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An ACE2-Based Decoy Inhibitor Effectively Neutralizes SARS-CoV-2 Omicron BA.5 Variant.

Haoran Zhang1, Bing Hu2, Panjing Lv1

  • 1Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, China.

Viruses
|November 11, 2022
PubMed
Summary
This summary is machine-generated.

Kansetin, an ACE2 mimetic, effectively neutralizes the SARS-CoV-2 Omicron BA.5 variant. This protein antagonist demonstrates potent inhibition against the highly transmissible BA.5 sublineage, offering a promising therapeutic option.

Keywords:
ACE2Omicron BA.5SARS-CoV-2neutralization escapeprotein antagonist

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Area of Science:

  • Virology
  • Drug Discovery

Background:

  • The SARS-CoV-2 Omicron BA.5 sublineage exhibits increased transmissibility and immune evasion.
  • Existing monoclonal antibodies show reduced efficacy against BA.5, necessitating novel therapeutics.
  • Kansetin, previously identified as an ACE2 mimetic and SARS-CoV-2 antagonist, demonstrated broad neutralization against earlier variants.

Purpose of the Study:

  • To evaluate the efficacy of Kansetin against the SARS-CoV-2 Omicron BA.5 variant.
  • To confirm the hypothesis that Kansetin's ACE2-mimicking property retains neutralization activity against BA.5.

Main Methods:

  • Surface Plasmon Resonance (SPR) was used to assess Kansetin-Spike binding affinity.
  • Pseudovirus and live virus assays were employed to determine cell infection inhibition.
  • In vitro studies were conducted to measure dissociation constant (KD) and half maximal inhibitory concentration (IC50).

Main Results:

  • Kansetin demonstrated nanomolar to picomolar level binding affinity (KD) and inhibitory concentration (IC50) against the BA.5 sublineage.
  • The compound exhibited competent inhibition of cell infection mediated by the BA.5 variant.
  • SPR and cell-based assays confirmed Kansetin's potent antiviral activity.

Conclusions:

  • Kansetin is a promising therapeutic candidate for treating infections caused by the SARS-CoV-2 Omicron BA.5 variant.
  • Its ACE2-mimicking mechanism suggests potential efficacy against future SARS-CoV-2 sublineages.
  • Kansetin offers a potential broad-spectrum therapeutic strategy against evolving coronaviruses.