7FG3 image
Entry Detail
PDB ID:
7FG3
EMDB ID:
Keywords:
Title:
Major cryo-EM structure of S protein trimer of SARS-CoV2 with K-874, composite map
Biological Source:
PDB Version:
Deposition Date:
2021-07-25
Release Date:
2021-09-29
Method Details:
Experimental Method:
Resolution:
3.90 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Spike glycoprotein
Chain IDs:A
Chain Length:1273
Number of Molecules:1
Biological Source:Severe acute respiratory syndrome coronavirus 2
Polymer Type:polypeptide(L)
Description:K-874A VHH
Chain IDs:B (auth: D)
Chain Length:132
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Nasal delivery of single-domain antibody improves symptoms of SARS-CoV-2 infection in an animal model.
Plos Pathog. 17 e1009542 e1009542 (2021)
PMID: 34648602 DOI: 10.1371/journal.ppat.1009542

Abstact

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that causes the disease COVID-19 can lead to serious symptoms, such as severe pneumonia, in the elderly and those with underlying medical conditions. While vaccines are now available, they do not work for everyone and therapeutic drugs are still needed, particularly for treating life-threatening conditions. Here, we showed nasal delivery of a new, unmodified camelid single-domain antibody (VHH), termed K-874A, effectively inhibited SARS-CoV-2 titers in infected lungs of Syrian hamsters without causing weight loss and cytokine induction. In vitro studies demonstrated that K-874A neutralized SARS-CoV-2 in both VeroE6/TMPRSS2 and human lung-derived alveolar organoid cells. Unlike other drug candidates, K-874A blocks viral membrane fusion rather than viral attachment. Cryo-electron microscopy revealed K-874A bound between the receptor binding domain and N-terminal domain of the virus S protein. Further, infected cells treated with K-874A produced fewer virus progeny that were less infective. We propose that direct administration of K-874A to the lung could be a new treatment for preventing the reinfection of amplified virus in COVID-19 patients.

Legend

Protein

Chemical

Disease

Primary Citation of related structures