On Jun 20, 2009, at 15:30, "Ms. Aswathy S" <aswat...@amritapuri.amrita.edu > wrote:

using the g_confrm command the RMSD of the protein is 0 (Root mean square deviation after lsq fit = 4.14581e-08). It means the structure doesn't have a major change ultimately.. Please correct me if I am wrong..
You are correct.
Can I move ahead with this minimization?
However this value is really small, which suggests that the minimization did actually about nothing. This a bit too nothing!

Of I were you I would check that you actually used g_confrm the right way or indeed performed a minization.

Dept. Biotechnology
Ext. 3108

----- Original Message -----
From: "David van der Spoel" <sp...@xray.bmc.uu.se>
To: "Discussion list for GROMACS users" <gmx-users@gromacs.org>
Sent: Saturday, June 20, 2009 6:07:20 PM GMT +05:30 Chennai, Kolkata, Mumbai, New Delhi
Subject: Re: [gmx-users] Coordinates change after minimization

Justin A. Lemkul wrote:


Ms. Aswathy S wrote:
Hi,

After minimizing the protein -ligand complex, the co-ordinates have
changed
drastically.My idea about minimization was the coordinates will have
minute
changes only. In this case my protein is completely transferring to a new
co-ordinates.Is that reasonable.??

The amount of change will depend on the quality of the initial model.
If large changes need to be made, they can be. If the entire protein is
moving, then perhaps the box has not been prepared correctly, and the
translation is caused by a periodic jump.  Have a look at the output
(not just the coordinates) and see if you can deduce what's going on.

Try running g_confrms to see whether they really are very different.

-Justin


Thanks, Aswathy Dept. Biotechnology Ext. 3108
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David.
________________________________________________________________________


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