Abstract
Prevention of viral escape and increased coverage against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern require therapeutic monoclonal antibodies (mAbs) targeting multiple sites of vulnerability on the coronavirus spike glycoprotein. Here we identify several potent neutralizing antibodies directed against either the N-terminal domain (NTD) or the receptor-binding domain (RBD) of the spike protein. Administered in combinations, these mAbs provided low-dose protection against SARS-CoV-2 infection in the K18-human angiotensin-converting enzyme 2 mouse model, using both neutralization and Fc effector antibody functions. The RBD mAb WRAIR-2125, which targets residue F486 through a unique heavy-chain and light-chain pairing, demonstrated potent neutralizing activity against all major SARS-CoV-2 variants of concern. In combination with NTD and other RBD mAbs, WRAIR-2125 also prevented viral escape. These data demonstrate that NTD/RBD mAb combinations confer potent protection, likely leveraging complementary mechanisms of viral inactivation and clearance.
© 2021. The Author(s).
Publication types
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Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amino Acid Sequence
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Animals
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Antibodies, Monoclonal / administration & dosage
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Antibodies, Monoclonal / immunology*
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Antibodies, Monoclonal / metabolism
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Antibodies, Neutralizing / chemistry
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Antibodies, Neutralizing / immunology*
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Antibodies, Neutralizing / metabolism
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Antibodies, Viral / immunology
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Antibodies, Viral / metabolism
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Binding Sites / genetics
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COVID-19 / immunology*
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COVID-19 / metabolism
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COVID-19 / prevention & control
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Disease Models, Animal
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Dose-Response Relationship, Drug
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Epitope Mapping
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Epitopes / chemistry
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Epitopes / immunology
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Epitopes / metabolism
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Humans
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Mice, Transgenic
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Neutralization Tests
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Protein Binding
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Protein Conformation
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SARS-CoV-2 / genetics
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SARS-CoV-2 / immunology*
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SARS-CoV-2 / metabolism
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Sequence Homology, Amino Acid
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Spike Glycoprotein, Coronavirus / genetics
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Spike Glycoprotein, Coronavirus / immunology*
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Spike Glycoprotein, Coronavirus / metabolism
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Survival Analysis
Substances
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Antibodies, Monoclonal
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Antibodies, Neutralizing
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Antibodies, Viral
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Epitopes
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Spike Glycoprotein, Coronavirus