National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
HHSN272201700060C
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
75N93019C00062
米国
引用
ジャーナル: Cell Rep / 年: 2021 タイトル: Structural mechanism of SARS-CoV-2 neutralization by two murine antibodies targeting the RBD. 著者: John M Errico / Haiyan Zhao / Rita E Chen / Zhuoming Liu / James Brett Case / Meisheng Ma / Aaron J Schmitz / Michael J Rau / James A J Fitzpatrick / Pei-Yong Shi / Michael S Diamond / Sean P ...著者: John M Errico / Haiyan Zhao / Rita E Chen / Zhuoming Liu / James Brett Case / Meisheng Ma / Aaron J Schmitz / Michael J Rau / James A J Fitzpatrick / Pei-Yong Shi / Michael S Diamond / Sean P J Whelan / Ali H Ellebedy / Daved H Fremont / 要旨: The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has necessitated the rapid development of antibody-based therapies and vaccines as countermeasures. Here, we use cryoelectron ...The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has necessitated the rapid development of antibody-based therapies and vaccines as countermeasures. Here, we use cryoelectron microscopy (cryo-EM) to characterize two protective anti-SARS-CoV-2 murine monoclonal antibodies (mAbs) in complex with the spike protein, revealing similarities between epitopes targeted by human and murine B cells. The more neutralizing mAb, 2B04, binds the receptor-binding motif (RBM) of the receptor-binding domain (RBD) and competes with angiotensin-converting enzyme 2 (ACE2). By contrast, 2H04 binds adjacent to the RBM and does not compete for ACE2 binding. Naturally occurring sequence variants of SARS-CoV-2 and corresponding neutralization escape variants selected in vitro map to our structurally defined epitopes, suggesting that SARS-CoV-2 might evade therapeutic antibodies with a limited set of mutations, underscoring the importance of combination mAb therapeutics. Finally, we show that 2B04 neutralizes SARS-CoV-2 infection by preventing ACE2 engagement, whereas 2H04 reduces host cell attachment without directly disrupting ACE2-RBM interactions, providing distinct inhibitory mechanisms used by RBD-specific mAbs.
全体 : Complex of SARS-CoV-2 Spike RBD with Fab fragment of monoclonal a...
全体
名称: Complex of SARS-CoV-2 Spike RBD with Fab fragment of monoclonal antibody 2H04
要素
複合体: Complex of SARS-CoV-2 Spike RBD with Fab fragment of monoclonal antibody 2H04
複合体: SARS-CoV-2 Spike RBD
タンパク質・ペプチド: Spike protein S1
複合体: Fab fragment of monoclonal antibody 2H04
タンパク質・ペプチド: 2H04 heavy chain
タンパク質・ペプチド: 2H04 light chain
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超分子 #1: Complex of SARS-CoV-2 Spike RBD with Fab fragment of monoclonal a...
超分子
名称: Complex of SARS-CoV-2 Spike RBD with Fab fragment of monoclonal antibody 2H04 タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Fab fragments generated by proteolytic cleavage of recombinantly expressed IgG