[gmx-users] About rotational restraint

[Lee Soin]

Hi!

I'm applying COM pull on a two-domain protein by fixing the distance between
the centers of mass of each domain with an umbrella potential. However, I
find that the domains can rotate so that the inner surfaces of each domain
are not parallel any more. How can I apply a rotational restraint so that
each domain doesn't rotate during simulation? Thanks in advance.

-- 
SUN Li
Department of Physics
Nanjing University, China
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