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Open AccessJournal ArticleDOI

Antibody cocktail to SARS-CoV-2 spike protein prevents rapid mutational escape seen with individual antibodies.

TLDR
This work investigated the development of resistance against four antibodies to the spike protein that potently neutralize SARS-CoV-2, individually as well as when combined into cocktails.
Abstract
Antibodies targeting the spike protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) present a promising approach to combat the coronavirus disease 2019 (COVID-19) pandemic; however, concerns remain that mutations can yield antibody resistance. We investigated the development of resistance against four antibodies to the spike protein that potently neutralize SARS-CoV-2, individually as well as when combined into cocktails. These antibodies remain effective against spike variants that have arisen in the human population. However, novel spike mutants rapidly appeared after in vitro passaging in the presence of individual antibodies, resulting in loss of neutralization; such escape also occurred with combinations of antibodies binding diverse but overlapping regions of the spike protein. Escape mutants were not generated after treatment with a noncompeting antibody cocktail.

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SARS-COV-2 spike binding to ACE2 in living cells monitored by TR-FRET.

TL;DR: In this article, the authors developed an RBD-ACE2 binding assay that is based on time-resolved FRET, which reliably monitors the interaction in a physiologically relevant and cellular context.
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Enhanced virulence and waning vaccine-elicited antibodies account for breakthrough infections caused by SARS-CoV-2 delta and beyond

TL;DR: In this article , the authors investigated the factors responsible for SARS-CoV-2 breakthrough infections in a K18-hACE2 transgenic mouse model and found that enhanced virulence, greater immune evasion, and waning of vaccine-elicited protection account for the SARS CoV2 variants caused breakthrough infections.
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COVID-19 Clinical Trials Registered Worldwide for Drug Intervention: An Overview and Characteristic Analysis.

TL;DR: The designs of COVID-19 clinical drug trials have greatly improved in terms of the implementation of randomization and, particularly, blinding methods and the number of drug reuse, and hundreds of drugs have been used for efficacy screening.
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An antibody targeting the N-terminal domain of SARS-CoV-2 disrupts the spike trimer

TL;DR: Insight is provided about antibody targeting of the S protein trimer interface region, suggesting this region may be a site of virus vulnerability in SARS-CoV-2, and a rare human antibody, COV2-3434, is discovered.
References
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Journal ArticleDOI

Structural basis for the recognition of SARS-CoV-2 by full-length human ACE2.

TL;DR: Cryo–electron microscopy structures of full-length human ACE2 in the presence of the neutral amino acid transporter B0AT1 with or without the receptor binding domain (RBD) of the surface spike glycoprotein of SARS-CoV-2 are presented, providing important insights into the molecular basis for coronavirus recognition and infection.
Journal ArticleDOI

Structural and Functional Basis of SARS-CoV-2 Entry by Using Human ACE2.

TL;DR: The crystal structure of the C-terminal domain of SARS-CoV-2 (SARS- coV- 2-CTD) spike (S) protein in complex with human ACE2 (hACE2) is presented, which reveals a hACE2-binding mode similar overall to that observed for SARS -CoV.
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Cross-neutralization of SARS-CoV-2 by a human monoclonal SARS-CoV antibody.

TL;DR: Several monoclonal antibodies that target the S glycoprotein of SARS-CoV-2, which was identified from memory B cells of an individual who was infected with severe acute respiratory syndrome coronavirus (SARS- coV) in 2003, and one antibody (named S309) potently neutralization, which may limit the emergence of neutralization-escape mutants.
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