[gmx-users] Query on restraining center of mass of a protein

2011-11-14 Thread Sanku M
Hi,
  I have a system containing water and a large protein. In the simulation, I do 
not want the protein center of mass to drift away. I was wondering what will be 
the reasonable method in gromacs to fix the position of the center of mass of 
the protein in its original position . I was thinking about two options in 
gromacs.
  1) use the protein as comm-grp only to remove its center of mass motion . ( 
or should I use both protein and non-protein ( water) center of mass as 
comm-grps separately ).
  2) Finding the residue closest to center of mass of the protein ( but I am 
not sure how to do it ).
Can anyone suggest which will be a good idea ?

Sanku-- 
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Re: [gmx-users] Query on restraining center of mass of a protein

2011-11-14 Thread Mark Abraham

On 15/11/2011 10:21 AM, Sanku M wrote:

Hi,
  I have a system containing water and a large protein. In the 
simulation, I do not want the protein center of mass to drift away.


Why do you want it not to drift away? There's nothing magical about the 
center of a periodic simulation cell. Why do you want to change the 
dynamics to achieve this?


Mark

I was wondering what will be the reasonable method in gromacs to fix 
the position of the center of mass of the protein in its original 
position . I was thinking about two options in gromacs.
  1) use the protein as comm-grp only to remove its center of mass 
motion . ( or should I use both protein and non-protein ( water) 
center of mass as comm-grps separately ).
  2) Finding the residue closest to center of mass of the protein ( 
but I am not sure how to do it ).

Can anyone suggest which will be a good idea ?




-- 
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