[gmx-users] about CG MD Position Constraint

[BIRD]

Dear All
i have a question about membrane protein position constraint in membrane
i want to do a self-assembly in a membrane with two proteins by CG-MD simulation, i want to constraint a protein in ‍
a position and another one free to move.
i want to constriant a protein in a position but could free rotate(i use freezegrps but it could not allow protein rotate).‍
so which command should do that ?‍
thank you
Cao
Nankai University  China‍