I am now preparing a ligand topology following GROMACS protein-ligand tutorial.
However, I have a large ligand (446 atoms).
$ wc -l my_ligand.pdb
446 my_ligand.pdb
And
$ head my_ligand.fix.mol2
@<TRIPOS>MOLECULE
my_ligand
717 726 0 0 0
SMALL
GASTEIGER
@<TRIPOS>ATOM
1 N 20.2110 -14.1580 4.4710 N.3 1 144_ligand -0.3199
2 H 20.9960 -14.3850 5.0530 H 1 144_ligand 0.1189
3 CA 19.8650 -12.7390 4.4190 C.3 1 144_ligand 0.0830
When I tried to upload my_ligand_fix.mol2
to CGenFF server, I noticed it the maximum number of atoms allowable is 384.
Note that my_ligand_fix.mol2
has gone through processing right up to sort_mol2_bonds.pl
output.
Is there a way to get around this?
Or what other alternative to CGenFF that I can use instead?
-Sca