gurpreet singh wrote:
Thanks Mark for your advice

I tried to run the simulation even by removing all the restraints as you told but the same problem was coming. In your second reply you asked me to check the topology file. I have a doubt in that, actually what are the things i should look at in the topology file. I have seen my topology file and the related .itp files also but i did not find anything unusual in that.


try
grompp -maxwarn 0


Following are the contents of my Topology file:

; Include forcefield parameters
#include "ffG43a1.itp"

; Include chain topologies
#include "aquapomut_grom_A.itp"
#include "aquapomut_grom_B.itp"

; Include water topology
#include "spce.itp"

#ifdef POSRES_WATER
; Position restraint for each water oxygen
[ position_restraints ]
;  i funct       fcx        fcy        fcz
   1    1       1000       1000       1000
#endif

; Include generic topology for ions
#include "ions.itp"

[ system ]
; Name
Protein in water

[ molecules ]
; Compound        #mols
Protein_A           1
Protein_B           1
SOL                71
CL-                 6
SOL             14825
~

As i told to last time that my protein is a dimer. so my question is this problem is becasue of some missing parameter required for realizing gromacs that its a dimeric protein?

with regards
Gurpreet

On 7/3/07, *Mark Abraham* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote:

     >  Hello Gromacs users:

    Please don't reply to another user's question with a change of topic and
    not change the subject line of your email. Not doing this means the
    people
    who might know the answer for you have no idea in advance what you're
    going to be asking, and might not bother reading. Best is to start
    with a
    new email, not a reply, and to use your subject line sensibly.

     > I am running a  dimeric protein simulation on Gromacs 3.3 using
    the force
     > filed G43a1.
     >
     >
     > For initially minimizing the hydrogen i did some small
    minimization and
     > equilibration in the vacuum by maintaining the restraints
     > then i added ions and water but in the very first minimization i
    m getting
     > the following error

    If you want to keep your credibility, when people have already made a
    suggestion about how to solve your problem, such as I did here
    http://www.gromacs.org/pipermail/gmx-users/2007-June/028301.html,
    when you
    post the same problem, you should say what happened when you tried their
    suggestion. They didn't suggest it for their own entertainment.

    Look at the minimization "trajectory" and see where things are breaking.
    Have a look at your topology there, read chapter five thoroughly.

    Mark

    _______________________________________________
    gmx-users mailing list    gmx-users@gromacs.org
    <mailto:gmx-users@gromacs.org>
    http://www.gromacs.org/mailman/listinfo/gmx-users
    Please search the archive at http://www.gromacs.org/search before
    posting!
    Please don't post (un)subscribe requests to the list. Use the
    www interface or send it to [EMAIL PROTECTED]
    <mailto:[EMAIL PROTECTED]>.
    Can't post? Read http://www.gromacs.org/mailing_lists/users.php



------------------------------------------------------------------------

_______________________________________________
gmx-users mailing list    gmx-users@gromacs.org
http://www.gromacs.org/mailman/listinfo/gmx-users
Please search the archive at http://www.gromacs.org/search before posting!
Please don't post (un)subscribe requests to the list. Use the www interface or send it to [EMAIL PROTECTED]
Can't post? Read http://www.gromacs.org/mailing_lists/users.php


--
David van der Spoel, Ph.D.
Molec. Biophys. group, Dept. of Cell & Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205. Fax: +4618511755.
[EMAIL PROTECTED]       [EMAIL PROTECTED]   http://folding.bmc.uu.se
_______________________________________________
gmx-users mailing list    gmx-users@gromacs.org
http://www.gromacs.org/mailman/listinfo/gmx-users
Please search the archive at http://www.gromacs.org/search before posting!
Please don't post (un)subscribe requests to the list. Use the www interface or send it to [EMAIL PROTECTED]
Can't post? Read http://www.gromacs.org/mailing_lists/users.php

Reply via email to