7FDG image
Deposition Date 2021-07-16
Release Date 2021-08-25
Last Version Date 2025-07-02
Entry Detail
PDB ID:
7FDG
Keywords:
Title:
SARS-COV-2 Spike RBDMACSp6 binding to hACE2
Biological Source:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.69 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Angiotensin-converting enzyme 2
Gene (Uniprot):ACE2
Chain IDs:A
Chain Length:621
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Spike protein S1
Gene (Uniprot):S
Mutations:N501Y
Chain IDs:B (auth: E)
Chain Length:213
Number of Molecules:1
Biological Source:Severe acute respiratory syndrome coronavirus 2
Ligand Molecules
Primary Citation
Characterization and structural basis of a lethal mouse-adapted SARS-CoV-2.
Nat Commun 12 5654 5654 (2021)
PMID: 34580297 DOI: 10.1038/s41467-021-25903-x

Abstact

There is an urgent need for animal models to study SARS-CoV-2 pathogenicity. Here, we generate and characterize a novel mouse-adapted SARS-CoV-2 strain, MASCp36, that causes severe respiratory symptoms, and mortality. Our model exhibits age- and gender-related mortality akin to severe COVID-19. Deep sequencing identified three amino acid substitutions, N501Y, Q493H, and K417N, at the receptor binding domain (RBD) of MASCp36, during in vivo passaging. All three RBD mutations significantly enhance binding affinity to its endogenous receptor, ACE2. Cryo-electron microscopy analysis of human ACE2 (hACE2), or mouse ACE2 (mACE2), in complex with the RBD of MASCp36, at 3.1 to 3.7 Å resolution, reveals the molecular basis for the receptor-binding switch. N501Y and Q493H enhance the binding affinity to hACE2, whereas triple mutations at N501Y/Q493H/K417N decrease affinity and reduce infectivity of MASCp36. Our study provides a platform for studying SARS-CoV-2 pathogenesis, and unveils the molecular mechanism for its rapid adaptation and evolution.

Legend

Protein

Chemical

Disease

Primary Citation of related structures