AMBER Archive (2006)

Subject: Re: AMBER: mm-pbsa

From: vorasit vongsutilers (vvorasit_at_yahoo.com)
Date: Fri Mar 17 2006 - 08:03:15 CST

Dr.Gohlke,
   
  Yes, they contain the same number of atom. Thank you.
   
  Vorasit

Holger Gohlke <gohlke_at_bioinformatik.uni-frankfurt.de> wrote:
  Am Donnerstag, 16. März 2006 16:34 schrieb vorasit vongsutilers:
> Dear Amber user,
>
> I'm trying to use mm-pbsa to calculate free energy of my modified
> oligonucleotides and so far I have no luck using this program. The problem
> happenned when it's try to make pdb by ambpdb. The following is the
> procedure that I used to make trajectory and topology files. Trajectory
> file
> - Strip water and ions by using ptraj. The original trajectory file is
> from molecular dynamic run by sander. Topology file
> - Make pdb by using ambpdb (topology file is the one that use in
> molecular dynamic + restart file that created from exact same molecular
> dynamic). At this step ambpdb worked fine. - Delete water and ions residues
> by using text editor. Save a new pdb without water/ions. - Load the pdb in
> xleap then save topology and coordinate files. (I tried using ambpdb to
> make pdb from these new file, it crashed down.)

>From the information you provide everything looks ok to me. However, that you
are not able to generate a pdb file at this step already indicates a problem
(and it is not astonishing that mm_pbsa "further down" also fails). As an
initial check - are the number of atoms in both the topology and coordinate
files you use here the same?

Best regards

Holger

>
> I placed trajectory and topology file in mm_pbsa tutorial folder. It can
> generate snapshots but when I started calculation, program stop and left
> the message. "/usr/local/amber8/exe/ambpdb -p ../test.top <
> ../01_GenerateSnapshots/test_rec.crd1 > tmp.pdb 2> /dev/null not
> succesfull"
>
> I'm sure that I put the right path for the files. I think something might
> wrong with my topology or/and snapshot files but really couldn't figure it
> out. Any suggestion would be appreciated. Thank you very much.
>
> Note - all process performed in Amber 8
>

                
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