[gmx-users] make a rigid nanoparticle (internally freeze body while it can move as a rigid body )

[Samieegohar, Mohammadreza]

Hi
I need to make a rigid Gold nanoparticle to run a coarse grained simulation. my gold nanoparticle will penetrate in a lipid membrane
I have built the initial structure by Material studio. This nanoparticle must be a internally freeze body while it can move as a rigid body
My question is , how can I make a rigid particle in Gromacs ? the particle should move as whole body in all directions while all of the atoms are fix

Thanks