Re: [gmx-users] Inconsistency of multicore simulations in Gromacs 4.5.3

2015-03-16 Thread Mark Abraham
Hi,

What do you mean by exactly the same? MD is chaotic, and unless you run
mdrun in its reproducible mode, you will not get reproducibility of a
trajectory. gmxcheck may help you discover what you have actually got.

And you might want to upgrade such a prehistoric version of GROMACS ;-)

Mark

On Mon, Mar 16, 2015 at 10:49 PM, Fei Zhang f...@vt.edu wrote:

 Dear all,

 Sorry to interrupt.

 I encountered a problem while using Gromacs 4.5.3 with mpi to simulate
 ionic liquid constrained between two constant charged electrodes. However
 when I use 1 core and 32 cores to run same simulation (with same .tpr
 file), the charge density distribution of the first 3000 steps are exactly
 the same, however later, in about 1 steps, the charge density
 distribution of 32 cores and 1 core become different.

 The compiling environment is: 1) gcc/4.7.22) openmpi/1.6.43)
 fftw/3.3.4(double precision).

 I am quite confused about it and wonder if anyone else has encountered the
 same problem.

 Best Regards,

 Fei
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[gmx-users] Inconsistency of multicore simulations in Gromacs 4.5.3

2015-03-16 Thread Fei Zhang
Dear all,

Sorry to interrupt.

I encountered a problem while using Gromacs 4.5.3 with mpi to simulate
ionic liquid constrained between two constant charged electrodes. However
when I use 1 core and 32 cores to run same simulation (with same .tpr
file), the charge density distribution of the first 3000 steps are exactly
the same, however later, in about 1 steps, the charge density
distribution of 32 cores and 1 core become different.

The compiling environment is: 1) gcc/4.7.22) openmpi/1.6.43)
fftw/3.3.4(double precision).

I am quite confused about it and wonder if anyone else has encountered the
same problem.

Best Regards,

Fei
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Re: [gmx-users] Forcefield parameters for Zinc

2015-03-16 Thread Leandro Bortot
Hi Emma,

 Just sharing some experience here: I tried to use the AMBER99SB-ILDN
forcefield, which has the same Zn parameter as AMBER99SB, for simulating a
Zn-binding protein and it was actually not possible to study the Zn-binding
process.
 This happens essentially because it is not a good approximation to
consider Zn2+ as a charged sphere and expect it to bind strongly to CysH,
or even Cys-, and to His during the simulations because these are not
simple charge-charge interactions.


 Some approaches for better results are to use a tetrahedral model for
zinc (Cationic Dummy Atom Approach), use His-Zn and Cys-Zn bonding
parameters or to perform QM/MM.
 I don't know about the tetrahedral model, but using bonding parameters
will certainly ensure the bonded state. I believe you can find such
parameters for AMBER99SB in the literature.


I hope it helps,
Leandro.



On Mon, Mar 16, 2015 at 9:59 AM, Emma A emma.ahlstr...@lnu.se wrote:

 Piggot T. T.Piggot@... writes:

 
  Hi Mike,
 
  As well as the link that Bipin sent, you can also get parameters for
 GROMOS phosphorylated residues
  (compatible with the 43A1 force field, I think) from:
 
  http://www.gromacs.org/Downloads/User_contributions/Force_fields
 
  I've never used either so have no idea which might be better. The ones
 that Binpin suggested look like they
  work with the newer GROMOS 54A7 force field, so they might be the ones to
 use.
 
  On your other question, I am not sure about the protein-zinc parameters
 with a GROMOS force field. I would
  say, is there any particular need for using one of the GROMOS protein
 force fields? There are definitely
  parameters out there for some of the all-atom protein force fields (e.g.
 AMBER ones) which are probably
  also better in terms of protein parameters.
 
  Cheers
 
  Tom
 
  PS: Hope things are good in the (relatively) new job!
  
  From: gromacs.org_gmx-users-bounces@...
  [gromacs.org_gmx-users-bounces@...] on behalf
  of Michael Carter [Michael.Carter@...]
  Sent: 20 August 2014 12:56
  To: gmx-users@...
  Subject: Re: [gmx-users] Forcefield parameters for Zinc and
 phosphorylated
 residues
 
  Hi Bipin,
 
  Thanks for this. It works well for adding functionality to residues.
 
  Cheers,
  Mike Carter
 
  On 20/08/2014 12:10, bipin singh bipinelmat@... wrote:
 
  This might help.
  
  http://vienna-ptm.univie.ac.at/
  
  
  
  *Thanks and Regards,Bipin Singh*
  
  
  
  On Wed, Aug 20, 2014 at 4:30 PM, Michael Carter Michael.Carter@...
  wrote:
  
   Hi,
  
   I have two questions regarding the parameterisation of Zinc ions and a
   phosphorylated TYR residue within two different protein systems.
  
  
1.  Zinc parameters:
  
   I have three zinc ions within one protein system. I want to use a
 bonded
   model so that they do not fly out of my protein upon simulation. Is
  there
   any documentation on the parameters for such a model in the GROMOS
   forcefield?
  
   2. Phosphorylated TYR
  
   In another system I have a phosphorylated TYR residue. PDB2GMX does
 not
   like this and after looking inot the manual I have found that you can
  add
   parameters for this to the existing forcefields. Much like the
 previous
   question, is there any documentation on the addition of parameters for
   phosphorylated residues in the GROMOS forcefield?
  
   Any pointers for these questions would be greatly appreciated.
  
   Cheers,
   Mike Carter
  
   The Institute of Cancer Research: Royal Cancer Hospital, a charitable
   Company Limited by Guarantee, Registered in England under Company No.
   534147 with its Registered Office at 123 Old Brompton Road, London SW7
  3RP.
  
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Re: [gmx-users] Problem in making index.ndx and disres.itp

2015-03-16 Thread Tushar Ranjan Moharana
Hi Justine,
As you can see in my .itp file the atom number starts from 1. Even this is
the case with index file. I tried to modify index file to have atomic
number same as pdb file but it gave a blank output. So my first concern is
how GROMACS will know which atom I want to restrain? shall I change the
atom number in itp file to corresponding atom number in pdb?
My second concern is the second line of my .itp file looks different from
the one given in GROMACS website
As per GROMACS website:

; ai aj type index type’ low up1 up2 fac

  in my generated itp:

; i  j ? label  funct loup1up2 weight

So what do you suggest me to do?

Thanks in advance.
-- 
Tushar Ranjan Moharana
B. Tech, NIT Warangal
Ph D Student, CCMB
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Re: [gmx-users] error in grompp : No such molecule type Protein

2015-03-16 Thread Justin Lemkul



On 3/16/15 6:35 AM, Antara mazumdar wrote:

Hi,
I am trying to minimise a coarse grained system having DOPC lipid bilayer,
a dimeric protein and water. The mdp file has DOPC, Protein and W as
coupling groups and my topology file also mentions the number of each
correctly. However while running grompp i am getting No such molecule type
Protein error.



Either the [moleculetype] name is not Protein or you've broken the topology 
format somehow such that it cannot be correctly parsed.


-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] question about g_bundle

2015-03-16 Thread BIRD
dear all
i want calculate crossing angle of two helix in membrane, and use g_bundle.‍
but the -na command i do not know what the exact mean.
how could i define the -na for calculate the crossing angle of two helix at 
X-axis?‍
thanks a lot.
Cao
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[gmx-users] error in grompp : Something is wrong in the coordinate formatting of file system.gro

2015-03-16 Thread Antara mazumdar
Hi,
I am trying to minimise a coarse grained system having DOPC lipid bilayer,
a dimeric protein and water. The mdp file has DOPC, Protein and W as
coupling groups and my topology file also mentions the number of each
correctly. However while running grompp i am getting *Something is wrong in
the coordinate formatting of file system.gro* error. No such molecule type
error does not come now.

-- 

*Best,*
*Antara*

--
J.R.F.(Project)
Systems Biology Group
CSIR - Institute of Genomics  Integrative Biology
South Campus, New Delhi-110020
M:+91-9717970040
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Re: [gmx-users] KALP-15 in DPPC tutorial

2015-03-16 Thread Justin Lemkul



On 3/16/15 12:08 AM, BAOLIN HUANG wrote:

Hi All, I am doing the GROMACS Tutorial of KALP-15 in DPPC. Now, I get stuck
at Note how many lipids were deleted and update the [ molecules ] directive
of your topology accordingly. Run energy minimization. Then, scale down the
lipids by a factor of 0.95 (assuming you have used default names, the result
of the minimization is called confout.gro): perl inflategro.pl confout.gro
0.95 DPPC 0 system_shrink1.gro 5 area_shrink1.dat

The command line was gmx grompp -f minim.mdp -c system_inflated.gro -p
topol.top -o em.tpr. And I got Fatal error: number of coordinates in
coordinate file (system_inflated.gro, 6438) does not match topology
(topol.top 888444) I tried to add DPPC 128 in the [ molecules ], however, I


You should never, at any point, have 888444 atoms in the system.  Likely you've 
added water to the inflated system.  Don't.



got Fatal error: No such moleculetype DPPC.

How to update the [molecules] in topol.top? And how do I know the number of
molecules?



You start with 128, InflateGRO prints out how many it removes...then use a text 
editor.


-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] error in grompp : No such molecule type Protein

2015-03-16 Thread Antara mazumdar
Hi,
I am trying to minimise a coarse grained system having DOPC lipid bilayer,
a dimeric protein and water. The mdp file has DOPC, Protein and W as
coupling groups and my topology file also mentions the number of each
correctly. However while running grompp i am getting No such molecule type
Protein error.

-- 

*Best,*
*Antara*

--
J.R.F.(Project)
Systems Biology Group
CSIR - Institute of Genomics  Integrative Biology
South Campus, New Delhi-110020
M:+91-9717970040
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Re: [gmx-users] g_dist

2015-03-16 Thread Justin Lemkul



On 3/16/15 6:43 AM, RINU KHATTRI wrote:

hello everyone

I am working on protein complex with popc membrane gromcs version is 4.5.5
i want to calculate the distance between two residues during the
simulation (200ns) i have been made the .ndx file of atoms of two
residues and concatenate .xtc file and final .tpr file

g_dist -f full.xtc -s final.tpr -n atom.ndx -o dist.xvg

Molecule in topology has atom numbers below and above natoms (3893).
You are probably trying to use a trajectory which does not match the
first 3893 atoms of the run input file.
You can make a matching run input file with tpbconv.

the indx file is having the atom no which are present in last.gro file

kindly help


So what does gmxcheck tell you about the contents of the .tpr and the .xtc? 
Likely you have a mismatch in what you saved to the trajectory either in the run 
or when using trjconv at some point.


-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] error in grompp : Something is wrong in the coordinate formatting of file system.gro

2015-03-16 Thread Justin Lemkul



On 3/16/15 7:12 AM, Antara mazumdar wrote:

Hi,
I am trying to minimise a coarse grained system having DOPC lipid bilayer,
a dimeric protein and water. The mdp file has DOPC, Protein and W as
coupling groups and my topology file also mentions the number of each
correctly. However while running grompp i am getting *Something is wrong in
the coordinate formatting of file system.gro* error. No such molecule type
error does not come now.



So now, instead of having a broken topology (or maybe grompp never even gets 
that far), you've altered the coordinate file in some way that the format is 
broken.  Without knowing what you're doing or why you're doing it (usually 
there's no reason to play with the contents of a .gro file manually), there's 
nothing to say here.


-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] Problem in making index.ndx and disres.itp

2015-03-16 Thread Justin Lemkul



On 3/16/15 4:36 AM, Tushar Ranjan Moharana wrote:

Hi everyone,
I wanted to run a distance restricted MD. Since I have many atoms I can't
do it manually with a text editor. For that I choose the line corresponding
the atom from .pdb file to another text file and rename them as disres.pdb.
Then I run the following command to generate disres.itp
  *gmx genrestr -f disres.pdb -disre -o disres.itp*
I got the following out put Which I don't think correct. Please rectify my
mistakes


Why don't you think it's correct?

-Justin


My disres.pdb file
ATOM936  CG  ASP61 -36.433   1.944  57.629  0.7994
1.700   C
ATOM937  OD1 ASP61 -37.626   1.784  58.005 -0.8014
1.500   O
ATOM938  OD2 ASP61 -35.856   3.065  57.600 -0.8014
1.500   O
ATOM   1212  CD2 HIS81 -41.384   3.133  58.251 -0.1141
1.700   C
ATOM   1208  CE1 HIS81 -41.090   2.008  60.045 -0.0170
1.700   C
ATOM   1211  HE2 HIS81 -39.455   3.044  59.220  0.3911
1.300   H
ATOM   1295  CD2 HIS87 -38.577   6.571  57.666  0.1292
1.700   C
ATOM   1292  CE1 HIS87 -39.069   5.316  56.005  0.2057
1.700   C
ATOM   1294  NE2 HIS87 -39.012   5.303  57.324 -0.5727
1.550   N
ATOM   3657  CG  ASP   238 -37.842   3.869  61.472  0.7994
1.700   C
ATOM   3658  OD1 ASP   238 -37.982   2.630  61.652 -0.8014
1.500   O
ATOM   3659  OD2 ASP   238 -37.595   4.399  60.357 -0.8014
1.500   O
END
My disres.itp file






































































*; distance restraints for SideChain of [ distance_restraints ];   i j
? label  funct loup1up2 weight1 2
1 0  1   0.026104   0.226104 1.2261  11 3
1 1  1  0.0261116   0.2261121.22611  11 4
1 2  1   0.412962   0.6129621.61296  11 5
1 3  1   0.424679   0.6246791.62468  11 6
1 4  1 0.2588 0.4588 1.4588  11 7
1 5  1   0.409973   0.6099731.60997  11 8
1 6  10.357780.557781.55778  11 9
1 7  1   0.324584   0.5245841.52458  1110
1 8  1   0.352323   0.5523231.55232  1111
1 9  1   0.336515   0.5365151.53652  1112
110  1   0.284958   0.4849581.48496  12 3
111  1   0.122214   0.3222141.32221  12 4
112  1   0.300036   0.5000361.50004  12 5
113  10.302630.502631.50263  12 6
114  1   0.153161   0.3531611.35316  12 7
115  1   0.389231   0.5892311.58923  12 8
116  1   0.330781   0.5307811.53078  12 9
117  1   0.284293   0.4842931.48429  1210
118  1   0.305142   0.5051421.50514  1211
119  1   0.276073   0.4760731.47607  1212
120  1   0.251726   0.4517261.45173  13 4
121  1   0.456662   0.6566621.65666  13 5
122  1   0.487282   0.6872821.68728  13 6
123  1   0.294685   0.4946851.49469  13 7
124  10.343850.543851.54385  13 8
125  10.323490.523491.52349  13 9
126  1   0.287881   0.4878811.48788  1310
127  1   0.342527   0.5425271.54253  1311
128  10.359650.559651.55965  1312
129  1   0.252203   0.452203 1.4522  14 5
130  1   0.113787   0.3137871.31379  14 6
131  1   0.116054   0.3160541.31605  14 7
132  1   0.347675   0.5476751.54768  14 8
133  1   0.289477   0.4894771.48948  14 9
134  1   0.234584   0.4345841.43458  1410
135  1   0.384379   0.5843791.58438  1411
136  1   0.383668   0.5836681.58367  1412
137  1   0.351603   0.551603 1.5516  15 6
138  1   0.110408   0.3104081.31041  15 7
139  1   0.472676   0.6726761.67268  15 8
140  1   0.459901   0.659901 1.6599  15 9
141  1   0.375173   0.5751731.57517  1510
142  1   0.300614   0.5006141.50061  1511
143  1   0.255373   0.4553731.45537  1512
144  1   

Re: [gmx-users] Forcefield parameters for Zinc

2015-03-16 Thread Emma A
Piggot T. T.Piggot@... writes:

 
 Hi Mike,
 
 As well as the link that Bipin sent, you can also get parameters for 
GROMOS phosphorylated residues
 (compatible with the 43A1 force field, I think) from:
 
 http://www.gromacs.org/Downloads/User_contributions/Force_fields
 
 I've never used either so have no idea which might be better. The ones 
that Binpin suggested look like they
 work with the newer GROMOS 54A7 force field, so they might be the ones to 
use.
 
 On your other question, I am not sure about the protein-zinc parameters 
with a GROMOS force field. I would
 say, is there any particular need for using one of the GROMOS protein 
force fields? There are definitely
 parameters out there for some of the all-atom protein force fields (e.g. 
AMBER ones) which are probably
 also better in terms of protein parameters.
 
 Cheers
 
 Tom
 
 PS: Hope things are good in the (relatively) new job!
 
 From: gromacs.org_gmx-users-bounces@...
 [gromacs.org_gmx-users-bounces@...] on behalf
 of Michael Carter [Michael.Carter@...]
 Sent: 20 August 2014 12:56
 To: gmx-users@...
 Subject: Re: [gmx-users] Forcefield parameters for Zinc and phosphorylated 
residues
 
 Hi Bipin,
 
 Thanks for this. It works well for adding functionality to residues.
 
 Cheers,
 Mike Carter
 
 On 20/08/2014 12:10, bipin singh bipinelmat@... wrote:
 
 This might help.
 
 http://vienna-ptm.univie.ac.at/
 
 
 
 *Thanks and Regards,Bipin Singh*
 
 
 
 On Wed, Aug 20, 2014 at 4:30 PM, Michael Carter Michael.Carter@...
 wrote:
 
  Hi,
 
  I have two questions regarding the parameterisation of Zinc ions and a
  phosphorylated TYR residue within two different protein systems.
 
 
   1.  Zinc parameters:
 
  I have three zinc ions within one protein system. I want to use a 
bonded
  model so that they do not fly out of my protein upon simulation. Is
 there
  any documentation on the parameters for such a model in the GROMOS
  forcefield?
 
  2. Phosphorylated TYR
 
  In another system I have a phosphorylated TYR residue. PDB2GMX does not
  like this and after looking inot the manual I have found that you can
 add
  parameters for this to the existing forcefields. Much like the previous
  question, is there any documentation on the addition of parameters for
  phosphorylated residues in the GROMOS forcefield?
 
  Any pointers for these questions would be greatly appreciated.
 
  Cheers,
  Mike Carter
 
  The Institute of Cancer Research: Royal Cancer Hospital, a charitable
  Company Limited by Guarantee, Registered in England under Company No.
  534147 with its Registered Office at 123 Old Brompton Road, London SW7
 3RP.
 
  This e-mail message is confidential and for use by the addressee only.
 If
  the message is received by anyone other than the addressee, please
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  the message to the sender by replying to it and then delete the message
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Hi,
Related to the Zn-parameters; where can I find the reference (author, 
journal, year) to the sigma and epsilon (1.95998e-01  5.23000e-02) 
parameters that I find in /gromacs/top/amber99sb.ff/ffnonbonded.itp for [ 
atomtypes ] Zn.

I would like to use amber99sb force field in my Gromacs simulation of a Zn-
containing protein.

Best regards,
Emma 

+
Join us for an exciting international meeting in Kalmar -  

Re: [gmx-users] umbrella sampling tutorial

2015-03-16 Thread Justin Lemkul



On 3/15/15 9:57 PM, Ming Tang wrote:

Dear Justin,

I have tried many cases, and only your code runs smoothly. If I set 
pull-ngroups = 1, it will warn that pull-group2-name= Chain_A has not been 
defined.
The code you gave me last time runs well. Though the COM between Chain_A and 
Chain_B remains the same over time, I found that Chain_A does dissociate from 
the structure and some particles fly away.


It's the same, but things move apart?  Sorry, this doesn't make sense to me.  Do 
the .mdp settings I provided before recover the behavior of the SMD portion of 
the tutorial or not?



I am trying from the beginning once again and hope to find the reason. Besides, 
I got another problem. I want to probe the mechanical properties of a triple 
helix.
I tried to fix one side (End) and pull the other side using the umbrella method:

; freeze groups
freezegrps  = End
freezedim   = Y Y Y

; COM pulling
pull= umbrella
pull-geometry   = distance
pull-dim= Y N N
pull-start  = yes
pull-ngroups= 2
pull-ncoords= 1
pull-coord1-groups  = 1 2
pull-group1-name= End
pull-group2-name= pull
pull-coord1-rate= 0.005
pull-coord1-k   = 1000

WARNING: Listed nonbonded interaction between particles 179 and 190 at distance 
inf which is larger than the table limit 2.437 nm.

This is likely either a 1,4 interaction, or a listed interaction inside
a smaller molecule you are decoupling during a free energy calculation.
Since interactions at distances beyond the table cannot be computed,
they are skipped until they are inside the table limit again. You will
only see this message once, even if it occurs for several interactions.

IMPORTANT: This should not happen in a stable simulation, so there is
probably something wrong with your system. Only change the table-extension
distance in the mdp file if you are really sure that is the reason.



I'd venture a guess here that your system is probably blowing up because you're 
tugging on one molecule, which reaches a limit, distorts, and the simulation fails.



If I just fix one of the three dimensions, it can run around 100 steps. Then, I 
turned to use SMD method to pull the triple helix along x direction. I tried 
the following method to generate the box, but got a fatal error.
editconf -f complex.gro -o newbox.gro -c -d 1
editconf -f complex.gro -o newbox.gro -center 5.63865 1.8837 1.9762 -box 20 3.8 
4.0

; freeze groups
freezegrps  = End
freezedim   = Y Y Y

; COM pulling.
pull= umbrella
pull-geometry   = direction-periodic
pull-start  = yes
pull-ngroups= 2
pull-ncoords= 1
pull-coord1-groups  = 1 2
pull-group1-name= End
pull-group2-name= pull
pull-coord1-rate= 0.01
pull-coord1-k   = 1000
pull-coord1-vec = 1 0 0

Fatal error:
Can not have dynamic box while using pull geometry 'direction-periodic' (dim x)

Could you teach me how can I build a fixed box? And is my SMD code right?



This means you can't use pressure coupling in the direction along which you're 
pulling.  Use NVT or align the system such that you are pulling along z, in 
conjunction with semiisotropic coupling and zero compressibility along z.


-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

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[gmx-users] g_dist

2015-03-16 Thread RINU KHATTRI
hello everyone

I am working on protein complex with popc membrane gromcs version is 4.5.5
i want to calculate the distance between two residues during the
simulation (200ns) i have been made the .ndx file of atoms of two
residues and concatenate .xtc file and final .tpr file

g_dist -f full.xtc -s final.tpr -n atom.ndx -o dist.xvg

Molecule in topology has atom numbers below and above natoms (3893).
You are probably trying to use a trajectory which does not match the
first 3893 atoms of the run input file.
You can make a matching run input file with tpbconv.

the indx file is having the atom no which are present in last.gro file

kindly help
 g_mindist, g_hbond is working
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Re: [gmx-users] A jump in potential just after extension

2015-03-16 Thread Justin Lemkul



On 3/16/15 4:45 AM, Faezeh Pousaneh wrote:

Hi,

I am almost new in Gromacs, I searched about my problem but did not
find anything. Can someone please help me?

I extend my simulation with same node on same machine, but when I check
g_energy I find a sharp jump in potential, why is that so?. (for
example if before
the extension the average value of potential were X, just as soon as
extension starts the average jumps to Y.)

my run command:

aprun  -n 1   tpbconv_mpi -s production.tpr -extend 10 -o production.tpr
aprun-n 224  mdrun_mpi -s production.tpr  -cpi state.cpt -c
production.gro



Please post the contents of your original .mdp file.  This issue has come up 
before in very specific cases.  Which version of GROMACS are you using?


Is it related to http://redmine.gromacs.org/issues/1640 ?

-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] A jump in potential just after extension

2015-03-16 Thread Faezeh Pousaneh
Dear Justin,

I use gromacs/4.6.7. Below is my .mdp file. No that is not similar to my
case, I do not change any setting for the extension. (I should add that
despite strange jump in potential in g_energy, the trajectory goes in a
direction which I expect.)

PRODUCTIOn
 integrator= md
 dt= 0.002
 nsteps= 5000
 nstxout   = 1   ; save coordinates every  ps
 nstvout   = 1   ; save velocities every ps
 nstlog = 1   ; update log file every
 nstenergy   = 1   ; save energies every
 nstxtcout= 10 ; Output frequency for xtc file
 xtc-precision  = 10 ; precision for xtc file
 ns_type   = grid; search neighboring grid cells
 nstlist   = 5;  fs
 pbc   = xyz ; 3-D PBC
 rlist   = 1.2 ; short-range neighborlist cutoff (in nm)
 rcoulomb   = 1.2 ; short-range electrostatic cutoff (in nm)
 rvdw = 1.2 ; short-range van der Waals cutoff (in nm)
 coulombtype = PME ; Particle Mesh Ewald for long-range
electrostatics
 pme_order = 4   ; cubic interpolation
 fourierspacing= 0.16; grid spacing for FFT
 vdw-type= Cut-off
 Tcoupl= v-rescale   ; modified Berendsen thermostat
 tc-grps = LUT SOL ; two coupling groups - more
accurate
 tau_t   = 0.1   0.1  ; time constant, in ps
 ref_t= 380.   380. ; reference
temperature, one for each group, in K
 ;tc-grps   = system
 energygrps = LUT SOL
 Pcoupl= Parrinello-Rahman
 Pcoupltype  = Isotropic
 tau_p   = 1.0
 compressibility = 4.5e-5
 ref_p= 1.0
 gen_vel= no
 gen_temp= 380.0
 gen_seed= 712349
 DispCorr  = EnerPres; account for cut-off vdW
scheme
 constraints  = all-bonds ; all bonds constrained (fixed
length)
 continuation  = yes ; Restarting after NPT
 constraint-algorithm  = lincs   ; holonomic constraints
 lincs_iter= 1 ; accuracy of LINCS
 lincs_order= 4 ; also related to accuracy
**


Best regards


On Mon, Mar 16, 2015 at 12:31 PM, Justin Lemkul jalem...@vt.edu wrote:



 On 3/16/15 4:45 AM, Faezeh Pousaneh wrote:

 Hi,

 I am almost new in Gromacs, I searched about my problem but did not
 find anything. Can someone please help me?

 I extend my simulation with same node on same machine, but when I check
 g_energy I find a sharp jump in potential, why is that so?. (for
 example if before
 the extension the average value of potential were X, just as soon as
 extension starts the average jumps to Y.)

 my run command:

 aprun  -n 1   tpbconv_mpi -s production.tpr -extend 10 -o
 production.tpr
 aprun-n 224  mdrun_mpi -s production.tpr  -cpi state.cpt -c
 production.gro


 Please post the contents of your original .mdp file.  This issue has come
 up before in very specific cases.  Which version of GROMACS are you using?

 Is it related to http://redmine.gromacs.org/issues/1640 ?

 -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 fix the center of mass of the three N-terminal atoms in a triple helix?

2015-03-16 Thread Ming Tang
Deer all,
I am trying to use the steered molecular dynamic method to study a triple helix.
According to a paper, it can be done through fixing the COM of the three 
terminal by means of a strong harmonic
restrain with a super large spring constant, and pull the C-terminal by an 
appropriate spring constant in Gromos96 53a6.
But I still do not know how to keep the COM fixed.
Could anybody give me same guidance?

Thanks a lot,
Ming
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[gmx-users] Postdoc positions available at IBM (bio-molecular modeling and MD)

2015-03-16 Thread Payel Das
Dear all, 

IBM Thomas J. Watson Research Center located in Yorktown Heights, NY 
expects to immediately hire three Postdoctoral Fellows in the Soft Matter 
Science Group, Computational Biology Center.  To view the job description 
and apply, please visit the following link: 
https://jobs3.netmedia1.com/cp/faces/job_summary?job_id=RES-0731149. For 
more information, please contact Dr. Payel Das da...@us.ibm.com.

--
Payel Das, Ph.D.
Research Staff Scientist
Soft Matter Theory and Simulations Group
Computational Biology Center
IBM Thomas J. Watson Research Center
Yorktown Heights, NY 10598
Ph:914-945-2373
Webpage: https://researcher.ibm.com/researcher/view.php?person=us-daspa
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[gmx-users] Error while shrinking lipids (KALP15 in DPPC tutorial)

2015-03-16 Thread Thomas Lipscomb
Dear gmx-users,
I am repeating the KALP15 in DPPC tutorial using Maximin 3 in DPPC using the 
CHARMM36 forcefield.  I think the lipid shrinking was a step I did badly last 
time (I think I was getting can open em.tpr but not open em1.tpr, em2.tpr, 
etc.), which might be why that run had poor lipid packing.
This is the page of the tutorial I am stuck 
at:http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/membrane_protein/03_solvate.html
The KALP15 in DPPC tutorial says to scale down the lipids by 0.95 for 26 times. 
 So I repeated this group of 3 commands 26 times:/usr/local/gromacs/bin/gmx 
grompp -f minim.mdp -c system_shrink1.gro -p topol.top -o 
em.tpr/usr/local/gromacs/bin/gmx mdrun -s em.tpr -vperl inflategro.pl 
confout.gro 0.95 DPPC 0 system_shrink1.gro 5 area_shrink1.dat
I am not sure what file to check to make sure doing that is right.  I hope it 
is.
Anyway I also tried:
cp em.tpr em1.tpr
/usr/local/gromacs/bin/gmx grompp -f minim.mdp -c system_shrink1.gro -p 
topol.top -o em1.tpr/usr/local/gromacs/bin/gmx mdrun -s em1.tpr -vperl 
inflategro.pl system_shrink1.gro 0.95 DPPC 0 system_shrink2.gro 5 
area_shrink2.datcp em1.tpr em2.tpr
/usr/local/gromacs/bin/gmx grompp -f minim.mdp -c system_shrink2.gro -p 
topol.top -o em2.tpr/usr/local/gromacs/bin/gmx mdrun -s em2.tpr -vperl 
inflategro.pl system_shrink2.gro 0.95 DPPC 0 system_shrink3.gro 5 
area_shrink3.datcp em2.tpr em3.tpr
etc.
But then I got this error I have never seen 
before:---
Program gmx, VERSION 5.0.1Source code file: 
/home/tlipscomb/gromacs-5.0.1/src/gromacs/gmxpreprocess/gmxcpp.c, line: 311
Fatal error:Topology include file gb.itp not foundFor more information and 
tips for troubleshooting, please check the GROMACSwebsite at 
http://www.gromacs.org/Documentation/Errors---
Line 311 is the contents of this if statement

    if (!cpp-fn)    {        gmx_fatal(FARGS, Topology include file \%s\ 
not found, filenm);    }
Sincerely,Thomas
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Re: [gmx-users] gmx rmsdist: rmsmax vs. rmscmax

2015-03-16 Thread Alan Manning

Hi, thanks for the reply.

I now have another question regarding the the rmsdist tool: I'm confused 
why my rmsmax value seems so small. Right now I am simulating a box of 
water only. I'd like to get a matrix of all the atom-atom distances for 
a single frame in my simulation, so use the following command:


gmx rmsdist -f nvt.trr -s nvt.tpr -mean -nosumh -b 100 -e 100

However, this gives an rmsmax = 0.000345129, which is smaller than a 
water molecule, and Im not sure why.


I'm also curious why I need to supply a topology file if all I want to 
calculate is the interactomic distances. I'm likely misunderstanding 
this tool... Thanks in advance for the help.


Regards,
Alan Manning



On 03/16/15 04:24, Justin Lemkul wrote:



On 3/15/15 6:36 PM, Alan Manning wrote:

Hi

What is the difference between the rmsmax and rmscmax values
written to the
screen when running gmx rmsdist? Thanks.



rmscmax is scaled by dividing by the mean (sc for scaled,
presumably).  See calc_rmsd() in gmx_rmsdist.c

-Justin


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Re: [gmx-users] KALP-15 in DPPC tutorial

2015-03-16 Thread RINU KHATTRI
check your popc128.top
or topol.top file
 ; Include POPC chain topology
#include popc.itp

and
; Include water topology
#include gromos53a6_lipid.ff/spc.itp
and always update the no of atoms in you .gro file

On Mon, Mar 16, 2015 at 10:31 AM, RINU KHATTRI nickname.mi...@gmail.com wrote:
 firstly go back to check your system.gro file which you made bu cat
 DPPC.gro new_box.gro system.gro
 remove some line between the merging of two file update the no of atoms
 then do your next step


 On Mon, Mar 16, 2015 at 9:38 AM, BAOLIN HUANG baolin.hu...@qut.edu.au wrote:
 Hi All,
 I am doing the GROMACS Tutorial of KALP-15 in DPPC.
 Now, I get stuck at Note how many lipids were deleted and update the [ 
 molecules ] directive of your topology accordingly. Run energy minimization. 
 Then, scale down the lipids by a factor of 0.95 (assuming you have used 
 default names, the result of the minimization is called confout.gro): perl 
 inflategro.pl confout.gro 0.95 DPPC 0 system_shrink1.gro 5 area_shrink1.dat

 The command line was gmx grompp -f minim.mdp -c system_inflated.gro -p 
 topol.top -o em.tpr. And I got Fatal error: number of coordinates in 
 coordinate file (system_inflated.gro, 6438) does not match topology 
 (topol.top 888444) I tried to add DPPC 128 in the [ molecules ], however, I 
 got Fatal error: No such moleculetype DPPC.

 How to update the [molecules] in topol.top? And how do I know the number of 
 molecules?



 Kind regards,

 Alex Huang



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Re: [gmx-users] gmx rmsdist: rmsmax vs. rmscmax

2015-03-16 Thread Justin Lemkul



On 3/15/15 6:36 PM, Alan Manning wrote:

Hi

What is the difference between the rmsmax and rmscmax values written to the
screen when running gmx rmsdist? Thanks.



rmscmax is scaled by dividing by the mean (sc for scaled, presumably).  See 
calc_rmsd() in gmx_rmsdist.c


-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] trjconv -center tool

2015-03-16 Thread Mohammad Sirajuddin
Dear users,
i am observing different results for density profile of my system
(comprising of hydrated lipids and buffer molecules in aqueous region) if i
invoked trjconv tool with and without -center tool. There is difference in
the peak height for buffer molecule which are used for centering using
-center tool.

I will be glad if someone figure out the issue and elaborate on how -center
command in trjconv tool works !

-- 
*Regards,*

*Mohammad Sirajuddin.*
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[gmx-users] A jump in potential just after extension

2015-03-16 Thread Faezeh Pousaneh
Hi,

I am almost new in Gromacs, I searched about my problem but did not
find anything. Can someone please help me?

I extend my simulation with same node on same machine, but when I check
g_energy I find a sharp jump in potential, why is that so?. (for
example if before
the extension the average value of potential were X, just as soon as
extension starts the average jumps to Y.)

my run command:

aprun  -n 1   tpbconv_mpi -s production.tpr -extend 10 -o production.tpr
aprun-n 224  mdrun_mpi -s production.tpr  -cpi state.cpt -c
production.gro


thank you in advance,
Best regards
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Re: [gmx-users] problem in defining protonation state of amino acids

2015-03-16 Thread Tushar Ranjan Moharana
Hi Justin,
Thanks for your valuable suggestion. I ignored the hydrogen and added
manually bu -his flag.

Tushar Ranjan Moharana
B. Tech, NIT Warangal
Ph D Student, CCMB
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[gmx-users] Problem in making index.ndx and disres.itp

2015-03-16 Thread Tushar Ranjan Moharana
Hi everyone,
I wanted to run a distance restricted MD. Since I have many atoms I can't
do it manually with a text editor. For that I choose the line corresponding
the atom from .pdb file to another text file and rename them as disres.pdb.
Then I run the following command to generate disres.itp
 *gmx genrestr -f disres.pdb -disre -o disres.itp*
I got the following out put Which I don't think correct. Please rectify my
mistakes
My disres.pdb file
ATOM936  CG  ASP61 -36.433   1.944  57.629  0.7994
1.700   C
ATOM937  OD1 ASP61 -37.626   1.784  58.005 -0.8014
1.500   O
ATOM938  OD2 ASP61 -35.856   3.065  57.600 -0.8014
1.500   O
ATOM   1212  CD2 HIS81 -41.384   3.133  58.251 -0.1141
1.700   C
ATOM   1208  CE1 HIS81 -41.090   2.008  60.045 -0.0170
1.700   C
ATOM   1211  HE2 HIS81 -39.455   3.044  59.220  0.3911
1.300   H
ATOM   1295  CD2 HIS87 -38.577   6.571  57.666  0.1292
1.700   C
ATOM   1292  CE1 HIS87 -39.069   5.316  56.005  0.2057
1.700   C
ATOM   1294  NE2 HIS87 -39.012   5.303  57.324 -0.5727
1.550   N
ATOM   3657  CG  ASP   238 -37.842   3.869  61.472  0.7994
1.700   C
ATOM   3658  OD1 ASP   238 -37.982   2.630  61.652 -0.8014
1.500   O
ATOM   3659  OD2 ASP   238 -37.595   4.399  60.357 -0.8014
1.500   O
END
My disres.itp file






































































*; distance restraints for SideChain of [ distance_restraints ];   i j
? label  funct loup1up2 weight1 2
1 0  1   0.026104   0.226104 1.2261  11 3
1 1  1  0.0261116   0.2261121.22611  11 4
1 2  1   0.412962   0.6129621.61296  11 5
1 3  1   0.424679   0.6246791.62468  11 6
1 4  1 0.2588 0.4588 1.4588  11 7
1 5  1   0.409973   0.6099731.60997  11 8
1 6  10.357780.557781.55778  11 9
1 7  1   0.324584   0.5245841.52458  1110
1 8  1   0.352323   0.5523231.55232  1111
1 9  1   0.336515   0.5365151.53652  1112
110  1   0.284958   0.4849581.48496  12 3
111  1   0.122214   0.3222141.32221  12 4
112  1   0.300036   0.5000361.50004  12 5
113  10.302630.502631.50263  12 6
114  1   0.153161   0.3531611.35316  12 7
115  1   0.389231   0.5892311.58923  12 8
116  1   0.330781   0.5307811.53078  12 9
117  1   0.284293   0.4842931.48429  1210
118  1   0.305142   0.5051421.50514  1211
119  1   0.276073   0.4760731.47607  1212
120  1   0.251726   0.4517261.45173  13 4
121  1   0.456662   0.6566621.65666  13 5
122  1   0.487282   0.6872821.68728  13 6
123  1   0.294685   0.4946851.49469  13 7
124  10.343850.543851.54385  13 8
125  10.323490.523491.52349  13 9
126  1   0.287881   0.4878811.48788  1310
127  1   0.342527   0.5425271.54253  1311
128  10.359650.559651.55965  1312
129  1   0.252203   0.452203 1.4522  14 5
130  1   0.113787   0.3137871.31379  14 6
131  1   0.116054   0.3160541.31605  14 7
132  1   0.347675   0.5476751.54768  14 8
133  1   0.289477   0.4894771.48948  14 9
134  1   0.234584   0.4345841.43458  1410
135  1   0.384379   0.5843791.58438  1411
136  1   0.383668   0.5836681.58367  1412
137  1   0.351603   0.551603 1.5516  15 6
138  1   0.110408   0.3104081.31041  15 7
139  1   0.472676   0.6726761.67268  15 8
140  1   0.459901   0.659901 1.6599  15 9
141  1   0.375173   0.5751731.57517  1510
142  1   0.300614   0.5006141.50061  1511
143  1   0.255373   0.4553731.45537  1512
144  1   0.324609   0.5246091.52461  16 7
145  1   0.295291   0.4952911.49529