MDPOW is a python package that automates the calculation of solvation free energies via molecular dynamics (MD) simulations. In particular, it facilitates the computation of partition coefficients. Currently implemented:

• water-octanol partition coefficient (P_OW)
• water-cyclohexane partition coefficient (P_CW)
• water-toluene partition coefficient (P_TW)

Calculations are performed with the Gromacs MD software package ¹. Currently, OPLS-AA, CHARMM/CGENFF, and AMBER/GAFF parameters are supported.

As input, the user only needs to provide a structure file (PDB or GRO) and a Gromacs ITP file containing the parametrization of the small molecule (e.g. from LigandBook or ParamChem).

• https://mdpow.readthedocs.io
• Tutorial : computing the octanol-water partition coefficient of benzene (uses the example files)

See INSTALL for detailed instructions. MDPOW currently supports and is tested with Python 3.8 to 3.10.

You will also need Gromacs (currently tested with versions 4.6.5, 2018, 2020, 2021, 2022, 2023 but 2016 and 2019 should also work).

If you want to install the development version, get the sources from GitHub (the development branch) :

git clone https://github.com/Becksteinlab/MDPOW.git

and Install from the checked out source:

pip install MDPOW/

(Note the trailing slash / to indicate the directory.)

MDPOW is open source and published under the GNU General Public License v3. Source code is available at https://github.com/Becksteinlab/MDPOW .

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