E.Elavazhagan wrote:
Hai,
I am having the trouble to obtain the topology file while attaching the
prosthetic group to the target protein.Heme ion is surrounded by the
three aminoacids HIS243,ASP185,HIS183 which all are within 3 A'
distance.While I am using the G43a1 force filed ,the error is obtained
as "Residue 'FE' not found in residue topology database".On referring
the files FFG43a1,ions in
"C:\cygwin\usr\local\gromacs\share\gromacs\top" we found the presence of
FE with the mass details.
Yes, you'll probably have found some atom type info in the .atp file,
but the "residue topology database" is in the .rtp file. pdb2gmx
requires that all atoms belong to a residue in the .rtp file, and that
the structure file names the residue correctly and the atoms in that
residue in a manner consistent with the .rtp file. Thus at the very
least, you'll need to create a residue for the iron in the .rtp file.
Then you'll need to copy specbond.dat to your working directory, and
edit it to add the bonds to the iron.
On trying to get the top file from the DUNDEE
PRODRG server ,I faced the error as too many atoms in this molecule.It
will be more worthful if i come to know how to tackle this problem or
possible way to obtain the .top file information in any other specific
databases.
In general, nobody has done your problem before, so you have to do it
yourself. As far as I'm aware, the only automated tool is PRODRG and
that has its limitations.
Mark
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