omicron VOCs.
External linksbioRxiv / PubMed:38187726 / PubMed Central
MethodsEM (single particle)
Resolution3.77 Å
Structure data

27703

8dtk

EMDB-27703, PDB-8dtk:
Structure of RBD directed antibody DH1047 in complex with SARS-CoV-2 spike: Local refinement of RBD-Fab interace
Method: EM (single particle) / Resolution: 3.77 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

Source
  • severe acute respiratory syndrome coronavirus 2
  • homo sapiens (human)
KeywordsViral Protein/Immune System / RBD / Fab / Viral Protein / Viral Protein-Immune System Complex

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