From: MIke S (vmd.namd_at_gmail.com)
Date: Mon Sep 01 2008 - 18:46:36 CDT
Thank you for the useful information Thomas.
I'm currently using the toplogy files from Alex Mackerell's website, which
appear to be for CHARMM version c31b1. Am I right in assuming that I'll
need to get a license for CHARMM to access the parameter and topology files
you were referring to, or are these files accessible through another
On Sat, Aug 30, 2008 at 8:08 PM, Thomas Gaillard <
> On Sat, Aug 30, 2008 at 06:24:20PM -0400, MIke S wrote :
> > Hello,
> > Could anyone suggest a way to create a protonated C-terminus for a
> > Do I need to create a new entry in the topology file based on existing
> > ones? If so any suggestions on the best approach?
> > I've noticed a similar unanswered post from a few years ago (
> > http://www.ks.uiuc.edu/Research/namd/mailing_list/namd-l/2980.html).
> > the following post suggested acetylating or methylating the terminus, but
> > would prefer to protonate the carboxyl group instead.
> > (http://www.ks.uiuc.edu/Research/namd/mailing_list/namd-l/7055.html)
> Hello Mike, what you are looking for has been added to CHARMM topology
> and parameter files since the c35a2 version :
> 2.12 Force Field Parameter Updates
> Developers : Alex D. MacKerell
> Email Address : alex_at_outerbanks.umaryland.edu
> Institution : University of Maryland, School of Pharmacy
> Date : December 31, 2007
> 3) Proteins: Neutral N- and C-terminal patches added: NNEU and CNEU.
> Dr. Thomas Gaillard
> Laboratoire de Biophysicochimie Moléculaire
> Institut de Chimie LC3 - UMR 7177
> Université Louis Pasteur
> 4 rue Blaise Pascal
> F-67000 Strasbourg
> phone: +33 (0)390 241 493
> fax: +33 (0)390 241 490
> mail: gaillard_at_chimie.u-strasbg.fr
> web: http://lbm.u-strasbg.fr/gaillard
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