GROMACS version: gromacs/2023-cuda11.6.2-cpu-nompi
GROMACS modification: Yes/No
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Hello, I am trying to build a system of gramicidin A (containing Formyl-valine and ethanolamine as residues) in a POPC lipid bilayer. I’d like to use the G54A7 force field for modeling my system. The G54A7.ff folder contains a popc.itp file that I tried to “#include” as suggested here, but I’m still getting an error saying:
Fatal error:
Residue ‘POPC’ not found in residue topology database
I could only find a lipid.rtp file in the CHARMM forcefield folder. However, I wish to stick to the G54A7 ff due to other reasons. Is there anyway I can model my system by using the popc.itp file alone? Where can I find/ How can I build the right lipid.rtp file for my system?
Thank you.