Using the pdb2gmx module, I separately parameterized two proteins (polymers), I used the topologies of both and joined them in a single topol.top file. I have minimized the energy and the gromacs preprocessor (grommp) does not warn about any error in the simulation, however when executing the mdrun module, in the last line I get the message: "WARNING: There are no atom pairs for dispersion correction"
Is this something to worry about or is it related to the gromacs 2020 version? If I have already taken steps to equilibrate the system, should they not be considered valid?
Have you checked that you set the dispersion correction in the md.mdp file to "no" (DispCorr = no) ?
Dispersion correction is not used for proteins with the C36 additive FF (CHARMM36)
It should be set to "no" in the nvt.mdp and npt.mdp files too!
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