B cell genomics behind cross-neutralization of SARS-CoV-2 variants and SARS-CoV

Cell. 2021 Jun 10;184(12):3205-3221.e24. doi: 10.1016/j.cell.2021.04.032. Epub 2021 Apr 24.

Abstract

Monoclonal antibodies (mAbs) are a focus in vaccine and therapeutic design to counteract severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its variants. Here, we combined B cell sorting with single-cell VDJ and RNA sequencing (RNA-seq) and mAb structures to characterize B cell responses against SARS-CoV-2. We show that the SARS-CoV-2-specific B cell repertoire consists of transcriptionally distinct B cell populations with cells producing potently neutralizing antibodies (nAbs) localized in two clusters that resemble memory and activated B cells. Cryo-electron microscopy structures of selected nAbs from these two clusters complexed with SARS-CoV-2 spike trimers show recognition of various receptor-binding domain (RBD) epitopes. One of these mAbs, BG10-19, locks the spike trimer in a closed conformation to potently neutralize SARS-CoV-2, the recently arising mutants B.1.1.7 and B.1.351, and SARS-CoV and cross-reacts with heterologous RBDs. Together, our results characterize transcriptional differences among SARS-CoV-2-specific B cells and uncover cross-neutralizing Ab targets that will inform immunogen and therapeutic design against coronaviruses.

Keywords: COVID-19; SARS-CoV cross-neutralization; cryo-electron microscopy; disordered CDRH3; memory B cells; monoclonal antibodies; single B cell genomics.

Publication types

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

MeSH terms

  • Antibodies, Monoclonal / chemistry
  • Antibodies, Monoclonal / immunology
  • Antibodies, Neutralizing / blood
  • Antibodies, Neutralizing / chemistry
  • Antibodies, Neutralizing / immunology*
  • Antibodies, Viral / blood
  • Antibodies, Viral / chemistry
  • Antibodies, Viral / immunology
  • Antigen-Antibody Complex / chemistry
  • Antigen-Antibody Complex / metabolism
  • Antigen-Antibody Reactions
  • B-Lymphocytes / cytology
  • B-Lymphocytes / metabolism*
  • B-Lymphocytes / virology
  • COVID-19 / pathology
  • COVID-19 / virology
  • Cryoelectron Microscopy
  • Crystallography, X-Ray
  • Gene Expression Profiling
  • Humans
  • Immunoglobulin A / immunology
  • Immunoglobulin Variable Region / chemistry
  • Immunoglobulin Variable Region / genetics
  • Protein Domains / immunology
  • Protein Multimerization
  • Protein Structure, Quaternary
  • SARS-CoV-2 / immunology*
  • SARS-CoV-2 / isolation & purification
  • SARS-CoV-2 / metabolism
  • Sequence Analysis, RNA
  • Spike Glycoprotein, Coronavirus / chemistry
  • Spike Glycoprotein, Coronavirus / genetics
  • Spike Glycoprotein, Coronavirus / immunology*
  • Spike Glycoprotein, Coronavirus / metabolism

Substances

  • Antibodies, Monoclonal
  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Antigen-Antibody Complex
  • Immunoglobulin A
  • Immunoglobulin Variable Region
  • Spike Glycoprotein, Coronavirus
  • spike protein, SARS-CoV-2