Structures of Human Antibodies Bound to SARS-CoV-2 Spike Reveal Common Epitopes and Recurrent Features of Antibodies
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- California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology and Biological Engineering; OSTI
- California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Biology and Biological Engineering
- California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
- Rockefeller Univ., New York, NY (United States). Lab. of Molecular Immunology
- Rockefeller Univ., New York, NY (United States). Lab. of Retrovirology
- Rockefeller Univ., New York, NY (United States). Hospital Program Direction
- Rockefeller Univ., New York, NY (United States). Lab. of Retrovirology; Howard Hughes Medical Inst., Chevy Chase, MD (United States)
- Rockefeller Univ., New York, NY (United States). Lab. of Molecular Immunology; Universita della Svizzera italiana, Bellinzona (Switzerland). Inst. for Research in Biomedicine
- Rockefeller Univ., New York, NY (United States). Lab. of Molecular Immunology; Howard Hughes Medical Inst., Chevy Chase, MD (United States)
Neutralizing antibody responses to coronaviruses mainly target the receptor-binding domain (RBD) of the trimeric spike. Here, we characterized polyclonal immunoglobulin Gs (IgGs) and Fabs from COVID-19 convalescent individuals for recognition of coronavirus spikes. Plasma IgGs differed in their focus on RBD epitopes, recognition of alpha- and beta-coronaviruses, and contributions of avidity to increased binding/ neutralization of IgGs over Fabs. Using electron microscopy, we examined specificities of polyclonal plasma Fabs, revealing recognition of both S1A and RBD epitopes on SARS-CoV-2 spike. Moreover, a 3.4 Å cryoelectron microscopy (cryo-EM) structure of a neutralizing monoclonal Fab-spike complex revealed an epitope that blocks ACE2 receptor binding. Modeling based on these structures suggested different potentials for inter-spike crosslinking by IgGs on viruses, and characterized IgGs would not be affected by identified SARS-CoV-2 spike mutations. Overall, our studies structurally define a recurrent anti-SARS-CoV-2 antibody class derived from VH3-53/VH3-66 and similarity to a SARS-CoV VH3-30 antibody, providing criteria for evaluating vaccine-elicited antibodies.
- Sponsoring Organization:
- Bill and Melinda Gates Foundation; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1816377
- Journal Information:
- Cell, Journal Name: Cell Journal Issue: 4 Vol. 182; ISSN 0092-8674
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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