hazizian wrote:
Hi I want to do MD on a two-domain protein (Protein A, Protein B). After doning position restranit for 20 ps, the final structure separated. How could I keep these 2 domain close to each other during whole MD run.

Check that they're not separated because of a PBC artefact (try trjconv -compact or something). If the positions were really restrained, they can't actually have separated.

Mark
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