7DMU image
Entry Detail
PDB ID:
7DMU
Keywords:
Title:
Structure of SARS-CoV-2 spike receptor-binding domain complexed with high affinity ACE2 mutant 3N39
Biological Source:
PDB Version:
Deposition Date:
2020-12-07
Release Date:
2020-12-23
Method Details:
Experimental Method:
Resolution:
3.20 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 43
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Angiotensin-converting enzyme 2
Mutations:A25V,K26E,K31N,E35K,N64I,L79F,N90H
Chain IDs:A, C
Chain Length:606
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Spike protein S1
Chain IDs:B, D
Chain Length:218
Number of Molecules:2
Biological Source:Severe acute respiratory syndrome coronavirus 2
Primary Citation
Engineered ACE2 receptor therapy overcomes mutational escape of SARS-CoV-2.
Nat Commun 12 3802 3802 (2021)
PMID: 34155214 DOI: 10.1038/s41467-021-24013-y

Abstact

SARS-CoV-2 has mutated during the global pandemic leading to viral adaptation to medications and vaccinations. Here we describe an engineered human virus receptor, ACE2, by mutagenesis and screening for binding to the receptor binding domain (RBD). Three cycles of random mutagenesis and cell sorting achieved sub-nanomolar affinity to RBD. Our structural data show that the enhanced affinity comes from better hydrophobic packing and hydrogen-bonding geometry at the interface. Additional disulfide mutations caused the fixing of a closed ACE2 conformation to avoid off-target effects of protease activity, and also improved structural stability. Our engineered ACE2 neutralized SARS-CoV-2 at a 100-fold lower concentration than wild type; we also report that no escape mutants emerged in the co-incubation after 15 passages. Therapeutic administration of engineered ACE2 protected hamsters from SARS-CoV-2 infection, decreased lung virus titers and pathology. Our results provide evidence of a therapeutic potential of engineered ACE2.

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