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Molecular simulation with variable protonation states at constant pH.

Harry A Stern1

  • 1Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.

The Journal of Chemical Physics
|May 5, 2007
PubMed
Summary
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A novel Monte Carlo method enables molecular simulations at constant pH by integrating molecular dynamics. This approach accurately samples protonation states and conformations without continuum solvation models, improving simulations of titratable groups.

Area of Science:

  • Computational chemistry
  • Biophysics

Background:

  • Accurate molecular simulations require methods that can handle the dynamic nature of protonation states.
  • Existing methods often rely on continuum solvation models, which may not be suitable for all systems, especially buried titratable groups.

Purpose of the Study:

  • To introduce a new computational method for molecular simulations at constant pH.
  • To enable accurate sampling of protonation states and molecular conformations.

Main Methods:

  • A Monte Carlo procedure is employed, where trial moves involve short molecular dynamics trajectories.
  • A time-dependent potential energy function interpolates between protonation states during trial moves.
  • The method utilizes an explicit representation of water molecules, avoiding continuum solvation models.

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Main Results:

  • The method correctly samples conformations and protonation states from the appropriate statistical ensemble.
  • The length of molecular dynamics trajectories can be adjusted for optimal simulation efficiency.
  • Feasibility demonstrated through constant-pH simulations of acetic acid in aqueous solution.

Conclusions:

  • This new method offers a robust approach for molecular simulations at constant pH.
  • It is particularly useful for studying titratable groups, including those not exposed to solvent.
  • The method provides an accurate and efficient alternative to existing simulation techniques.