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Water properties from first principles: simulations by a general-purpose quantum mechanical polarizable force field
A G Donchev1, N G Galkin, A A Illarionov
1Algodign, LLC, Bolshaya Sadovaya 8-1, Moscow 123001, Russia.
Summary
A new quantum mechanical polarizable force field (QMPFF2) accurately simulates liquid water properties, including its unusual density changes with temperature. This advance aids biomolecular simulations in aqueous environments.
Area of Science:
- Computational chemistry
- Molecular dynamics
- Biophysics
Background:
- Accurate molecular simulations require reliable force fields.
- Existing force fields may not capture complex phenomena like water's anomalous density.
- A quantum mechanical polarizable force field (QMPFF) was previously developed.
Purpose of the Study:
- To introduce an improved quantum mechanical polarizable force field, QMPFF2.
- To validate QMPFF2's performance in simulating liquid water.
- To assess QMPFF2's suitability for biomolecular simulations.
Main Methods:
- Development of the QMPFF2 force field using high-level quantum mechanical data.
- Application of QMPFF2 to molecular dynamics simulations of liquid water.
- Comparison of simulation results with experimental thermodynamic and structural data.
Main Results:
- QMPFF2 simulations showed excellent agreement with experimental data for water.
- QMPFF2 accurately reproduced the anomalous temperature dependence of water density.
- QMPFF2 performed comparably to or better than specialized water potentials.
Conclusions:
- QMPFF2 is a robust ab initio force field for simulating water.
- The ability to simulate both organic molecules and water makes QMPFF2 valuable for biomolecular systems.
- QMPFF2 shows promise for simulations of proteins and protein-ligand interactions.