Abstract
A combination of classical molecular dynamics (MD) simulation and ab initio fragment molecular orbital (FMO) calculation was applied to a complex formed between the main protease of the new coronavirus and the inhibitor N3 to calculate interactions within the complex while incorporating structural fluctuations mimicking physiological conditions. Namely, a statistical evaluation of interaction energies between N3 and amino acid residues was performed by processing a thousand of structure samples. It was found that relative importance of each residue is altered by the structural fluctuation. The MD-FMO combination should be promising to simulate protein related systems in a more realistic way.
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