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SARS-CoV-2 D614G spike mutation increases entry efficiency with enhanced ACE2-binding affinity.

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The SARS-CoV-2 spike protein D614G mutation enhances virus cell entry by increasing ACE2 receptor affinity. This D614G variant maintains susceptibility to neutralization, highlighting the need for ongoing global surveillance.

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Area of Science:

  • Virology and Molecular Biology
  • Infectious Diseases
  • Structural Biology

Background:

  • The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is continuously mutating.
  • Mutations in the spike (S) protein, which mediates viral entry via ACE2 receptor binding and TMPRSS2 cleavage, are of particular interest.
  • The impact of naturally occurring S protein mutations on SARS-CoV-2 cell entry efficiency remains largely unknown.

Purpose of the Study:

  • To investigate how naturally occurring spike protein mutations affect SARS-CoV-2 cell entry.
  • To analyze the specific effects of the D614G mutation on viral entry, ACE2 binding, and neutralization susceptibility.

Main Methods:

  • Utilized SARS-CoV-2 S-pseudotyped lentivirus systems to assess cell entry.
  • Performed structural and binding analyses to understand the molecular mechanisms of S protein variants.
  • Evaluated neutralization susceptibility using antisera against prototypic coronaviruses.

Main Results:

  • Naturally occurring S protein mutations can either decrease or enhance SARS-CoV-2 cell entry.
  • The D614G S protein mutant demonstrated significantly higher cell entry compared to other variants and the original SARS-CoV S protein.
  • Structural and binding data confirmed that the D614G mutation enhances ACE2 receptor affinity.
  • The D614G mutation did not alter the susceptibility of the virus to neutralization by existing antisera.

Conclusions:

  • The D614G mutation enhances SARS-CoV-2 cell entry by increasing its affinity for the ACE2 receptor.
  • Despite increased entry efficiency, the D614G variant retains susceptibility to neutralization, suggesting conserved epitopes.
  • Further global surveillance is crucial to monitor the transmissibility and evolution of SARS-CoV-2 variants, including the D614G mutant.