?????? wrote:
My problem is How to define new residue in GROMACS?

i have made a 3-d structure model for a protein based on a template 
protein??which has a heme group.

   befor runing the gromacs molecular simulation,i must define the heme group 
as a new residue,How to define new residue in GROMACS?

You need both suitable parameters for your desired forcefield, and then to construct a correct topology. The required formats are described in chapter 5 of the manual. You would be well advised to get some experience in how the work-flow operates by running normal simulations on simple proteins, e.g. in tutorials.

If you wish to use pdb2gmx to create the topology, you will need to modify the residue topology file (.rtp) to add the new residue. http://oldwiki.gromacs.org/index.php/specbond.dat may also need to be changed to link the heme group properly.

Mark
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