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Accuracy of TIP4P/2005 and SPC/Fw Water Models.

João V L Valle1, Bruno H S Mendonça2, Marcia C Barbosa3

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Choosing the right water model is crucial for studying bioorganic molecules. Rigid water models like TIP4P/2005 generally offer better accuracy for bulk water properties than flexible models, except for supercooled water viscosity and dielectric constant.

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Area of Science:

  • Computational chemistry
  • Biophysics
  • Physical chemistry

Background:

  • Water is the primary solvent for bioorganic molecules in cellular environments.
  • Accurate water models are essential for simulating biophysical and biochemical processes.
  • The choice of water force field significantly impacts simulation outcomes.

Purpose of the Study:

  • To compare the accuracy of rigid (TIP4P/2005) and flexible (SPC/Fw) water models.
  • To evaluate the effect of intramolecular interactions on calculated bulk water properties.
  • To assess model performance across a temperature range of 250–370 K.

Main Methods:

  • Molecular dynamics simulations were performed using two distinct water force fields: TIP4P/2005 (rigid) and SPC/Fw (flexible).
  • Key bulk water properties were calculated: density, thermal expansion coefficient, self-diffusion coefficients, shear viscosity, radial distribution functions, and dielectric constant.
  • Simulation results were compared against experimental data.

Main Results:

  • The rigid TIP4P/2005 model showed smaller deviations from experimental data for most calculated properties.
  • The flexible SPC/Fw model provided better agreement with experimental results for the shear viscosity of supercooled water.
  • The flexible model also exhibited superior accuracy for the dielectric constant of water.

Conclusions:

  • Rigid water models generally offer higher accuracy for bulk water properties in simulations of bioorganic systems.
  • Flexible water models may be preferable when accurately simulating supercooled water viscosity or dielectric properties.
  • The selection of a water model should consider the specific properties and conditions relevant to the biophysical system under investigation.