Using restraint on the dye using radius of gyration value in namd

From: Life Sciences Inc (
Date: Mon Apr 02 2018 - 09:26:47 CDT

Hi All

I want to put restraints on the "cluster of the dye" embedded inside the
lipid bilayer according to the clustered dye radius of gyration value,
which I already have the total value of the radius of gyration at the
certain time frame. I want to place that particular value of the radius of
gyration using NAMD on the headgroups of the dye to start the simulation so
that my dye remains in clustered form throughout the simulation run can
anyone please tell me what would be the input file for the colvar related
to restraints according to the radius of gyration value?

Thank you

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