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Interaction Analysis on the SARS-CoV-2 Spike Protein Receptor Binding Domain Using Visualization of the Interfacial

Takeshi Ishikawa1, Hiroki Ozono1, Kazuki Akisawa2

  • 1Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, Kagoshima 890-0065, Japan.

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Visualization of Interfacial Electrostatic Complementarity (VIINEC) analyzes protein interactions. This method reveals electrostatic details of SARS-CoV-2 spike protein binding to ACE2 and a neutralizing antibody, aiding in understanding molecular recognition.

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Area of Science:

  • Structural biology
  • Computational chemistry
  • Immunology

Background:

  • Protein-protein interactions are crucial for biological processes.
  • Understanding these interactions is key to drug discovery and disease mechanisms.
  • The SARS-CoV-2 spike protein's interaction with ACE2 is central to viral entry.

Purpose of the Study:

  • To introduce and demonstrate the Visualization of Interfacial Electrostatic Complementarity (VIINEC) method.
  • To analyze the electrostatic interactions in the SARS-CoV-2 spike protein's receptor-binding domain (RBD) with ACE2 and a neutralizing antibody (B38).
  • To elucidate the role of specific residues, like E484, in protein-protein binding.

Main Methods:

  • Utilized the Visualization of Interfacial Electrostatic Complementarity (VIINEC) technique.
  • Calculated electrostatic potentials (ESP) using the ab initio fragment molecular orbital method.
  • Examined the molecular interactions at the protein-protein interface of RBD/ACE2 and RBD/B38 complexes.

Main Results:

  • VIINEC identified local electrostatic complementarity between RBD's E484 and ACE2.
  • A considerable repulsive electrostatic interaction was observed involving E484.
  • Significant differences in the electrostatic potential map were found between the RBD/ACE2 and RBD/B38 interfaces.

Conclusions:

  • VIINEC is an effective method for visualizing electrostatic complementarity in protein-protein interactions.
  • The E484 residue plays a complex role in the electrostatic interaction with ACE2.
  • Differences in electrostatic potential maps correlate with antibody specificity, offering insights into antibody-target recognition mechanisms.