Dear All,
I would like to ask for your help to my problem dealing with making topology
file for ligand with OPLS-AA forcefield by following
TutorialAcpypi4GromacsOPLS.
Now, let me show you my steps:
- Getting my ligand.pdb file from PDB
- Adding all hydrogen by PRODRG2.5 Server with GROMOS 87 forcefield, full
charges, no EM, full chirality
- Using antechamber to convert ligand.pdb to ligand_bcc.pdb
(antechamber -i ligand.pdb -fi pdb -o ligand_bcc.pdb -fo pdb -c bcc)
- Running ACPYPI (acpypi -i ligand_bcc.pdb), then obtaining folder
ligand_bcc.acpypi, including my wanted file: ligand_bcc_GMX_OPLS.itp.
However, some problems occured:
17 opls_x 1 MOL O24 17 -0.447600 0.00000 ; qtot
-0.186 x
22 opls_x 1 MOL C4 22 -0.147400 0.00000 ; qtot
-0.168 x
It seems that OPLS-AA forcefield does not recognize what Amber forcefield
have assigned for this atomtype/bondtype. Then, it stopped me there from
running the next steps in order to perform modeling dynamics simulation of
protein-ligand complex in Gromacs with OPLS-AA forcefield.
Could you please help me to solve this problem?
I really hope to hear from you soon!
Thanks in advances!
--
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