MM-GBSA and MM-PBSA for Gromacs 2020

GROMACS version: 2020.1
GROMACS modification: No

Hello all,

I am performing a protein-ligand simulation, and I would like to use MM-GBSA or MM-PBSA to perform free energy calculations. I know that there is the g_mmpbsa (https://rashmikumari.github.io/g_mmpbsa/) package available on GitHub, but it’s apparently incompatible with files in Gromacs-2020 (when I tried to use it, it gave me a clear error stating that I was trying to input files from version 113 [I think?] into a program whose version is 109).

Does anyone know of any alternative way of running MM-GBSA or MM-PBSA calculations on MD output files from Gromacs version 2020.1?

If there is no such way to do that, does anyone know of any other way to calculate free energy after the simulation is finished? (I have already finished my simulations, and I am hoping to not have to run them again.)

Thank you so much for your help,
Surya

Using the GMXPBSA scripts (https://github.com/aspitaleri/gmxpbsa) can be a good alternative.

Sandor