[gmx-users] Spherical Position Restrain from the center of the Box

[#ZHANG HAIPING#]

Dear gromacs user:

I plan to do a coarse grain simulation for a whole virus coat. It only contains virus surface protein, so I'm afraid it will collapse due to lack of inner member lipids.  I plan to add a Spherical Position Restrain from the center of the Box, to prevent the surface protein fall inside of the sphere, but allow the surface protein move outward. Can anyone tell me how to make such a position restrain in gromacs? Thanks a lot.


Best regards,

Haiping Zhang