Summary 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 cryo-electron 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.
Structures of Human Antibodies Bound to SARS-CoV-2 Spike Reveal Common Epitopes and Recurrent Features of Antibodies
C. Barnes,A. West,Kathryn E Huey-Tubman,Magnus A. G. Hoffmann,N. G. Sharaf,Pauline R. Hoffman,Nicholas S Koranda,H. Gristick,C. Gaebler,Frauke Muecksch,J. C. Lorenzi,Shlomo Finkin,Thomas Hägglöf,A. Hurley,Katrina G. Millard,Y. Weisblum,F. Schmidt,T. Hatziioannou,P. Bieniasz,M. Caskey,D. Robbiani,M. Nussenzweig,P. Bjorkman
Published 2020 in Cell
ABSTRACT
PUBLICATION RECORD
- Publication year
2020
- Venue
Cell
- Publication date
2020-06-24
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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