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The BA.1 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant shows dominance over newer variants like BF.7. Molecular dynamics simulations reveal BA.1

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Area of Science:

  • Virology
  • Molecular Biology
  • Computational Biology

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants emerge due to mutations in the spike (S) protein, affecting transmissibility.
  • The Omicron (BA.1) variant has caused significant global health challenges, with newer subvariants like BF.7 showing potential for increased infectivity.
  • Understanding the structural and dynamic differences between SARS-CoV-2 variants is crucial for predicting their behavior and impact.

Purpose of the Study:

  • To comparatively analyze the structural, dynamic, and binding features of SARS-CoV-2 variants BA.1, BA.4/5, and BF.7.
  • To elucidate the molecular mechanisms underlying the dominance and transmissibility of different SARS-CoV-2 variants.
  • To provide insights into the continuous evolution and emergence of novel SARS-CoV-2 subvariants.

Main Methods:

  • All-atom molecular dynamics (MD) simulations were performed in triplicate for BA.1, BA.4/5, and BF.7 variants.
  • Comparative analysis included investigation of structural, dynamic, and binding properties.
  • Energetic analysis and assessment of physicochemical properties were conducted, with results compared to cryo-EM data and epidemiological information from GISAID.

Main Results:

  • Molecular dynamics simulations and energetic analysis indicated the dominance of the BA.1 variant over BA.4/5 and BF.7.
  • Sustained global prevalence of BA.1 supports the simulation findings regarding its superiority.
  • Simulation results were consistent with existing cryo-EM structural data and epidemiological surveillance.

Conclusions:

  • The BA.1 variant exhibits predominant structural, dynamic, and binding characteristics compared to BA.4/5 and BF.7.
  • These findings explain the sustained global prevalence of BA.1.
  • The inherent properties of BA.1 contribute to its propensity for generating numerous novel subvariants.