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. 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.

Thanking You.
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