xianghong qi wrote:
Thanks, Mark. That means I can set energygrp_excl = Protein Protein, then I can get rid of those parameter which are related to electrostatics, Vdw( like rcoulomb, vdw-type, rvdw, rvdw-switch, etc). Am I right?

No. Section 7.3.19 indicates how this should be done. I think you want

energygrp_excl = Methane1 Methane2

so you will need to use make_ndx suitably to create these groups.

If "Protein" includes only your pair of methanes, then

energygrp_excl = Protein Protein

will have the same effect, only because there are no intramolecular nonbonded interactions in methane. It's thus not a generalizable solution...

Mark
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