thanks for reply.I want to perform simulation of popc membrane.
Steps which i have done are as follows:
1. download popc128a.pdb, popc.it,lipids.itp
(http://moose.bio.ucalgary.ca/index.php?page=Structures_and_Topologies)
2. download ffgmx_lipids files
3.convert POPC of .top & popc.itp into POP as in popc.gro
4. #include "ffgmx.itp"
#include "lipid.itp"
#include "popc.itp"
#include "ffgmxnb.itp"
#include "ffgmxbon.itp"
................ in my .top file.
Now when I perform
pdb2gmx -ff gmx -f popc128a.pdb -o popc.gro -p popc.top
it shows the error that"Residue 'POP' not found in residue topology database".
I think that's because of the fact that ffgmx.rtp do not
contain "POP" residue ,but it has DPPC residue.
Plz suggest how can i solve this problem.
thanks.
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