Bi-paratopic and multivalent VH domains block ACE2 binding and neutralize SARS-CoV-2.
Bi-paratopic and multivalent VH domains block ACE2 binding and neutralize SARS-CoV-2.
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DOI:
10.1038/s41589-020-00679-1
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发表时间:
2021-01
影响因子:
14.8
通讯作者:
Wells JA
中科院分区:
文献类型:
--
作者:
Bracken CJ;Lim SA;Solomon P;Rettko NJ;Nguyen DP;Zha BS;Schaefer K;Byrnes JR;Zhou J;Lui I;Liu J;Pance K;QCRG Structural Biology Consortium;Zhou XX;Leung KK;Wells JA
Neutralizing agents against SARS-CoV-2 are urgently needed for the treatment and prophylaxis of COVID-19. Here, we present a strategy to rapidly identify and assemble synthetic human variable heavy (VH) domains toward neutralizing epitopes. We constructed a VH-phage library and targeted the angiotensin-converting enzyme 2 (ACE2) binding interface of the SARS-CoV-2 Spike receptor-binding domain (Spike-RBD). Using a masked selection approach, we identified VH binders to two non-overlapping epitopes and further assembled these into multivalent and bi-paratopic formats. These VH constructs showed increased affinity to Spike (up to 600-fold) and neutralization potency (up to 1400-fold) on pseudotyped SARS-CoV-2 virus when compared to standalone VH domains. The most potent binder, a trivalent VH, neutralized authentic SARS-CoV-2 with half-maximal inhibitory concentration (IC50) of 4.0 nM (180 ng/mL). A cryo-EM structure of the trivalent VH bound to Spike shows each VH domain engaging an RBD at the ACE2 binding site, confirming our original design strategy.
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