From: Sridhar Vaddadi (Sridhar.Vaddadi_at_utsa.edu)
Date: Wed Sep 23 2009 - 17:37:20 CDT
Thank you.........If permits can you look into my other email.
From: Ramya Gamini [mailto:ramyabhargavi_at_gmail.com]
Sent: Wed 9/23/2009 5:17 PM
To: Sridhar Vaddadi
Subject: Re: namd-l: topology files
A good site to look into would be
You will find simple tutorials to get you started with NAMD. Also, you will find the required topology and parameter files for protein systems in any of the tutorial files that come along with the tutorials.
On Wed, Sep 23, 2009 at 1:59 PM, Sridhar Vaddadi <Sridhar.Vaddadi_at_utsa.edu> wrote:
I am new to NAMD. I am trying to run NAMD on HIS-ARG dipeptide. When I am trying to generate psf file, it is asking for topology file. I downloaded topology files from http://mackerell.umaryland.edu/CHARMM_ff_params.html. In this webpage I found,
Toppar files with c35b2, c36a2 release of CHARMM.
what does c35b2 and c36a2 indicate and how do I choose what file I required for my calculation.
Any suggestions are really appreciated.
From: owner-namd-l_at_ks.uiuc.edu on behalf of Sridhar Vaddadi
Sent: Wed 9/23/2009 11:23 AM
Subject: namd-l: help requested
I am planning to run a NAMD simulation on HIS-ARG peptide. I have XYZ coordinates of this system. Can any one suggest how to generate pdb and psf files from this XYZ system. Is, VMD a good help to do this. Your suggestions are really appreciated.
From: owner-namd-l_at_ks.uiuc.edu on behalf of Rick Calloway
Sent: Tue 9/22/2009 12:08 PM
Subject: namd-l: Precision of Coordinate data
Can someone help me better understand the precision of the output coordinate data.
I am looking for statistically significant movement of the center of mass of a large molecule. Using VMD's measure center command returns angstroms out to 15 decimal places and looks quite tempting.
If the last 12 or so decimal places had meaning I could significantly reduce the runtime for my system.
How can I determine how many of these digits are significant?
Thank you in advance.
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