Cited by 1,599SARS-CoV-2 and COVID-19 Researchvaccines and immunoinformatics approachesMonoclonal and Polyclonal Antibodies Research

SARS-CoV-2 neutralizing antibody structures inform therapeutic strategies

Open access
Barnes, Christopher O., Jette, Claudia A., Abernathy, Morgan E., Dam, Kim-Marie A., Esswein, Shannon R., Gristick, Harry B., Malyutin, Andrey G., Sharaf, Naima G. +6 more·2020·Nature

Published version of a preprint

Abstract

The coronavirus disease 2019 (COVID-19) pandemic presents an urgent health crisis. Human neutralizing antibodies that target the host ACE2 receptor-binding domain (RBD) of the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) spike protein 1-5 show promise therapeutically and are being evaluated clinically 6-8. Here, to identify the structural correlates of SARS-CoV-2 neutralization, we solved eight new structures of distinct COVID-19 human neutralizing antibodies 5 in complex with the SARS-CoV-2 spike trimer or RBD. Structural comparisons allowed us to classify the antibodies into categories: (1) neutralizing antibodies encoded by the VH3-53 gene segment with short CDRH3 loops that block ACE2 and bind only to 'up' RBDs; (2) ACE2-blocking neutralizing antibodies that bind both up and 'down' RBDs and can contact adjacent RBDs; (3) neutralizing antibodies that bind outside the ACE2 site and recognize both up and down RBDs; and (4) previously described antibodies that do not block ACE2 and bind only to up RBDs 9. Class 2 contained four neutralizing antibodies with epitopes that bridged RBDs, including a VH3-53 antibody that used a long CDRH3 with a hydrophobic tip to bridge between adjacent down RBDs, thereby locking the spike into a closed conformation. Epitope and paratope mapping revealed few interactions with host-derived N-glycans and minor contributions of antibody somatic hypermutations to epitope contacts. Affinity measurements and mapping of naturally occurring and in vitro-selected spike mutants in 3D provided insight into the potential for SARS-CoV-2 to escape from antibodies elicited during infection or delivered therapeutically. These classifications and structural analyses provide rules for assigning current and future human RBD-targeting antibodies into classes, evaluating avidity effects and suggesting combinations for clinical use, and provide insight into immune responses against SARS-CoV-2.

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  • The T478K mutation in the RBD is unique to the Delta variant and falls within the epitope region of potent neutralizing monoclonal antibodies categorized as 'Class1'.

    “The T478K mutation in the RBD is unique to the Delta variant and falls within the epitope region of potent neutralizing monoclonal antibodies categorized as 'Class1' 17”

    From Reduced sensitivity of SARS-CoV-2 variant Delta to antibody neutralization (2021) · cites this paper as [17]

    The Abstract describes the antibodies studied as highly potent, and the section on VH3-53/short CDRH3 antibodies identifies class 1 antibodies and their RBD epitopes (page unavailable). But the passages do not identify T478K as unique to Delta or establish that residue 478 falls within a class 1 epitope; searches for T478K and T478 did not resolve those points. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Plasma neutralizing activity directly correlated with anti-S and anti-RBD binding titers in ELISAs.

    “As expected, plasma neutralizing activity was directly correlated to anti-S and -RBD binding titers in ELISAs7,8 (Fig. 1c, d, and Extended Data Fig. 2a–d).”
  • In vaccine recipients, the ability of plasma to neutralize virus and the proportion of memory B cells specific for RBD matched those seen in people who had recovered from natural infection.

    “Moreover, the plasma neutralizing activity, and the relative numbers of RBD-specific memory B cells were equivalent to individuals who recovered from natural infection7,8.”
  • Antibody levels from plasma cells decline with time, yet durable immune memory can remain in expanded memory B cell clones.

    “Although circulating antibodies derived from plasma cells wane over time, long-lived immune memory can persist in expanded clones of memory B cells7,20.”
  • Nine of the 17 strongest antibodies lost at least ten-fold potency against pseudoviruses with E484K.

    “As seen in natural infection, a majority of the antibodies tested (9/17) were at least ten-fold less effective against pseudotyped viruses carrying the E484K mutation7,12,29.”

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Authors
Barnes, C. O., Jette, C. A., Abernathy, M. E., Dam, K.-M. A., Esswein, S. R., Gristick, H. B., Malyutin, A. G., Sharaf, N. G., Huey-Tubman, K. E., Lee, Y. E., Robbiani, D. F., Nussenzweig, M. C., West, A. P., & Bjorkman, P. J.
Affiliations
  • California Institute of Technology (US)
  • Institute for Research in Biomedicine (CH)
  • Howard Hughes Medical Institute (US)
Venue
Nature
Published
2020-10-12
Volume
588
Issue
7839
Pages
682-687
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W3092403777
Cited by
1,599
References
70
Citations by year
2026: 94 · 2025: 121 · 2024: 181 · 2023: 267 · 2022: 448 · 2021: 440 · 2020: 35 · 2018: 1 · 2017: 1 · 2015: 1 · 2014: 2 · 2013: 1
FWCI
39.08
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • PubMed Central (submittedVersion, cc-by-nc-nd)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion, cc-by-nc-nd)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • U.S. Department of Energy (P41GM103393, DE-AC02-)
  • Burroughs Wellcome Fund
  • George Mason University
  • California Institute of Technology
  • Wellcome Trust
  • National Institutes of Health (AI138938, P01 AI138938-S1, AI150464)
  • Office of Science (P41GM103393, DE-AC02)
  • Beckman Institute, California Institute of Technology
  • National Institute of General Medical Sciences (AI150464, P41GM103393)
  • National Institute of Allergy and Infectious Diseases (P50AI150464, F30AI147579, P01AI138938)
  • Basic Energy Sciences (DE-AC02, P41GM103393)
  • Biological and Environmental Research (P41 GM103393)
  • SLAC National Accelerator Laboratory (P41GM103393)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › vaccines and immunoinformatics approaches
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
Keywords
SARS-CoV-2, COVID-19 pandemic, neutralizing antibodies, spike protein receptor-binding domain, antibody-antigen complex structure, ACE2 receptor, epitope mapping, N-glycans, somatic hypermutation, antibody escape, avidity, antibody combination therapy, spike trimer

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