milad ekramnia wrote:
Hi dear gromacs users
how can I insert molecules with more than 1 residue (like a multi-residue protein ) in my box beside the main one

By having a new [ moleculetype ]. The simplest way to do this is to take the secondary molecule and generate a .top file for it using your normal method (e.g. pdb2gmx). Then edit that .top file to become an .itp file (remove forcefield #include lines, [ default ] section, [ molecules ] section) and now you have an .itp file that you can #include into your original .top file. Obviously you still need the ordering of your [ molecules ] section to match that in your coordinate file.

Mark

and is there a way to set the distance between their Center of masses in the box ?
thanks  all
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