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7ru4

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The rapid spread of SARS-CoV-2 variants poses a constant threat of escape from monoclonal antibody and vaccine countermeasures. Mutations in the ACE2 receptor binding site on the surface S protein have been shown to disrupt antibody binding and prevent viral neutralization. Here, we used a directed evolution-based approach to engineer three neutralizing antibodies for enhanced binding to S protein. The engineered antibodies showed increased in vitro functional activity in terms of neutralization potency and/or breadth of neutralization against viral variants. Deep mutational scanning revealed that higher binding affinity reduces the total number of viral escape mutations. Studies in the Syrian hamster model showed two examples where the affinity-matured antibody provided superior protection compared to the parental antibody. These data suggest that monoclonal antibodies for antiviral indications would benefit from affinity maturation to reduce viral escape pathways and appropriate affinity maturation in vaccine immunization could help resist viral variation.
The rapid spread of SARS-CoV-2 variants poses a constant threat of escape from monoclonal antibody and vaccine countermeasures. Mutations in the ACE2 receptor binding site on the surface S protein have been shown to disrupt antibody binding and prevent viral neutralization. Here, we used a directed evolution-based approach to engineer three neutralizing antibodies for enhanced binding to S protein. The engineered antibodies showed increased in vitro functional activity in terms of neutralization potency and/or breadth of neutralization against viral variants. Deep mutational scanning revealed that higher binding affinity reduces the total number of viral escape mutations. Studies in the Syrian hamster model showed two examples where the affinity-matured antibody provided superior protection compared to the parental antibody. These data suggest that monoclonal antibodies for antiviral indications would benefit from affinity maturation to reduce viral escape pathways and appropriate affinity maturation in vaccine immunization could help resist viral variation.
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Engineering SARS-CoV-2 neutralizing antibodies for increased potency and reduced viral escape pathways.,Zhao F, Keating C, Ozorowski G, Shaabani N, Francino-Urdaniz IM, Barman S, Limbo O, Burns A, Zhou P, Ricciardi MJ, Woehl J, Tran Q, Turner HL, Peng L, Huang D, Nemazee D, Andrabi R, Sok D, Teijaro JR, Whitehead TA, Ward AB, Burton DR, Jardine JG iScience. 2022 Sep 16;25(9):104914. doi: 10.1016/j.isci.2022.104914. Epub 2022 , Aug 11. PMID:35971553<ref>PMID:35971553</ref>
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, PMID:35971553<ref>PMID:35971553</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

Current revision

CC6.33 IgG in complex with SARS-CoV-2-6P-Mut7 S protein (RBD/Fv local refinement)

PDB ID 7ru4

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