[gmx-users] Using OPLSAA

[Ramesh Sistla]

Hello List!

I am a rank new user of gromacs. I could use the Drug-Enzyme complex 
tutorial and run the simulation given in that.

However, I am attempting to run it on protein of my choice now. Also I would 
like to use the OPLS ff. I am encountering a difficulty here. When I make 
the ligand .gro file using the PRODRG server at Dundee, I think the server 
uses Gromacs ff. Obviously when I incorporate this ligand .top file into my 
protein and use the .itp file thrown out by PRODRG, the program ends because 
of conflict where it says 'ATOM type O not found' or similar. I think the 
trouble is my topology file of the protein was created with opls where as 
that of logand was done with gmx. How do I overcome this difficulty? 

Thanks for your patient reading and any help.

Best Regards
Ramesh Sistla
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