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SARS-CoV-2 Main Protease: A Molecular Dynamics Study.

Dimas Suárez1, Natalia Díaz1

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Molecular dynamics simulations reveal SARS-CoV-2 main protease flexibility. Dimerization and substrate binding impact active site accessibility and catalytic efficiency, offering insights into structure-activity relationships.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • The SARS-CoV-2 main protease (Mpro) is a critical target for antiviral therapies.
  • Understanding its structural dynamics and flexibility is essential for drug design.

Purpose of the Study:

  • To investigate the structure and flexibility of hydrated SARS-CoV-2 Mpro using molecular dynamics simulations.
  • To analyze the effects of substrate binding and dimerization on Mpro structure and catalytic activity.

Main Methods:

  • 2.0 μs molecular dynamics (MD) simulations in explicit solvent.
  • Electrostatic pKa calculations on X-ray structures.
  • Analysis of unbound and peptide-bound Mpro in monomeric and homodimeric forms.

Main Results:

  • Unbound monomeric Mpro shows unstable domain III orientation and interdomain motions.
  • Substrate binding stabilizes monomeric Mpro but orients the peptide unfavorably for catalysis.
  • Dimerization and substrate binding influence active site flexibility and catalytic impact.

Conclusions:

  • Computational results complement crystallographic data on SARS-CoV-2 Mpro.
  • Findings contribute to understanding structure-activity relationships for Mpro inhibitors.
  • MD simulations provide valuable insights into enzyme dynamics and substrate interactions.