7U0A image
Deposition Date 2022-02-17
Release Date 2022-08-03
Last Version Date 2024-11-13
Entry Detail
PDB ID:
7U0A
Title:
Crystal Structure of C77G12 Fab in complex with SARS-CoV-2 S fusion peptide
Biological Source:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.18
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:SARS-CoV-2 S fusion peptide
Chain IDs:A
Chain Length:14
Number of Molecules:1
Biological Source: Severe acute respiratory syndrome coronavirus 2
Polymer Type:polypeptide(L)
Molecule:Heavy chain Fab C77G12
Chain IDs:B (auth: H)
Chain Length:225
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Light chain Fab C77G12
Chain IDs:C (auth: L)
Chain Length:214
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation

Abstact

The coronavirus spike glycoprotein attaches to host receptors and mediates viral fusion. Using a broad screening approach, we isolated seven monoclonal antibodies (mAbs) that bind to all human-infecting coronavirus spike proteins from severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immune donors. These mAbs recognize the fusion peptide and acquire affinity and breadth through somatic mutations. Despite targeting a conserved motif, only some mAbs show broad neutralizing activity in vitro against alpha- and betacoronaviruses, including animal coronaviruses WIV-1 and PDF-2180. Two selected mAbs also neutralize Omicron BA.1 and BA.2 authentic viruses and reduce viral burden and pathology in vivo. Structural and functional analyses showed that the fusion peptide-specific mAbs bound with different modalities to a cryptic epitope hidden in prefusion stabilized spike, which became exposed upon binding of angiotensin-converting enzyme 2 (ACE2) or ACE2-mimicking mAbs.

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