A combination of cross-neutralizing antibodies synergizes to prevent SARS-CoV-2 and SARS-CoV pseudovirus infection

Cell Host Microbe. 2021 May 12;29(5):806-818.e6. doi: 10.1016/j.chom.2021.04.005. Epub 2021 Apr 15.

Abstract

Coronaviruses have caused several human epidemics and pandemics including the ongoing coronavirus disease 2019 (COVID-19). Prophylactic vaccines and therapeutic antibodies have already shown striking effectiveness against COVID-19. Nevertheless, concerns remain about antigenic drift in SARS-CoV-2 as well as threats from other sarbecoviruses. Cross-neutralizing antibodies to SARS-related viruses provide opportunities to address such concerns. Here, we report on crystal structures of a cross-neutralizing antibody, CV38-142, in complex with the receptor-binding domains from SARS-CoV-2 and SARS-CoV. Recognition of the N343 glycosylation site and water-mediated interactions facilitate cross-reactivity of CV38-142 to SARS-related viruses, allowing the antibody to accommodate antigenic variation in these viruses. CV38-142 synergizes with other cross-neutralizing antibodies, notably COVA1-16, to enhance neutralization of SARS-CoV and SARS-CoV-2, including circulating variants of concern B.1.1.7 and B.1.351. Overall, this study provides valuable information for vaccine and therapeutic design to address current and future antigenic drift in SARS-CoV-2 and to protect against zoonotic SARS-related coronaviruses.

Keywords: 3D structure; COVID-19; SARS-CoV-2; antibody cocktail; antibody-antigen interaction; coronavirus; cross-neutralizing antibody; crystallography; synergy.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiotensin-Converting Enzyme 2 / metabolism
  • Antibodies, Neutralizing / chemistry
  • Antibodies, Neutralizing / immunology*
  • Antibodies, Viral / chemistry
  • Antibodies, Viral / immunology*
  • COVID-19 / prevention & control*
  • Cross Reactions
  • Humans
  • SARS-CoV-2 / immunology*
  • Severe Acute Respiratory Syndrome / prevention & control*
  • Severe acute respiratory syndrome-related coronavirus / immunology*
  • Spike Glycoprotein, Coronavirus / metabolism

Substances

  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Spike Glycoprotein, Coronavirus
  • ACE2 protein, human
  • Angiotensin-Converting Enzyme 2