This may be the case. However if not, I suggest you use the PRODRG beta
server (top right hand corner on the main page) to produce output files
for a more appropriate forcefield.
I have generated and used files successfully using the beta server in
the ff43a1.
Cheers
Mitch
John E. Kerrigan wrote:
Hi Anna,
Your input files did not come through. However, it might be possible
you are using two different forcefields unintentionally? In the
tutorial, we use the gromacs forcefield (ffgmx or pdb2gmx -ff gmx).
Perhaps you have used a different forcefield? The prodrg site creates
ffgmx itp files. The prodrg beta site creates Gromos96 itp files. It's
easy to mix these up because the output is so similar.
John
Hi all,
I'm trying to simulate the MD of a protein with a ligand. Since it is the
first time, I followed exactly (at least, I think so!) suggestions from
"GROMACS tutorial for drug-enzyme complex" by J. Kerrigan. I started from
the PDB coordinates of the complex, I extracted the coordinates of the
ligand and created a .itp file for the ligand using the PRODRG server. Then
I submitted the protein alone to pdb2gmx, and then I manually edited the
.pdb and the .top files in order to re-introduce the coordinates of the
ligand into the protein. Therefore, I opened the .pdb file of the protein
created by pdb2gmx, and pasted the coordinates of the ligand obtained by
PRODRG (changing the n. of residue to continue numbering), and I edited the
.top file by adding #include "lig.itp" in the ff statement, LIG in the [
molecules ] section etc. Then I created the box with editconf, solvated it
with genbox and started grompp before neutralizing the -5 charge of the
protein with genion.
The grompp output gave me a fatal error:
Source code file: toputil.c, line 61
FATAL ERROR: ATOMTYPE 'CH3' NOT FOUND
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