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Dissociation Rate Calculation via Constant-Force Steered Molecular Dynamics Simulation.

Shinji Iida1, Tomoshi Kameda1

  • 1Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-4-7 Aomi, Koto-ku, Tokyo 135-0064, Japan.

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Summary
This summary is machine-generated.

Constant-force steered molecular dynamics (CF-SMD) efficiently estimates molecular dissociation times. This method uses a constant pulling force to enhance dissociation events and accurately predicts equilibrium dissociation rates when combined with established models.

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics Simulations
  • Biophysics

Background:

  • Steered molecular dynamics (SMD) is crucial for studying molecular dissociation.
  • Traditional SMD uses constant-velocity pulling, which can be computationally intensive.
  • A modified approach, constant-force SMD (CF-SMD), offers a potentially more efficient alternative.

Purpose of the Study:

  • To introduce and validate the constant-force steered molecular dynamics (CF-SMD) simulation method.
  • To demonstrate the capability of CF-SMD in estimating equilibrium dissociation times.
  • To assess the computational efficiency and accuracy of CF-SMD for predicting dissociation rates.

Main Methods:

  • Implementation of CF-SMD simulations applying a constant force to molecules.
  • Conducting all-atom simulations for model systems like NaCl and protein-ligand complexes.
  • Extrapolation of dissociation times obtained at various forces to equilibrium conditions using Bell's and Dudko-Hummer-Szabo models.

Main Results:

  • CF-SMD simulations successfully generated dissociation times for various applied forces.
  • Extrapolation using Bell's or Dudko-Hummer-Szabo models allowed prediction of equilibrium dissociation rates.
  • The CF-SMD approach, combined with these models, accurately predicted dissociation times at equilibrium.

Conclusions:

  • CF-SMD is a powerful and computationally efficient tool for estimating molecular dissociation rates.
  • This method provides a direct and effective way to study dissociation events.
  • CF-SMD enhances dissociation events by reducing the activation barrier, facilitating analysis.