Self-assembling nanoparticles presenting receptor binding domain and stabilized spike as next-generation COVID-19 vaccines.

BioRxiv : the Preprint Server for Biology
Linling HeJiang Zhu

Abstract

We present a comprehensive vaccine strategy for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by combining antigen optimization and nanoparticle display. We first developed a receptor binding domain (RBD)-specific antibody column for purification and displayed the RBD on self-assembling protein nanoparticles (SApNPs) using the SpyTag/SpyCatcher system. We then identified the heptad repeat 2 (HR2) stalk as a major cause of spike metastability, designed an HR2-deleted glycine-capped spike (S2GΔHR2), and displayed S2GΔHR2 on three SApNPs with high yield, purity, and antigenicity. Compared to the RBD, the RBD-ferritin SApNP elicited a more potent murine neutralizing antibody (NAb) response on par with the spike. S2GΔHR2 elicited two-fold-higher NAb titers than the proline-capped spike (S2P), while S2GΔHR2 SApNPs derived from multilayered E2p and I3-01v9 60-mers elicited up to 10-fold higher NAb titers. The S2GΔHR2-presenting I3-01v9 SApNP also induced critically needed T-cell immunity, thereby providing a next-generation vaccine candidate to battle the COVID-19 pandemic. The receptor binding domain and stabilized SARS-CoV-2 spike were displayed on nanoparticles as vaccine antigens and elicited potent immune responses.

Citations

Feb 2, 2021·International Journal of Nanomedicine·Sree Pooja VarahachalamAjeet Kaushik

Datasets Mentioned

BETA
MN908947

Methods Mentioned

BETA
x-ray crystallography
size-exclusion chromatography
electrophoresis
enzyme-linked immunosorbent assay
ELISA
biolayer interferometry
transfection
flow cytometry
Biosensors
biosensor

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