Difference between revisions of "2019 AMBER tutorial with PDBID 2BXF"
From Rizzo_Lab
Stonybrook (talk | contribs) (→Equilibration) |
Stonybrook (talk | contribs) (→H Bond) |
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| Line 1: | Line 1: | ||
| − | + | 2BXF with an explicit solvent model | |
= Prepare the files = | = Prepare the files = | ||
| − | Convert | + | Convert 2BXF.lig.withH.charged.mol2 to pdb in chimera |
| − | Convert | + | Convert 2BXF.rec.withH.charged.mol2 to pdb in chimera |
Copy into zzz.master | Copy into zzz.master | ||
| Line 17: | Line 17: | ||
Paramaterize the ligand | Paramaterize the ligand | ||
| − | antechamber -i ../zzz.master/ | + | antechamber -i ../zzz.master/2BXF.lig.withH.charged.pdb -fi pdb -o 2BXF_lig.am1bcc.mol2 -fo mol2 -at gaff2 -c bcc -rn LIG -nc -1 |
Check for missing force field parameters | Check for missing force field parameters | ||
| − | parmchk2 -i | + | parmchk2 -i 2BXF_lig.am1bcc.mol2 -f mol2 -o 2BXF_lig.am1bcc.frcmod |
= TLeap = | = TLeap = | ||
| Line 329: | Line 329: | ||
#!/bin/sh | #!/bin/sh | ||
| − | #PBS -N | + | #PBS -N 2BXF_equilibration |
#PBS -l walltime=04:00:00 | #PBS -l walltime=04:00:00 | ||
#PBS -l nodes=2:ppn=28 | #PBS -l nodes=2:ppn=28 | ||
| Line 340: | Line 340: | ||
do_parallel="sander" | do_parallel="sander" | ||
| − | prmtop="../001.tleap_build/ | + | prmtop="../001.tleap_build/2BXF.wet.complex.prmtop" |
| − | coords="../001.tleap_build/ | + | coords="../001.tleap_build/2BXF.wet.complex" |
| Line 389: | Line 389: | ||
cut=8.0, ! Nonbonded cutoff in Angstroms | cut=8.0, ! Nonbonded cutoff in Angstroms | ||
ntr=1, ! Turn on restraints | ntr=1, ! Turn on restraints | ||
| − | restraintmask=":1- | + | restraintmask=":1-579@CA,C,N", ! atoms to be restrained |
restraint_wt=0.1, ! force constant for restraint | restraint_wt=0.1, ! force constant for restraint | ||
ntxo=1, ! Write coordinate file in ASCII format | ntxo=1, ! Write coordinate file in ASCII format | ||
| Line 398: | Line 398: | ||
#!/bin/sh | #!/bin/sh | ||
| − | #PBS -N | + | #PBS -N 2BXF_production |
#PBS -l walltime=24:00:00 | #PBS -l walltime=24:00:00 | ||
#PBS -l nodes=2:ppn=24 | #PBS -l nodes=2:ppn=24 | ||
| Line 411: | Line 411: | ||
do_cuda="mpirun pmemd.MPI" | do_cuda="mpirun pmemd.MPI" | ||
| − | prmtop="../../001.tleap_build/ | + | prmtop="../../001.tleap_build/2BXF.wet.complex.prmtop" |
coords="../../002.equilbration/09.equil" | coords="../../002.equilbration/09.equil" | ||
| Line 464: | Line 464: | ||
#!/bin/sh | #!/bin/sh | ||
| − | #PBS -N | + | #PBS -N 2BXF_production |
#PBS -l walltime=24:00:00 | #PBS -l walltime=24:00:00 | ||
#PBS -l nodes=2:ppn=24 | #PBS -l nodes=2:ppn=24 | ||
| Line 477: | Line 477: | ||
do_cuda="mpirun pmemd.MPI" | do_cuda="mpirun pmemd.MPI" | ||
| − | prmtop="../../001.tleap_build/ | + | prmtop="../../001.tleap_build/2BXF.wet.complex.prmtop" |
coords="../../002.equilbration/09.equil" | coords="../../002.equilbration/09.equil" | ||
| Line 504: | Line 504: | ||
#!/usr/bin/sh | #!/usr/bin/sh | ||
| − | parm ../../001.tleap_build/ | + | parm ../../001.tleap_build/2BXF.wet.complex.prmtop |
#read in trajectory | #read in trajectory | ||
trajin ../../003.production/001.restrained/10.prod.trj | trajin ../../003.production/001.restrained/10.prod.trj | ||
#read in reference | #read in reference | ||
| − | reference ../../001.tleap_build/ | + | reference ../../001.tleap_build/2BXF.wet.complex.rst7 |
#compute rmsd and align CA to the crystal structure | #compute rmsd and align CA to the crystal structure | ||
| − | rmsd rms1 reference :1- | + | rmsd rms1 reference :1-578@CA |
#strip Solvent | #strip Solvent | ||
strip :WAT:Na+:Cl- | strip :WAT:Na+:Cl- | ||
#create gas-phase trajectory | #create gas-phase trajectory | ||
| − | trajout | + | trajout 2BXF.stripfit.restrained.gas.trj nobox |
Run cpptraj | Run cpptraj | ||
| Line 522: | Line 522: | ||
#!/usr/bin/sh | #!/usr/bin/sh | ||
#trajin the trajectory | #trajin the trajectory | ||
| − | trajin | + | trajin 2BXF.stripfit.restrained.gas.trj |
#read in the reference | #read in the reference | ||
| − | reference ../../001.tleap_build/ | + | reference ../../001.tleap_build/2BXF.gas.complex.rst7 |
#compute the RMSD (do not fit the internal geometries first, included rigid body motions | #compute the RMSD (do not fit the internal geometries first, included rigid body motions | ||
#and convert the frames to ns (framenum*.005) | #and convert the frames to ns (framenum*.005) | ||
| − | rmsd rms1 ": | + | rmsd rms1 ":579&!(@H=)" nofit mass out 2BXF.lig.restrained.rmsd.nofit.dat time .005 |
#histogram the nofit rmsd | #histogram the nofit rmsd | ||
| − | histogram rms1,*,*,.1,* norm out | + | histogram rms1,*,*,.1,* norm out 2BXF.lig.restrained.rmsd.nofit.histogram.dat |
Run cpptraj | Run cpptraj | ||
| − | cpptraj -p ../../001.tleap_build/ | + | cpptraj -p ../../001.tleap_build/2BXF.gas.complex.prmtop -i cpptraj.rmsd.lig.in |
Create cpptraj.rmsd.rec.in | Create cpptraj.rmsd.rec.in | ||
#!/usr/bin/sh | #!/usr/bin/sh | ||
#trajin the trajectory | #trajin the trajectory | ||
| − | trajin | + | trajin 2BXF.stripfit.restrained.gas.trj |
#read in the reference | #read in the reference | ||
| − | reference ../../001.tleap_build/ | + | reference ../../001.tleap_build/2BXF.gas.complex.rst7 |
#compute the RMSD (do not fit the internal geometries first, included rigid body motions | #compute the RMSD (do not fit the internal geometries first, included rigid body motions | ||
#and convert the frames to ns (framenum*.005) | #and convert the frames to ns (framenum*.005) | ||
| − | rmsd rms1 ":1- | + | rmsd rms1 ":1-578&!(@H=)" nofit mass out 2BXF.rec.restrained.rmsd.nofit.dat time .005 |
#histogram the nofit rmsd | #histogram the nofit rmsd | ||
| − | histogram rms1,*,*,.1,* norm out | + | histogram rms1,*,*,.1,* norm out 2BXF.rec.restrained.rmsd.nofit.histogram.dat |
Run cpptraj | Run cpptraj | ||
| − | cpptraj -p ../../001.tleap_build/ | + | cpptraj -p ../../001.tleap_build/2BXF.gas.complex.prmtop -i cpptraj.rmsd.rec.in |
==H Bond== | ==H Bond== | ||
| Line 561: | Line 561: | ||
#autoimage | #autoimage | ||
#compute intra and water mediated hydrogen bonds | #compute intra and water mediated hydrogen bonds | ||
| − | hbond hb1 :1- | + | hbond hb1 :1-579 out 2BXF_sunitinib.hbond.out avgout 2BXF_sunitinib.hbond.avg.dat solventdonor :WAT solventacceptor :WAT@O |
nointramol brid\ | nointramol brid\ | ||
| − | geout | + | geout 2BXF_sunitinib.bridge-water.dat dist 3.0 angle 140 |
Run cpptraj | Run cpptraj | ||
| − | cpptraj -p ../../001.tleap_build/ | + | cpptraj -p ../../001.tleap_build/2BXF.wet.complex.prmtop -i cpptraj.hbond.in |
==MMGBSA== | ==MMGBSA== | ||
| Line 574: | Line 574: | ||
Create mmgbsa.in | Create mmgbsa.in | ||
| − | mmgbsa | + | mmgbsa 2BXF analysis |
&general | &general | ||
interval=1, netcdf=1, | interval=1, netcdf=1, | ||
| Line 605: | Line 605: | ||
#Define topology files | #Define topology files | ||
| − | solv_prmtop="../../001.tleap_build/ | + | solv_prmtop="../../001.tleap_build/2BXF.wet.complex.prmtop" |
| − | complex_prmtop="../../001.tleap_build/ | + | complex_prmtop="../../001.tleap_build/2BXF.gas.complex.prmtop" |
| − | receptor_prmtop="../../001.tleap_build/ | + | receptor_prmtop="../../001.tleap_build/2BXF.gas.receptor.prmtop" |
| − | ligand_prmtop="../../001.tleap_build/ | + | ligand_prmtop="../../001.tleap_build/2BXF.gas.ligand.prmtop" |
trajectory="../../003.production/001.restrained/10.prod.trj" | trajectory="../../003.production/001.restrained/10.prod.trj" | ||
| Line 636: | Line 636: | ||
MMPBSA.py -O -i mmgbsa.in \ | MMPBSA.py -O -i mmgbsa.in \ | ||
| − | -o | + | -o 2BXF.mmgbsa.results.dat \ |
| − | -eo | + | -eo 2BXF.mmgbsa.per-frame.dat \ |
-sp ${solv_prmtop} \ | -sp ${solv_prmtop} \ | ||
-cp ${complex_prmtop} \ | -cp ${complex_prmtop} \ | ||
| Line 649: | Line 649: | ||
qsub mmgbsa.sh | qsub mmgbsa.sh | ||
| − | The last line of our | + | The last line of our 2BXF.mmgbsa.results.dat file shows that our delta G binding is -24.4431 +/- 5.4851. |
Latest revision as of 15:14, 19 April 2019
2BXF with an explicit solvent model
Contents
Prepare the files
Convert 2BXF.lig.withH.charged.mol2 to pdb in chimera
Convert 2BXF.rec.withH.charged.mol2 to pdb in chimera
Copy into zzz.master
Parameters
The system we are working on has two main components (Protein receptor & ligand). The usual forcefield "ff14SB" contains all the parameters needed for calculations of the protein. However, the ligand is a non-protein component. Therefore, ff14SB forcefield does not contain the parameters needed for the calculations regarding the ligand. Therefore, we need to generate parameters needed for the ligand. The following steps will be taken using antechamber in order to generate the ligand parameters.
Move into 000.programs
Paramaterize the ligand
antechamber -i ../zzz.master/2BXF.lig.withH.charged.pdb -fi pdb -o 2BXF_lig.am1bcc.mol2 -fo mol2 -at gaff2 -c bcc -rn LIG -nc -1
Check for missing force field parameters
parmchk2 -i 2BXF_lig.am1bcc.mol2 -f mol2 -o 2BXF_lig.am1bcc.frcmod
TLeap
Move into 001.tleap_build
Create tleap.build.in file
#!/usr/bin/sh
###Load Protein force field
source leaprc.protein.ff14SB
###Load GAFF force field (for our ligand)
source leaprc.gaff
###Load TIP3P (water) force field
source leaprc.water.tip3p
####Load Ions frcmod for the tip3p model
loadamberparams frcmod.ionsjc_tip3p
###Needed so we can use igb=8 model
set default PBradii mbondi3
###Load Protein pdb file
rec=loadpdb ../zzz.master/backup.pdb
bond rec.49.SG rec.58.SG
bond rec.241.SG rec.249.SG
bond rec.71.SG rec.87.SG
bond rec.86.SG rec.97.SG
bond rec.120.SG rec.165.SG
bond rec.164.SG rec.173.SG
bond rec.510.SG rec.555.SG
bond rec.472.SG rec.482.SG
bond rec.457.SG rec.473.SG
bond rec.196.SG rec.242.SG
bond rec.261.SG rec.275.SG
bond rec.312.SG rec.357.SG
bond rec.274.SG rec.285.SG
bond rec.388.SG rec.434.SG
bond rec.433.SG rec.444.SG
bond rec.554.SG rec.563.SG
bond rec.356.SG rec.365.SG
###Load Ligand frcmod/mol2
loadamberparams ../000.parameters/2BXF_lig.am1bcc.frcmod
lig=loadmol2 ../000.parameters/2BXF_lig.am1bcc.mol2
###Create gas-phase complex
gascomplex= combine {rec lig}
###Write gas-phase pdb
savepdb gascomplex 2BXF.gas.complex.pdb
###Write gas-phase toplogy and coord files for MMGBSA calc
saveamberparm gascomplex 2BXF.gas.complex.prmtop 2BXF.gas.complex.rst7
saveamberparm rec 2BXF.gas.receptor.prmtop 2BXF.gas.receptor.rst7
saveamberparm lig 2BXF.gas.ligand.prmtop 2BXF.gas.ligand.rst7
###Create solvated complex (albeit redundant)
solvcomplex= combine {rec lig}
###Solvate the system
solvateoct solvcomplex TIP3PBOX 12.0
###Neutralize system (it will add either Na or Cl depending on net charge)
addions solvcomplex Cl- 0
addions solvcomplex Na+ 0
###Write solvated pdb file
savepdb solvcomplex 2BXF.wet.complex.pdb
###Check the system
charge solvcomplex
check solvcomplex
###Write Solvated topology and coord file
saveamberparm solvcomplex 2BXF.wet.complex.prmtop 2BXF.wet.complex.rst7
tleap -f tleap.build.in
Equilibration
Create the following input files for the equilibration of the system.
vim 01.min.mdin
Minmize all the hydrogens &cntrl imin=1, ! Minimize the initial structure ntmin=2, ! Use steepest descent Ryota Added maxcyc=5000, ! Maximum number of cycles for minimization ntb=1, ! Constant volume ntp=0, ! No pressure scaling ntf=1, ! Complete force evaluation ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=5.0, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format /
vim 02.equil.mdin
MD simualation &cntrl imin=0, ! Perform MD nstlim=50000 ! Number of MD steps ntb=2, ! Constant Pressure ntc=1, ! No SHAKE on bonds between hydrogens dt=0.001, ! Timestep (ps) ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=1, ! Complete force evaluation ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=5.0, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on /
vim 03.min.mdin
Minmize all the hydrogens &cntrl imin=1, ! Minimize the initial structure maxcyc=1000, ! Maximum number of cycles for minimization ntb=1, ! Constant volume ntp=0, ! No pressure scaling ntf=1, ! Complete force evaluation ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=2.0, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format /
vim 04.min.mdin
Minmize all the hydrogens &cntrl imin=1, ! Minimize the initial structure maxcyc=1000, ! Maximum number of cycles for minimization ntb=1, ! Constant volume ntp=0, ! No pressure scaling ntf=1, ! Complete force evaluation ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=0.1, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format /
vim 05.min.mdin Minmize all the hydrogens &cntrl imin=1, ! Minimize the initial structure maxcyc=1000, ! Maximum number of cycles for minimization ntb=1, ! Constant volume ntp=0, ! No pressure scaling ntf=1, ! Complete force evaluation ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=0.05, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format /
vim 06.equil.mdin
MD simualation &cntrl imin=0, ! Perform MD nstlim=50000 ! Number of MD steps ntb=2, ! Constant Pressure ntc=1, ! No SHAKE on bonds between hydrogens dt=0.001, ! Timestep (ps) ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=1, ! Complete force evaluation ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=1.0, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on /
vim 07.equil.mdin
MD simulation &cntrl imin=0, ! Perform MD nstlim=50000 ! Number of MD steps ntx=5, ! Positions and velocities read formatted irest=1, ! Restart calculation ntc=1, ! No SHAKE on for bonds with hydrogen dt=0.001, ! Timestep (ps) ntb=2, ! Constant Pressure ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=1, ! Complete force evaluation ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579 & !@H=", ! atoms to be restrained restraint_wt=0.5, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on /
vim 08.equil.mdin
MD simulations &cntrl imin=0, ! Perform MD nstlim=50000 ! Number of MD steps ntx=5, ! Positions and velocities read formatted irest=1, ! Restart calculation ntc=1, ! No SHAKE on for bonds with hydrogen dt=0.001, ! Timestep (ps) ntb=2, ! Constant Pressure ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=1, ! Complete force evaluation ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-578@CA,C,N", ! atoms to be restrained restraint_wt=0.1, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on /
vim 09.equil.mdin
MD simulations &cntrl imin=0, ! Perform MD nstlim=50000 ! Number of MD steps ntx=5, ! Positions and velocities read formatted irest=1, ! Restart calculation ntc=1, ! No SHAKE on for bonds with hydrogen dt=0.001, ! Timestep (ps) ntb=2, ! Constant Pressure ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=1, ! Complete force evaluation ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 1000, ! Write to trajectory file every ntwx steps ntpr= 1000, ! Print to mdout every ntpr steps ntwr= 1000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-578@CA,C,N", ! atoms to be restrained restraint_wt=0.1, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on /
Create a submission script that utilizes, above input files to equilibrate the biological system.
vim mdequilibration.sh
#!/bin/sh
#PBS -N 2BXF_equilibration
#PBS -l walltime=04:00:00
#PBS -l nodes=2:ppn=28
#PBS -j oe
#PBS -q long
cd $PBS_O_WORKDIR
echo "Started Equilibration on `date` "
do_parallel="sander"
prmtop="../001.tleap_build/2BXF.wet.complex.prmtop"
coords="../001.tleap_build/2BXF.wet.complex"
MDINPUTS=(01.min 02.equil 03.min 04.min 05.min 06.equil 07.equil 08.equil 09.equil)
for input in ${MDINPUTS[@]}; do
$do_parallel -O -i ${input}.mdin -o ${input}.mdout -p $prmtop -c ${coords}.rst7 -ref ${coords}.rst7 -x ${input}.trj -inf
${input}.info -r ${input}.rst7
coords=$input
done
echo "Finished Equilibration on `date` "
Submit the job
qsub md.equilibration.sh
Production
Move into 003.production
Move into 001.restrained
Create 10.prod.mdin
MD simulations &cntrl imin=0, ! Perform MD nstlim=5000000, ! Number of MD steps ntx=5, ! Positions and velocities read formatted irest=1, ! Restart calculation ntc=2, ! SHAKE on for bonds with hydrogen dt=0.002, ! Timestep (ps) ntb=2, ! Constant Pressure ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=2, ! No force evaluation for bonds with hydrogen ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 2500, ! Write to trajectory file every ntwx steps ntpr= 2500, ! Print to mdout every ntpr steps ntwr= 5000000, ! Write a restart file every ntwr steps cut=8.0, ! Nonbonded cutoff in Angstroms ntr=1, ! Turn on restraints restraintmask=":1-579@CA,C,N", ! atoms to be restrained restraint_wt=0.1, ! force constant for restraint ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on
Create prod.sh
#!/bin/sh
#PBS -N 2BXF_production
#PBS -l walltime=24:00:00
#PBS -l nodes=2:ppn=24
#PBS -j oe
#PBS -o production.output
#PBS -q long
cd $PBS_O_WORKDIR
echo "Started Production on `date` "
#do_parallel="mpirun pmemd.MPI"
do_cuda="mpirun pmemd.MPI"
prmtop="../../001.tleap_build/2BXF.wet.complex.prmtop"
coords="../../002.equilbration/09.equil"
MDINPUTS=(10.prod)
for input in ${MDINPUTS[@]}; do
$do_cuda -O -i ${input}.mdin -o ${input}.mdout -p $prmtop -c ${coords}.rst7 -ref ${coords}.rst7 -x ${input}.trj -inf
${input}.info -r ${input}.rst7
coords=$input
done
echo "Finished Production on `date` "
Submit the job
qsub prod.sh
Move into 002.unrestrained
Create 10.prod.mdin
MD simulations &cntrl imin=0, ! Perform MD nstlim=5000000 ! Number of MD steps ntx=5, ! Positions and velocities read formatted irest=1, ! Restart calculation ntc=2, ! SHAKE on for bonds with hydrogen dt=0.002, ! Timestep (ps) ntb=2, ! Constant Pressure ntp=1, ! Isotropic pressure scaling barostat=1 ! Berendsen taup=0.5 ! Pressure relaxtion time (ps) ntf=2, ! No force evaluation for bonds with hydrogen ntt=3, ! Langevin thermostat gamma_ln=2.0 ! Collision Frequency for thermostat ig=-1, ! Random seed for thermostat temp0=298.15 ! Simulation temperature (K) ntwx= 2500, ! Write to trajectory file every ntwx steps ntpr= 2500, ! Print to mdout every ntpr steps ntwr= 5000000, ! Write a restart file every ntwr steps cut= 8.0, ! Nonbonded cutoff in Angstroms ntxo=1, ! Write coordinate file in ASCII format ioutfm=0, ! Write trajectory file in ASCII format iwrap=1, ! iwrap is turned on /
Create prod.sh
#!/bin/sh
#PBS -N 2BXF_production
#PBS -l walltime=24:00:00
#PBS -l nodes=2:ppn=24
#PBS -j oe
#PBS -o production.output
#PBS -q long
cd $PBS_O_WORKDIR
echo "Started Production on `date` "
#do_parallel="mpirun pmemd.MPI"
do_cuda="mpirun pmemd.MPI"
prmtop="../../001.tleap_build/2BXF.wet.complex.prmtop"
coords="../../002.equilbration/09.equil"
MDINPUTS=(10.prod)
for input in ${MDINPUTS[@]}; do
$do_cuda -O -i ${input}.mdin -o ${input}.mdout -p $prmtop -c ${coords}.rst7 -ref ${coords}.rst7 -x ${input}.trj -inf
${input}.info -r ${input}.rst7
coords=$input
done
echo "Finished Production on `date` "
Submit the job
qsub prod.sh
Analysis
RMSD
How far our ligand moved and how far our receptor moved
Create cpptraj.strip.wat.in
#!/usr/bin/sh parm ../../001.tleap_build/2BXF.wet.complex.prmtop #read in trajectory trajin ../../003.production/001.restrained/10.prod.trj #read in reference reference ../../001.tleap_build/2BXF.wet.complex.rst7 #compute rmsd and align CA to the crystal structure rmsd rms1 reference :1-578@CA #strip Solvent strip :WAT:Na+:Cl- #create gas-phase trajectory trajout 2BXF.stripfit.restrained.gas.trj nobox
Run cpptraj
cpptraj -i cpptraj.strip.wat.in
Create cpptraj.rmsd.lig.in
#!/usr/bin/sh #trajin the trajectory trajin 2BXF.stripfit.restrained.gas.trj #read in the reference reference ../../001.tleap_build/2BXF.gas.complex.rst7 #compute the RMSD (do not fit the internal geometries first, included rigid body motions #and convert the frames to ns (framenum*.005) rmsd rms1 ":579&!(@H=)" nofit mass out 2BXF.lig.restrained.rmsd.nofit.dat time .005 #histogram the nofit rmsd histogram rms1,*,*,.1,* norm out 2BXF.lig.restrained.rmsd.nofit.histogram.dat
Run cpptraj
cpptraj -p ../../001.tleap_build/2BXF.gas.complex.prmtop -i cpptraj.rmsd.lig.in
Create cpptraj.rmsd.rec.in
#!/usr/bin/sh #trajin the trajectory trajin 2BXF.stripfit.restrained.gas.trj #read in the reference reference ../../001.tleap_build/2BXF.gas.complex.rst7 #compute the RMSD (do not fit the internal geometries first, included rigid body motions #and convert the frames to ns (framenum*.005) rmsd rms1 ":1-578&!(@H=)" nofit mass out 2BXF.rec.restrained.rmsd.nofit.dat time .005 #histogram the nofit rmsd histogram rms1,*,*,.1,* norm out 2BXF.rec.restrained.rmsd.nofit.histogram.dat
Run cpptraj
cpptraj -p ../../001.tleap_build/2BXF.gas.complex.prmtop -i cpptraj.rmsd.rec.in
H Bond
Hydrogen bonding
Create cpptraj.hbond.in
#!/usr/bin/sh #read in trajectory trajin ../../003.production/001.restrained/10.prod.trj #wrap everything into one periodic cell #autoimage #compute intra and water mediated hydrogen bonds hbond hb1 :1-579 out 2BXF_sunitinib.hbond.out avgout 2BXF_sunitinib.hbond.avg.dat solventdonor :WAT solventacceptor :WAT@O nointramol brid\ geout 2BXF_sunitinib.bridge-water.dat dist 3.0 angle 140
Run cpptraj
cpptraj -p ../../001.tleap_build/2BXF.wet.complex.prmtop -i cpptraj.hbond.in
MMGBSA
This will analyze how strongly our small molecule binds to our receptor.
Create mmgbsa.in
mmgbsa 2BXF analysis
&general
interval=1, netcdf=1,
keep_files=0,
/
&gb
igb=8,
saltcon=0.0, surften=0.0072,
surfoff=0.0, molsurf=0,
/
&nmode
drms=0.001, maxcyc=10000,
nminterval=250, nmendframe=2000,
nmode_igb=1,
/
Create mmgbsa.sh
#!/bin/bash
#PBS -l walltime=35:00:00
#PBS -l nodes=1:ppn=24
#PBS -N 4qmz_mmgbsa
#PBS -V
#PBS -j oe
#PBS -q long-24core
cd $PBS_O_WORKDIR
#Define topology files
solv_prmtop="../../001.tleap_build/2BXF.wet.complex.prmtop"
complex_prmtop="../../001.tleap_build/2BXF.gas.complex.prmtop"
receptor_prmtop="../../001.tleap_build/2BXF.gas.receptor.prmtop"
ligand_prmtop="../../001.tleap_build/2BXF.gas.ligand.prmtop"
trajectory="../../003.production/001.restrained/10.prod.trj"
#create mmgbsa input file
cat >mmgbsa.in<<EOF
mmgbsa HIVgp41 analysis
&general
interval=1, netcdf=1,
keep_files=0,
/
&gb
igb=8,
saltcon=0.0, surften=0.0072,
surfoff=0.0, molsurf=0,
/
&nmode
drms=0.001, maxcyc=10000,
nminterval=250, nmendframe=2000,
nmode_igb=1,
/
EOF
MMPBSA.py -O -i mmgbsa.in \
-o 2BXF.mmgbsa.results.dat \
-eo 2BXF.mmgbsa.per-frame.dat \
-sp ${solv_prmtop} \
-cp ${complex_prmtop} \
-rp ${receptor_prmtop} \
-lp ${ligand_prmtop} \
-y ${trajectory}
Submit your script
qsub mmgbsa.sh
The last line of our 2BXF.mmgbsa.results.dat file shows that our delta G binding is -24.4431 +/- 5.4851.
