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Targeting the Spike Receptor Binding Domain Class V Cryptic Epitope by an Antibody with Pan-Sarbecovirus Activity

Journal Article · · Journal of Virology
DOI:https://doi.org/10.1128/jvi.01596-22· OSTI ID:2423689
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  1. Walter Reed Army Institute of Research, Silver Spring, MD (United States); Henry M. Jackson Foundation for the Advancement of Military Medicine (HJF), Inc., Bethesda, MD (United States)
  2. Henry M. Jackson Foundation for the Advancement of Military Medicine (HJF), Inc., Bethesda, MD (United States); Walter Reed Army Institute of Research, Silver Spring, MD (United States)
  3. Walter Reed Army Institute of Research, Silver Spring, MD (United States)
  4. Integral Molecular, Philadelphia, PA (United States)
  5. National Institutes of Health (NIH), Bethesda, MD (United States)
  6. Walter Reed Army Institute of Research, Silver Spring, Maryland, USA; Henry M. Jackson Foundation for the Advancement of Military Medicine (HJF), Inc., Bethesda, MD (United States)
Novel therapeutic monoclonal antibodies (MAbs) must accommodate comprehensive breadth of activity against diverse sarbecoviruses and high neutralization potency to overcome emerging variants. Here, in this study, we report the crystal structure of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) receptor binding domain (RBD) in complex with MAb WRAIR-2063, a moderate-potency neutralizing antibody with exceptional sarbecovirus breadth, that targets the highly conserved cryptic class V epitope. This epitope overlaps substantially with the spike protein N-terminal domain (NTD) -interacting region and is exposed only when the spike is in the open conformation, with one or more RBDs accessible. WRAIR-2063 binds the RBD of SARS-CoV-2 WA-1, all variants of concern (VoCs), and clade 1 to 4 sarbecoviruses with high affinity, demonstrating the conservation of this epitope and potential resiliency against variation. We compare structural features of additional class V antibodies with their reported neutralization capacity to further explore the utility of the class V epitope as a pan-sarbecovirus vaccine and therapeutic target.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); USDOD; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; W-31109-ENG-38
OSTI ID:
2423689
Journal Information:
Journal of Virology, Journal Name: Journal of Virology Journal Issue: 7 Vol. 97; ISSN 0022-538X; ISSN 1098-5514
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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