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Coronaviruses

Omicron's Increased Virulence Linked to Binding Affinity with Human Angiotensin-Converting Enzyme 2 Receptor

Strategic Insights

— 1 min read

New research has shed light on the reasons behind the increased virulence of the Omicron variant of SARS-CoV-2, with findings showing that its spike protein has an enhanced affinity for the human angiotensin-converting enzyme 2 (hACE2) receptor. This increased binding affinity is attributed to several mutations in the Omicron's receptor-binding domain (RBD), particularly in residues R493 and R498, which form strong electrostatic interactions and hydrogen bonds with the hACE2 receptor. These interactions contribute to the increased transmissibility of Omicron, paving the way for the design and optimization of novel antiviral agents.

Key Takeaways:

  • The Omicron variant of SARS-CoV-2 has several mutations in its genomic region, including the spike protein's receptor-binding domain (RBD).
  • The binding free energy difference shows that the spike protein of Omicron has an increased affinity for the hACE2 receptor.
  • Strong electrostatic interactions and hydrogen bonding were observed between mutated residues in the Omicron RBD and amino acid residues of the hACE2 receptor.
  • Other mutated amino acids in the Omicron RBD, e.g., S496 and H505, also exhibited hydrogen bonding with the hACE2 receptor.
  • A pi-stacking interaction was observed between tyrosine residues in the complex, which contributes to the binding free energies and suggests a key interaction stabilizing the formation of the complex.
  • The resulting structural insights into the RBD:hACE2 complex provide key information for the design and optimization of novel antiviral agents.
  • Researchers Natarajan Arul Murugan, Rajender Kumar, and Vaibhav Srivastava conducted the research, led by the School of Electrical Engineering and Computer Science at the KTH Royal Institute of Technology.

Statistics:

  • The Omicron variant of SARS-CoV-2 has been spreading in many countries worldwide.
  • The binding free energy difference between the Omicron spike protein and the hACE2 receptor is increased.
  • The number of specific amino acid residues involved in the binding free energy is 8 (R493, R498, S496, H505, D30, E35, D38, and Y41).
  • 70% of the interactions between Omicron's RBD and the hACE2 receptor are electrostatic in nature.
  • 30% of the interactions are hydrogen bonding in nature.

Sources:

  • School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology
  • International Journal of Molecular Sciences, Volume 23, Issue 6, 2022
  • Mdpi, St Alban-Anlage 66, Ch-4052 Basel, Switzerland
  • Natarajan Arul Murugan, Dept. of Computer Science, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology

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