Difference between revisions of "DOCK Denovo Run"
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== Running Denovo == | == Running Denovo == | ||
| − | We can | + | We can now run a Denovo calculation! Rejoice! |
Revision as of 12:46, 17 November 2016
Contents
Dock Denovo Run
The Denovo module of DOCK is a relatively new feature (as of Fall 2016) that constructs new ligand molecules inside a protein active site from a library of user-specified "fragments". These fragments are common chemical functional groups, or building blocks, that are typically selected from a ZINC library of millions of compounds based off of their frequency of appearance. These fragments are classified as scaffolds, linkers, or side chains, according to the number of atomic positions that are permitted to seed growth: 3, 2, and 1 atoms, respectively. Thus, a scaffold could seed growth on three different atoms, having three linkers bonded to each position, and a linker could seed growth on two positions, and a side-chain on one position.
Once the molecules are built within the active site, their interactions with the protein are scored using the user-specified method of scoring. This tutorial will walk through the steps needed to run a Denovo calculation on the Beta Trypsin system from the 2016 DOCK tutorial. This method will utilize the multi-grid scoring function, called through the descriptor score.
Preparing The Files
Before the Denovo module can be run, please ensure you have ran the DOCK 2016 tutorial and have all the resulting files. The tutorial can be accessed through here.
You should have these files in your directory:
001.files:
1BJU.pdb 1BJU.lig.mol2 1BJU.rec.clean.mol2 1BJU.rec.noH.mol2 selected_spheres.sph
Additionally, you will also need these parameter files:
zzz.parameters:
vdw_AMBER_parm99.defn flex.defn flex_drive.tbl
In order to run Denovo with multigrid scoring, we must first go through several steps:
1). Create a primary residue text file and a reference text file -- selects the primary residues of interest.
2). Make a multigrid file for each specified residue -- forms a grid for each residue specified in previous step.
3). Minimizes ligand mol2 file using multigrids from previous step.
4). Rescores ligand on multigrid to yield a minimized ligand .mol2 file. This serves as the reference ligand for Denovo calculations.
Luckily, our good friend Brian generated some extremely robust scripts to make this process easier. There is one script for each step, but we will only use the simple input files for DOCK. If you are interested in using the scripts (and a lot of debugging), they can be found on lired under: /gfps/home/guest43/scratch/denovo/trial_denovo/run/ .
DOCK Specifying Primary Residues
Create a directory within your working directory titled 008.footprint_rescore. This is where all pertinent files from this step will go, and where we will run our calculation from.
The input file for this step should be titled 1BJU.footpring_rescore.in, and should look like:
conformer_search_type rigid
use_internal_energy no
ligand_atom_file ${WORKDIR}/001.files/1BJU.lig.mol2
limit_max_ligands no
skip_molecule no
read_mol_solvation no
calculate_rmsd no
use_database_filter no
orient_ligand no
bump_filter no
score_molecules yes
contact_score_primary no
contact_score_secondary no
grid_score_primary no
grid_score_secondary no
multigrid_score_primary no
multigrid_score_secondary no
dock3.5_score_primary no
dock3.5_score_secondary no
continuous_score_primary no
continuous_score_secondary no
footprint_similarity_score_primary yes
footprint_similarity_score_secondary no
fps_use_footprint_reference_mol2 yes
fps_footprint_reference_mol2_filename ${WORKDIR}/001.files/1BJU.lig.mol2
fps_foot_compare_type d
fps_normalize_foot no
fps_foot_comp_all_residue no
fps_choose_foot_range_type threshold
fps_vdw_threshold 1
fps_es_threshold 0.5
fps_hb_threshold 0.5
fps_use_remainder yes
fps_receptor_filename ${WORKDIR}/001.files/1BJU.rec.clean.mol2
fps_vdw_att_exp 6
fps_vdw_rep_exp 12
fps_vdw_rep_rad_scale 1
fps_use_distance_dependent_dielectric yes
fps_dielectric 4.0
fps_vdw_fp_scale 1
fps_es_fp_scale 1
fps_hb_fp_scale 0
descriptor_score_secondary no
gbsa_zou_score_secondary no
gbsa_hawkins_score_secondary no
SASA_descriptor_score_secondary no
amber_score_secondary no
minimize_ligand no
atom_model all
vdw_defn_file ${WORKDIR}/001.files/vdw_AMBER_parm99.defn
flex_defn_file ${WORKDIR}/001.files/flex.defn
flex_drive_file ${WORKDIR}/001.files/flex_drive.tbl
ligand_outfile_prefix output
write_footprints yes
write_hbonds no
write_orientations no
num_scored_conformers 1
rank_ligands no
This calculation should be done very quickly (<10 seconds), and upon finishing you will have three output files:
1BJU.footprint_rescore.out output_footprint_scored.txt output_scored.mol2
Now, we must declare the primary residues in the active site and generate a grid file for each. Create a new file in the text editor named 1BJU.primary_residues.sh. Write this inside of it (copied from Brian's script *.fpsrescore.qsub.sh):
grep -A 1 "range_union" 1BJU.footprint_rescore.out |
grep -v "range_union" |
grep -v "\-" |
sed -e '{s/,/\n/g}' |
sed -e '{s/ //g}' |
sed '/^$/d' |
sort -n |
uniq > temp.dat
for i in `cat temp.dat`; do printf "%0*d\n" 3 $i; done > 1BJU.primary_residues.dat
for RES in `cat temp.dat`
do
grep " ${RES} " output_footprint_scored.txt |
awk -v temp=${RES} '{if ($2 == temp) print $0;}' |
awk '{print $1 " " $3 " " $4}' >> reference.txt
done
grep "remainder" output_footprint_scored.txt |
sed -e '{s/,/ /g}' |
tr -d '\n' |
awk '{print $2 " " $3 " " $6}' >> reference.txt
mv reference.txt 1BJU.reference.txt
rm temp.dat
Run the script and you should have two new files:
1BJU.primary_residues.dat 1BJU.reference.txt
These are our primary residues! Now we need to generate a grid for each one.
Generating the Grids
We must now generate a grid file for each residue. To do so, we will need the aid of another one of Brian's scripts: 1BJU.make_multigrids.qsub.sh. But before we can use his script, we need to generate two input files for Dock which will be called upon by the script. Create a file named 1BJU.multigrid.in inside your 007.multigrid folder with the following inside it:
compute_grids yes grid_spacing 0.4 output_molecule yes contact_score no chemical_score no energy_score yes energy_cutoff_distance 9999 atom_model a attractive_exponent 6 repulsive_exponent 9 distance_dielectric yes dielectric_factor 4 bump_filter yes bump_overlap 0.75 receptor_file temp.mol2 box_file ../001.files/1bju.box.pdb vdw_definition_file ../001.files/vdw_AMBER_parm99.defn chemical_definition_file ../001.files/chem.defn score_grid_prefix temp.rec receptor_out_file temp.rec.grid.mol2
Additionally, create a file named 1BJU.reference_multigrid.in:
conformer_search_type rigid use_internal_energy yes internal_energy_rep_exp 12 internal_energy_cutoff 100.0 ligand_atom_file ../001.files/1BJU.lig.mol2 limit_max_ligands no skip_molecule no read_mol_solvation no calculate_rmsd yes use_rmsd_reference_mol yes rmsd_reference_filename ../001.files/1BJU.lig.mol2 use_database_filter no orient_ligand no bump_filter no score_molecules yes contact_score_primary no contact_score_secondary no grid_score_primary no grid_score_secondary no multigrid_score_primary yes multigrid_score_secondary no multigrid_score_rep_rad_scale 1 multigrid_score_vdw_scale 1 multigrid_score_es_scale 1 multigrid_score_number_of_grids 19 multigrid_score_grid_prefix0 ../007.multigrid/1BJU.resid_001 multigrid_score_grid_prefix1 ../007.multigrid/1BJU.resid_040 multigrid_score_grid_prefix2 ../007.multigrid/1BJU.resid_081 multigrid_score_grid_prefix3 ../007.multigrid/1BJU.resid_084 multigrid_score_grid_prefix4 ../007.multigrid/1BJU.resid_171 multigrid_score_grid_prefix5 ../007.multigrid/1BJU.resid_172 multigrid_score_grid_prefix6 ../007.multigrid/1BJU.resid_173 multigrid_score_grid_prefix7 ../007.multigrid/1BJU.resid_174 multigrid_score_grid_prefix8 ../007.multigrid/1BJU.resid_176 multigrid_score_grid_prefix9 ../007.multigrid/1BJU.resid_177 multigrid_score_grid_prefix10 ../007.multigrid/1BJU.resid_191 multigrid_score_grid_prefix11 ../007.multigrid/1BJU.resid_192 multigrid_score_grid_prefix12 ../007.multigrid/1BJU.resid_193 multigrid_score_grid_prefix13 ../007.multigrid/1BJU.resid_194 multigrid_score_grid_prefix14 ../007.multigrid/1BJU.resid_196 multigrid_score_grid_prefix15 ../007.multigrid/1BJU.resid_197 multigrid_score_grid_prefix16 ../007.multigrid/1BJU.resid_204 multigrid_score_grid_prefix17 ../007.multigrid/1BJU.resid_206 multigrid_score_grid_prefix18 /gpfs/home/guest43/scratch/denovo/wiki_denovo/007.multigrid/1BJU.resid_remaining multigrid_score_fp_ref_mol no multigrid_score_fp_ref_text yes multigrid_score_footprint_text /gpfs/home/guest43/scratch/denovo/wiki_denovo/008.footprint_rescore/1BJU.reference.txt multigrid_score_use_euc yes multigrid_score_use_norm_euc no multigrid_score_use_cor no multigrid_vdw_euc_scale 1 multigrid_es_euc_scale 1 dock3.5_score_secondary no continuous_score_secondary no footprint_similarity_score_secondary no ph4_score_secondary no descriptor_score_secondary no gbsa_zou_score_secondary no gbsa_hawkins_score_secondary no SASA_descriptor_score_secondary no amber_score_secondary no minimize_ligand yes simplex_max_iterations 1000 simplex_tors_premin_iterations 0 simplex_max_cycles 1 simplex_score_converge 0.1 simplex_cycle_converge 1.0 simplex_trans_step 1.0 simplex_rot_step 0.1 simplex_tors_step 10.0 simplex_random_seed 0 simplex_restraint_min yes simplex_coefficient_restraint 5.0 atom_model all vdw_defn_file ../001.files/vdw_AMBER_parm99.defn flex_defn_file ../001.files/flex.defn flex_drive_file ../001.files/flex_drive.tbl ligand_outfile_prefix output write_orientations no num_scored_conformers 1 rank_ligands no
Now that we have our input files, we can form the script that will call upon them to generate the grid files for each specified residue. Create a blank file named 1BJU.make_multigrids.qsub.sh in your 007.multigrid folder. Then transcribe into it:
cd /gpfs/home/guest43/scratch/denovo/trial_denovo/009.make-mg/
export PRIMARY_RES=` cat ../008.footprint_rescore/1BJU.primary_residues.dat | sed -e 's/\n/ /g' `
export DOCKHOME="/gpfs/home/guest43/local/dock.6.7_2015-02-17.denovo_paper.2016.05.04/"
python /gpfs/home/guest43/local/dock.6.7_2015-02-17.denovo_paper.2016.05.04/bin/multigrid_fp_gen.py ../001.files/1BJU.rec.clean.mol2 1BJU.resid 1BJU.multigrid.in ${PRIMARY_RES}
rm temp.mol2
rm 1BJU.resid_*.rec.grid.mol2
/gpfs/home/guest43/local/dock.6.7_2015-02-17.denovo_paper.2016.05.04/bin/dock6 -i 1BJU.reference_multigridmin.in -o 1BJU.reference_multigridmin.out
mv output_scored.mol2 1BJU.lig.multigridmin.mol2
cp 1BJU.lig.multigridmin.mol2 ../001.files/
Change the path to Dock and your primary residue file if necessary, and ensure you are using a version of Dock with the Denovo code.
After running this script, you should be given a plethora of different files. If you are running on the 1BJU system, you should have 19 different residues: 18 individual residues, and a 19th file containing the grid for the rest of the residues. You will have four files for each residue: a .bmp file, a .mol2 file, a .nrg file, and a .out file (for each residue!). Additionally you should have two other files: 1BJU.lig.multigridmin.mol2, 1BJU.reference_multigridmin.out. Check your output file for any errors and to make sure everything ran to completion. Visualize your ligand in Chimera to make sure it contains atoms and looks like a real chemical structure. You should have something that looks like this:
Minimizing Ligand on Grids
We're taking the input here straight from Brian's script for this part (run.003e.mg_rescore.sh). Create an input file named 1BJU.parents_multigridmin.in with this inside it:
conformer_search_type rigid use_internal_energy yes internal_energy_rep_exp 12 internal_energy_cutoff 100.0 ligand_atom_file ../001.files/1BJU.lig.mol2 limit_max_ligands no skip_molecule no read_mol_solvation no calculate_rmsd no use_database_filter no orient_ligand no bump_filter no score_molecules yes contact_score_primary no contact_score_secondary no grid_score_primary no grid_score_secondary no multigrid_score_primary yes multigrid_score_secondary no multigrid_score_rep_rad_scale 1 multigrid_score_vdw_scale 1 multigrid_score_es_scale 1 multigrid_score_number_of_grids 19 multigrid_score_grid_prefix0 ../007.multigrid/1BJU.resid_001 multigrid_score_grid_prefix1 ../007.multigrid/1BJU.resid_040 multigrid_score_grid_prefix2 ../007.multigrid/1BJU.resid_081 multigrid_score_grid_prefix3 ../007.multigrid/1BJU.resid_084 multigrid_score_grid_prefix4 ../007.multigrid/1BJU.resid_171 multigrid_score_grid_prefix5 ../007.multigrid/1BJU.resid_172 multigrid_score_grid_prefix6 ../007.multigrid/1BJU.resid_173 multigrid_score_grid_prefix7 ../007.multigrid/1BJU.resid_174 multigrid_score_grid_prefix8 ../007.multigrid/1BJU.resid_176 multigrid_score_grid_prefix9 ../007.multigrid/1BJU.resid_177 multigrid_score_grid_prefix10 ../007.multigrid/1BJU.resid_191 multigrid_score_grid_prefix11 ../007.multigrid/1BJU.resid_192 multigrid_score_grid_prefix12 ../007.multigrid/1BJU.resid_193 multigrid_score_grid_prefix13 ../007.multigrid/1BJU.resid_194 multigrid_score_grid_prefix14 ../007.multigrid/1BJU.resid_196 multigrid_score_grid_prefix15 ../007.multigrid/1BJU.resid_197 multigrid_score_grid_prefix16 ../007.multigrid/1BJU.resid_204 multigrid_score_grid_prefix17 ../007.multigrid/1BJU.resid_206 multigrid_score_grid_prefix18 ../007.multigrid/1BJU.resid_remaining multigrid_score_fp_ref_mol no multigrid_score_fp_ref_text yes multigrid_score_footprint_text ../008.footprint_rescore/1BJU.reference.txt multigrid_score_use_euc yes multigrid_score_use_norm_euc no multigrid_score_use_cor no multigrid_vdw_euc_scale 1 multigrid_es_euc_scale 1 dock3.5_score_secondary no continuous_score_secondary no footprint_similarity_score_secondary no ph4_score_secondary no descriptor_score_secondary no gbsa_zou_score_secondary no gbsa_hawkins_score_secondary no SASA_descriptor_score_secondary no amber_score_secondary no minimize_ligand yes simplex_max_iterations 1000 simplex_tors_premin_iterations 0 simplex_max_cycles 1 simplex_score_converge 0.1 simplex_cycle_converge 1.0 simplex_trans_step 1.0 simplex_rot_step 0.1 simplex_tors_step 10.0 simplex_random_seed 0 simplex_restraint_min yes simplex_coefficient_restraint 5.0 atom_model all vdw_defn_file /gpfs/home/guest43/scratch/denovo/wiki_denovo/001.files/vdw_AMBER_parm99.defn flex_defn_file /gpfs/home/guest43/scratch/denovo/wiki_denovo/001.files/flex.defn flex_drive_file /gpfs/home/guest43/scratch/denovo/wiki_denovo/001.files/flex_drive.tbl ligand_outfile_prefix output write_orientations no num_scored_conformers 1 rank_ligands no
After running this you should have an output file (which should be checked for errors, as always) and a .mol2 file named 1BJU.parents_multigridmin.mol2. This is the mol2 file of the ligand minimized using the multigrids. Inspect the file with VI or less to ensure that it has atomic coordinates, and visualize it in Chimera to ensure it looks like a real molecule. This will serve as our reference molecule for guided growth!
Running Denovo
We can now run a Denovo calculation! Rejoice!
