[gmx-users] Is there any way to count the number of water molecules around a ligand during simulation of its binding pathway?

2018-11-22 Thread Hassan Aaryapour
Dear Gromacs Users
I would like to calculate the presence of water molecules number as a
function of time, around a ligand during binding to its pocket from a
trj.xtc file.
How can I do it by Gromacs or any other program?
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[gmx-users] Fatal error: Rerun .trr trajectory

2018-06-30 Thread Hassan Aaryapour
Dear Gromacs Users
When I rerun .trr trajectory files for re-calculating energies and forces,
the following error was received. Any suggestion to solve it please?

Command line: gmx mdrun -v -s md.tpr -rerun md.trr
...
---
Program: gmx mdrun, version 2018
Source file: src/programs/mdrun/md.cpp (line 884)
Fatal error: Rerun trajectory frame step 1 time 20.00 does
not contain a box, while pbc is used.

Thanks
Hassan
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[gmx-users] ZNO-HSA (Human Serum albumin) Interaction

2018-02-21 Thread Hassan Aaryapour
Dear Gromacs Users;

I am studying the toxicity effect of ZnO nanoparticle (with a partial
charges of +1.026 and -1.026 for Zinc and Oxygen atoms, respectively) on
the Albumin structure by Gromacs. For MD simulation the nanoparticle was
placed at a distance of 1nm of protein, after running pdb2gmx, the
simulation box was solvated by TIP3P waters. The net charge of protein in
physiological condition is -14 that was neutralized by adding sodium and
chloride ions to box. Then, energy minimization, NVT and NPT were done.
>From the beginning of md simulation, the protein structure began to be
unfolded slowly before binding nanoparticle to it and after binding, the
protein structure changed dramatically. I cannot consider the charge of ZnO
as zero like silver or gold nanoparticles. So, I am confused that whether
the study method is correct or wrong for this interaction? Do the results
seem logical?

Thanks
Hassan Aryapour
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[gmx-users] pulling simulation

2016-07-08 Thread Hassan Aaryapour
Dear Justin A. Lemkul,

Thank you for answer. In US simulation the initial configurations were
generated by translating ligand along the z-axis up to desired distance. Is
it necessary to rotate my protein complex in correct orientation until
protein exit side align with the z-axis and ligand could leave its binding
site? How can I find exit site in protein? The binding pocket is deeply
buried inside the protein and not solvent accessible.

Best Wishes
Hassan



On Tue, Jul 5, 2016 at 5:23 PM, Justin Lemkul <jalem...@vt.edu> wrote:

>
>
> On 7/5/16 3:30 AM, Hassan Aaryapour wrote:
>
>> Dear Justin A. Lemkul,
>>
>>
>>
>> How do you calculated the coordinates for center (3.280, 2.181, 2.4775)
>> and
>> box dimensions 6.560 x 4.362 x 12 in Umbrella Sampling by the following
>> program:
>>
>> gmx editconf -f complex.gro -o newbox.gro -center 3.280 2.181 2.4775 -box
>> 6.560 4.362 12.
>>
>>
> I defined an original box that was 1 nm larger than any protein atom in
> all 3 dimensions, and then took x/2, y/2, and sufficient space along z to
> pull as far as I needed to.
>
> When I calculate the geometrical center by chimera or accelrys discover
>> studio for my protein complex, it was emerged from box edges. How to
>> resolve it by softwares (not manually)?
>>
>>
> I don't know what magic capabilities each program has, though there's no
> reason to do any of it outside of GROMACS.  The solution is
> system-specific, so I don't know that you can really get away from having
> to do something manually.  The initial box definition is done with editconf
> -d (automatic) but then the actual box vectors needed depend on the size of
> the proteins and the length of the reaction coordinate (something that
> needs to be set by the user).
>
> -Justin
>
> --
> ==
>
> Justin A. Lemkul, Ph.D.
> Ruth L. Kirschstein NRSA Postdoctoral Fellow
>
> Department of Pharmaceutical Sciences
> School of Pharmacy
> Health Sciences Facility II, Room 629
> University of Maryland, Baltimore
> 20 Penn St.
> Baltimore, MD 21201
>
> jalem...@outerbanks.umaryland.edu | (410) 706-7441
> http://mackerell.umaryland.edu/~jalemkul
>
> ==
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[gmx-users] How to define coordinates of protein and simulation box in the pulling simulation automatically?

2016-07-05 Thread Hassan Aaryapour
Dear Justin A. Lemkul,



How do you calculated the coordinates for center (3.280, 2.181, 2.4775) and
box dimensions 6.560 x 4.362 x 12 in Umbrella Sampling by the following
program:

gmx editconf -f complex.gro -o newbox.gro -center 3.280 2.181 2.4775 -box
6.560 4.362 12.

When I calculate the geometrical center by chimera or accelrys discover
studio for my protein complex, it was emerged from box edges. How to
resolve it by softwares (not manually)?



Best Regards

Hassan
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[gmx-users] Count the number of water molecules around a macromolecule

2016-04-10 Thread Hassan Aaryapour
Dear Gromacs Users
How can I count the number of water molecules in the first hydration shell
of a macromolecule in the trajectory file?

Thanks
Hassan
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[gmx-users] How to delete Zinc atom from .xtc and .gro files

2016-01-12 Thread Hassan Aaryapour
Dear Gromacs Users,
How can I remove Zinc atoms from .xtc and .gro files after MD simulation.
Thanks
Hassan
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[gmx-users] How can I split .xtc file to two part?

2015-11-23 Thread Hassan Aaryapour
Dear Gromacs Users
How can I make a movie from gromacs trajectory file (200 ns)? VMD was
failed because of low memory of computer (16GB).  for resolving this
problem, can I split .xtc file to two part? how?
Thanks
Hassan
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Re: [gmx-users] Topology file for serotonin (5-HT)

2015-07-27 Thread Hassan Aaryapour
use swissparam server, http://swissparam.ch/

On Mon, Jul 27, 2015 at 3:13 PM, Justin Lemkul jalem...@vt.edu wrote:



 On 7/27/15 1:03 AM, Ganesh Shahane wrote:

 Hi Justin,

 Yes. I tried the same, but during the preparation of the .tpr file using
 grompp it gives an error saying No default proper dihedral types for 3
 dihedral angles which are not present in the ffbonded.itp of the charmm36
 force-field. These 3 dihedrals consist of atoms that encompass the alkyl
 amine and the indole groups of serotonin.

 Now, if I remove these dihedrals in question from the serotonin's .itp
 file
 which I have prepared, the simulation runs just fine. I am trying to
 calculate the free energy of solvation for serotonin. Considering this, is
 it okay to ignore some of these dihedrals?


 Absolutely not.  You can't just delete inconvenient interactions.  If
 there are missing parameters, you need to derive suitable dihedral terms.
 Or just throw the molecule at ParamChem and see how it does.  CGenFF should
 work fine for this molecule.

 -Justin

 --
 ==

 Justin A. Lemkul, Ph.D.
 Ruth L. Kirschstein NRSA Postdoctoral Fellow

 Department of Pharmaceutical Sciences
 School of Pharmacy
 Health Sciences Facility II, Room 629
 University of Maryland, Baltimore
 20 Penn St.
 Baltimore, MD 21201

 jalem...@outerbanks.umaryland.edu | (410) 706-7441
 http://mackerell.umaryland.edu/~jalemkul

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Re: [gmx-users] Repulsive potential

2015-07-21 Thread Hassan Aaryapour
Dear Atsutoshi,

Very thanks for your reply. I run repulsive/nonrepulsive potential
simulations for a system contains (Di-peptide + 2Ligand) for 5ns as
suggestions and, compared final results by VMD. I don't think that there is
really difference between two simulation, ligands are aggregated in both
simulation. All necessary results is uploaded as follow:

http://d01.megashares.com/?d01=HrNDcu4

http://d01.megashares.com/?d01=kdLuTf7


 I would greatly appreciate if you could kindly tell your comments and, if
possible share your required file.


 Sincerely

Hassan




On Tue, Jul 21, 2015 at 11:42 AM, atsutoshi.ok...@takeda.com wrote:

  Dear  Hassan,



 I’m sorry for my late reply. I missed your e-mail.



 I think the easiest way to introduce repulsive potential is  to use draft
 code for  inter-molecular bonded interaction at
 https://gerrit.gromacs.org/#/c/2566/. But nobody has yet tried that it
 works as Mark said.

 Another way, as Justin told us, is to define a dummy atom within the
 structure using a virtual site, then specifying a nonbonded interaction
 only between these virtual sites using [nonbond_params].

 However, I am getting some errors using this methods and trying it if it
 works well.



 Atsutoshi



 *From:* Hassan Aaryapour [mailto:hassan.grom...@gmail.com]
 *Sent:* Friday, June 26, 2015 7:41 PM
 *To:* Okabe, Atsutoshi
 *Subject:* Repulsive potential



 Dear Atsutoshi Okabe,

 I read your email to “mark abraham” about introducing weak repulsive
 potential. I have this problem and, don't know how to do it. I would
 greatly appreciate if you could share your experience and, help me do that
 for a simulation system contains Protein + 6Ligands + Ions and waters
 molecule.

 Best Wishes

 Hassan

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[gmx-users] How to calculate magnesium (MG) parameters for gbsa.itp

2015-07-19 Thread Hassan Aaryapour
Dear Gromacs Users,
I have taken error below after runnig:
gmx grompp -f md-implicit-gpu.mdp -c conf.gro -p topol.top -n index.ndx -o
md-implicit.tpr

GB parameter(s) missing or negative for atom type 'MG'
...
Fatal error:
Can't do GB electrostatics; the implicit_genborn_params section of the
forcefield is missing parameters for 1 atomtypes or they might be negative.

How can I calculate Magnesium (MG) parameters for gbsa.itp in implicit
simulation? I would greatly appreciate if anyone could kindly help me.

Best Wishes
Hassan
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Re: [gmx-users] (no subject)

2015-07-18 Thread Hassan Aaryapour
Dear Justin,
Where can I find the primary literature for setting up proper parameters in
mdp files? I downloaded all literatures in General Information section in
link below (http://ffamber.cnsm.csulb.edu/ffamber.php), but I did not find
anything related to the Cutoffs.

Regards
Hassan


On Sun, Jun 28, 2015 at 10:54 PM, Justin Lemkul jalem...@vt.edu wrote:



 On 6/28/15 3:22 PM, Vidyalakshmi CM wrote:

 Hi,

 You may use the mdp files from the tutorial

 http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/lysozyme/
 (It has topologies for energy minimzation, nvt and npt simulations and md
 simulations run).


 The tutorial .mdp settings are for OPLS-AA and may not be generally
 applicable to any other force field.  This is a non-trivial consideration
 in running simulations properly.

 AMBER force field is a bit generic; different parameter sets use subtly
 different parameters.  The primary literature for the parameter set of
 interest will contain the proper run settings.  Use whatever those settings
 are.

 -Justin

 --
 ==

 Justin A. Lemkul, Ph.D.
 Ruth L. Kirschstein NRSA Postdoctoral Fellow

 Department of Pharmaceutical Sciences
 School of Pharmacy
 Health Sciences Facility II, Room 629
 University of Maryland, Baltimore
 20 Penn St.
 Baltimore, MD 21201

 jalem...@outerbanks.umaryland.edu | (410) 706-7441
 http://mackerell.umaryland.edu/~jalemkul

 ==
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[gmx-users] Install gromacs with intermolecular bonded interaction support

2015-07-03 Thread Hassan Aaryapour
Dear Gromacs-Users,

I want to do a gromacs installation with intermolecular bonded interaction
support to apply a weak repulsive potential between ligands to avoid
aggregation. All of the patches in this URL (
https://gerrit.gromacs.org/#/c/2566/) were added or replaced with original
files in source of gromacs-5.0.5. for installing I obtained below error in
make step.

 $ cmake .. -DGMX_BUILD_OWN_FFTW=ON

$ make -j 8



[ 5%] Building C object
src/gromacs/CMakeFiles/libgromacs.dir/gmxpreprocess/topio.c.o

/home/qmmm/Documents/Softs/gromacs-5.0.5/src/gromacs/gmxpreprocess/topio.c:37:20:
fatal error: gmxpre.h: No such file or directory

#include gmxpre.h

^

compilation terminated.

src/gromacs/CMakeFiles/libgromacs.dir/build.make:537: recipe for target
'src/gromacs/CMakeFiles/libgromacs.dir/gmxpreprocess/topio.c.o' failed

make[2]: ***
[src/gromacs/CMakeFiles/libgromacs.dir/gmxpreprocess/topio.c.o] Error 1

make[2]: *** Waiting for unfinished jobs

CMakeFiles/Makefile2:1653: recipe for target
'src/gromacs/CMakeFiles/libgromacs.dir/all' failed

make[1]: *** [src/gromacs/CMakeFiles/libgromacs.dir/all] Error 2

Makefile:146: recipe for target 'all' failed

make: *** [all] Error 2


 I would greatly appreciate if someone could help me to resolve this error.

Best Wishes

Hassan
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[gmx-users] How to do parallel simulation by OpenMP?

2015-01-29 Thread Hassan Aaryapour
Dear Gromacs Users
How can I connect multiple stand-alone computers together in a network to
make parallel simulation by OpenMP?

Thanks
Hassan
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[gmx-users] How to introduce Mg2+ ions to system that are necessary for nucleotide co-enzymes?

2015-01-06 Thread Hassan Aaryapour
Dear Gromacs Users

I want to do an unguided molecular dynamics simulations (500ns) with GTP or
GDP ligands that place at a random location within a simulation box that
also contained my kinase protein. How can I add or introduce Mg2+ ions to
system that are necessary for GTP or GDP ligands? How much Mg2+ is required
for GTP or GDP molecules in a cubic box with -d 1.0???



Is it logical I add ions to a system with -8.9 net charge using command
below?

# gmx genion -s ions.tpr -o conf-ion.pdb -p topol.top -pname MG –np 4
-pname NA -np 1 -nname CL



Thanks

Hassan
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[gmx-users] How to choose the best pose of ligand from the trajectory file?

2014-12-25 Thread Hassan Aaryapour
Dear Gromacs Users

How can I find and score protein-ligand binding poses and choose the best
pose or frame from the trajectory file after doing a Molecular dynamics
simulation of 40ns?

Best Wishes
Hassan
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[gmx-users] Stop protein diffusion in simulation box to make a movie

2014-12-13 Thread Hassan Aaryapour
Dear Gromacs Users,
I made a trajectory movie using VMD and smoothing increased for
getting the residues motion slower, but the protein is translate and
diffuse in box, and causes very hard of seeing and analyzing how
ligand structure changes during simulation. How can I stop the protein
translation and following ligand motion easier?

Thank you in advance
Hassan
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[gmx-users] Your solvent group size (*) is not a multiple of *

2014-12-09 Thread Hassan Aaryapour
Dear Gromacs Users,

I'm new in gromacs and I have been trying to add ions to the simulation box
using following command in gromacs 5:

gmx genion -s ions.tpr -o conf-ion.pdb -p topol.top -neutral -conc 0.15

 then I selected these groups(Protein, MG, Ligand, respectively): 1 | 13 |
14

This error was appeared:


 Program gmx, VERSION 5.0

Source code file:
/home/QMMM/ProgramFiles/gromacs-5.0/src/gromacs/gmxana/gmx_genion.c, line:
503

Fatal error:

Your solvent group size (2701) is not a multiple of 9

For more information and tips for troubleshooting, please check the GROMACS

website at http://www.gromacs.org/Documentation/Errors


 I found this URL 
http://comments.gmane.org/gmane.science.biology.gromacs.user/64577; in
related to my question but i don't understand answer to resolve my error?

Indeed, I 've already successfully simulated another protein with same
gromacs and commands.

 Thank You in Advance
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Re: [gmx-users] Set the environment variables of FFTW3_INCLUDE_DIR and FFTW3_LIBRARIES

2014-03-03 Thread Hassan Aaryapour
Dear Justin
Thank you for your assistance, I run most of my MD simulations on the
WeNMR server, which have double precision gromacs ver 4.5.3.
Thanks again
hassan



On 3/3/14, Justin Lemkul jalem...@vt.edu wrote:


 On 3/3/14, 5:26 AM, Hassan Aaryapour wrote:
 Dear Gmx-user;
 I want to install double precision gromacs 4.5.3 and FFTW 3.3.2 in my
 home directory.
 first, according to the FFTW installation instructions I installed and
 introduced it to bash shell it as the following order:

 $tar -xzvf fftw-3.3.2.tar.gz
 $./configure --enable-threads --prefix=/home/WeNMR/ProgramFiles/fftw
 $make
 $make install

 export CPPFLAGS=-I/home/WeNMR/ProgramFiles/fftw/include
 export LDFLAGS=-L/home/WeNMR/ProgramFiles/fftw/lib

 but it isn't found automatically by cmake when I want to install gromacs.
 and this error was appeared:

   CMake Error at
 /usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108
 (message):
 Could not find FFTW3.  Provide the fftw3 install directory in the
 FFTW3_ROOT_DIR environment variable.  (missing: FFTW3_LIBRARIES
 FFTW3_INCLUDE_DIR)
   Call Stack (most recent call first):

 /usr/local/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315
 (_FPHSA_FAILURE_MESSAGE)
 cmake/FindFFTW3.cmake:31 (find_package_handle_standard_args)
 CMakeLists.txt:636 (find_package)


 How can I set the environment variables for FFTW3_INCLUDE_DIR and
 FFTW3_LIBRARIES?

 Those are CMake command-line options.  See the full installation
 instructions
 online, specifically
 http://www.gromacs.org/Documentation/Installation_Instructions#4.4._Helping_CMake_find_the_right_libraries.2fheaders.2fprograms

 Is there any reason you are installing outdated versions of Gromacs and
 FFTW?

 -Justin

 can I add my FFTW installed path to CMakeLists.txt file in the
 related section in below? how?

 if(${GMX_FFT_LIBRARY} STREQUAL FFTW3)
 #MESSAGE(STATUS Using external FFT library - fftw3)
  if(GMX_DOUBLE)
  find_package(FFTW3 REQUIRED)
  include_directories(${FFTW3_INCLUDE_DIR})
  set(FFT_LIBRARIES ${FFTW3_LIBRARIES})
  set(PKG_FFT fftw3)
  else(GMX_DOUBLE)
  find_package(FFTW3F REQUIRED)
  include_directories(${FFTW3F_INCLUDE_DIR})
  set(FFT_LIBRARIES ${FFTW3F_LIBRARIES})
  set(PKG_FFT fftw3f)
  endif(GMX_DOUBLE)


 Thank you in advance
 Hassan


 --
 ==

 Justin A. Lemkul, Ph.D.
 Ruth L. Kirschstein NRSA Postdoctoral Fellow

 Department of Pharmaceutical Sciences
 School of Pharmacy
 Health Sciences Facility II, Room 601
 University of Maryland, Baltimore
 20 Penn St.
 Baltimore, MD 21201

 jalem...@outerbanks.umaryland.edu | (410) 706-7441
 http://mackerell.umaryland.edu/~jalemkul

 ==
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[gmx-users] Combine parts

2014-02-25 Thread Hassan Aaryapour
Dear Gmx-user;
How can I combine parts of my simulation after final MD? The results of my
MD are splitted to several parts with .tgz format.

Best Regards

Hassan
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