Re: [gmx-users] Coordinate file does not match topology

2007-06-10 Thread Yang Ye

On 6/11/2007 4:27 AM, David van der Spoel wrote:

Sheyore Omovie wrote:

Thanks Yang,
Each of the residues in my *.gro have more H-atoms than in *.top. I 
added the 21 H-atoms in [molecules] section of *.top. But grompp 
still came up with the ff error: No such molecule type.

Do i have to edit [moleculetype] section too?
Rgds
John




Please do not edit the topology file unless you are very sure what you 
are doing. You probably select a united atom force field and want to 
combine it with an all atom coordinate file. You will have to use the 
conf.gro that pdb2gmx produces.

Hi, Omovie

Hope David's comment help you to understand what you are doing with the 
step of grompp. No individual H-atom shall exist outside a molecule as 
we are not doing nuclear simulation. =)


Regards,
Yang Ye

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RE: [gmx-users] genion

2007-06-10 Thread Dallas B. Warren
What actually is it that you want to know about?

Your email doesn't really specify anything that you are trying to find out.  
Are you wanting to maybe be able to neutralise the change in a system using 
genion?  Have you looked at the tutorials and checked "genion -h"?


-Original Message-
From: [EMAIL PROTECTED] on behalf of Elias santos
Sent: Sun 6/10/2007 4:21 AM
To: gmx-users@gromacs.org
Subject: [gmx-users] genion
 
Hi!!
I want know because we must neutralize the total load of the system (protein
+ water) in the interior of the box with genion.
Elias

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Re: [gmx-users] Coordinate file does not match topology

2007-06-10 Thread David van der Spoel

Sheyore Omovie wrote:

Thanks Yang,
Each of the residues in my *.gro have more H-atoms than in *.top. I 
added the 21 H-atoms in [molecules] section of *.top. But grompp still 
came up with the ff error: No such molecule type.

Do i have to edit [moleculetype] section too?
Rgds
John




Please do not edit the topology file unless you are very sure what you 
are doing. You probably select a united atom force field and want to 
combine it with an all atom coordinate file. You will have to use the 
conf.gro that pdb2gmx produces.


--
David.

David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  75124 Uppsala, Sweden
phone:  46 18 471 4205  fax: 46 18 511 755
[EMAIL PROTECTED]   [EMAIL PROTECTED]   http://folding.bmc.uu.se

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Re: [gmx-users] Coordinate file does not match topology

2007-06-10 Thread Sheyore Omovie

Thanks Yang,
Each of the residues in my *.gro have more H-atoms than in *.top. I added 
the 21 H-atoms in [molecules] section of *.top. But grompp still came up 
with the ff error: No such molecule type.

Do i have to edit [moleculetype] section too?
Rgds
John



From: Yang Ye <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Sun, 10 Jun 2007 23:02:29 +0800



On 6/10/2007 8:54 PM, Sheyore Omovie wrote:
You're right, the total charge is zero. While creating *.top, pdb2gmx did 
not recognise some hydrogen atoms in my pdb file (HA atom type in 
particular).

I had to use -ignh to ignore the H-atoms.
No. This is not the reason why there are different number of atoms inside 
your .gro and .top. pdb2gmx shall always generate a correct top.
Can I just add this atoms to the *.top like u've stated below, or do I 
need to edit *.rtp to include this particular H-atom.
Check other steps. Or check what's the difference (which type of molecule 
has more number) if you want to find the root of the problem? Or just 
proceed with my suggested modification.

Rgds
John



From: Yang Ye <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Sun, 10 Jun 2007 20:00:47 +0800

There is 2312-2291=21 more atoms in your structure file than in the 
topology file. If it is due to genion, it shall be less. There might be 
other mistakes in previous steps.


Anyway, to make them match, just count how many molecules you have in the 
system. The last section in your top file shall be something like


[ molecules ]
Protein X
SOL X
K+  X

Match the number there. Commands like

grep SOL ABC.gro | wc
or
grep Mg ABC.gro | wc
or
grep POT ABC.gro | wc

shall be your good companion.

Regards,
Yang Ye

On 6/10/2007 8:42 AM, Sheyore Omovie wrote:

Thanks,
But this is my first real simulation, So I'll appreciate it if you can 
tell me how to determine the number of ions to add with genion.

Thanks
John



From: Alan Dodd <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Thu, 7 Jun 2007 23:26:01 -0700 (PDT)

Small errors like that are usually down to things like running genion 
and not changing the .top.  I think I made a problem for myself once 
with non-consecutive atom numbering, too.


- Original Message 
From: Mark Abraham <[EMAIL PROTECTED]>
To: Discussion list for GROMACS users 
Sent: Friday, June 8, 2007 3:48:28 AM
Subject: Re: [gmx-users] Coordinate file does not match topology


Sheyore Omovie wrote:
> Dear gromacs users,
> While trying to preprocess my files with grompp, i got the ff error
> message:
> "Number of coordinates in coordinate file (b4em.gro, 2312) does not
> match topology (twopolypeptide.top, 2291)"
> How can I fix this?

Make them match. Assuming you haven't managed a gross mismatch of 
files,
your [molecules] section of your .top probably isn't right. Chapter 
five

of the manual is your friend here.

Mark
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Re: [gmx-users] tpbconv restart crashing on 3.3.1

2007-06-10 Thread David van der Spoel

Alan Dodd wrote:

Hello all,
A recent simulation has been running on a cluster for a couple of weeks.  
5.something-ns in it crashed due to a hardware glitch.  All perfectly 
understandable so far.
The strange thing is, using tpbconv now results in a .tpr that crashes in the 
first step due to massive LINCS errors.  Even if you use the option -time to 
take the simulation way back, to say 0.5ns when it ought to still be fine, it 
still crashes.  Other simulations on the same hardware+software are running 
fine, other restarts from other jobs crashing at the same time have worked 
fine, so it doesn't look like a bug.  Any suggestions as to why LINCS errors 
could suddenly now prevent the simulation from running *any* of the steps that 
it previously ran just fine?  I just want a hint as to what we could have 
missed, really.

Alan Dodd
UoB

Did you give tpbconv the energy file as well?

--
David.

David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  75124 Uppsala, Sweden
phone:  46 18 471 4205  fax: 46 18 511 755
[EMAIL PROTECTED]   [EMAIL PROTECTED]   http://folding.bmc.uu.se

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Re: [gmx-users] Coordinate file does not match topology

2007-06-10 Thread Yang Ye



On 6/10/2007 8:54 PM, Sheyore Omovie wrote:
You're right, the total charge is zero. While creating *.top, pdb2gmx 
did not recognise some hydrogen atoms in my pdb file (HA atom type in 
particular).

I had to use -ignh to ignore the H-atoms.
No. This is not the reason why there are different number of atoms 
inside your .gro and .top. pdb2gmx shall always generate a correct top.
Can I just add this atoms to the *.top like u've stated below, or do I 
need to edit *.rtp to include this particular H-atom.
Check other steps. Or check what's the difference (which type of 
molecule has more number) if you want to find the root of the problem? 
Or just proceed with my suggested modification.

Rgds
John



From: Yang Ye <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Sun, 10 Jun 2007 20:00:47 +0800

There is 2312-2291=21 more atoms in your structure file than in the 
topology file. If it is due to genion, it shall be less. There might 
be other mistakes in previous steps.


Anyway, to make them match, just count how many molecules you have in 
the system. The last section in your top file shall be something like


[ molecules ]
Protein X
SOL X
K+  X

Match the number there. Commands like

grep SOL ABC.gro | wc
or
grep Mg ABC.gro | wc
or
grep POT ABC.gro | wc

shall be your good companion.

Regards,
Yang Ye

On 6/10/2007 8:42 AM, Sheyore Omovie wrote:

Thanks,
But this is my first real simulation, So I'll appreciate it if you 
can tell me how to determine the number of ions to add with genion.

Thanks
John



From: Alan Dodd <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Thu, 7 Jun 2007 23:26:01 -0700 (PDT)

Small errors like that are usually down to things like running 
genion and not changing the .top.  I think I made a problem for 
myself once with non-consecutive atom numbering, too.


- Original Message 
From: Mark Abraham <[EMAIL PROTECTED]>
To: Discussion list for GROMACS users 
Sent: Friday, June 8, 2007 3:48:28 AM
Subject: Re: [gmx-users] Coordinate file does not match topology


Sheyore Omovie wrote:
> Dear gromacs users,
> While trying to preprocess my files with grompp, i got the ff error
> message:
> "Number of coordinates in coordinate file (b4em.gro, 2312) does not
> match topology (twopolypeptide.top, 2291)"
> How can I fix this?

Make them match. Assuming you haven't managed a gross mismatch of 
files,
your [molecules] section of your .top probably isn't right. Chapter 
five

of the manual is your friend here.

Mark
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[gmx-users] Re: generating a top file

2007-06-10 Thread Yang Ye

Hi, Saf

We use a special bond for heme, specified in specbond.dat. Check the 
mailing list archive.


Regards,
Yang Ye

On 6/10/2007 9:17 PM, Shahrokh Safarian wrote:

Dear Yang YE

Thank you very much for your kind cooperation. I did upload my pdb file
to prodrg but there were two problems:
1) the size of the file was high
2) there was an Fe atom which was not supported by prodrg

In fact I am trying to simulate an iron containing enzyme which dose not
contained of a typical heme group. So, as you know, if we want to have a
good simulation, the Fe3+ ion should be covalently bounded to the
nitrogen atoms of at least two or three His residues until the ion has
not been moved from its initial location in the molecule. Did hoy have
any similar experience before and could you lead me to solve this
problem?

Thanks
saf



  


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Re: [gmx-users] Coordinate file does not match topology

2007-06-10 Thread Sheyore Omovie
You're right, the total charge is zero. While creating *.top, pdb2gmx did 
not recognise some hydrogen atoms in my pdb file (HA atom type in 
particular).

I had to use -ignh to ignore the H-atoms.
Can I just add this atoms to the *.top like u've stated below, or do I need 
to edit *.rtp to include this particular H-atom.

Rgds
John



From: Yang Ye <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Sun, 10 Jun 2007 20:00:47 +0800

There is 2312-2291=21 more atoms in your structure file than in the 
topology file. If it is due to genion, it shall be less. There might be 
other mistakes in previous steps.


Anyway, to make them match, just count how many molecules you have in the 
system. The last section in your top file shall be something like


[ molecules ]
Protein X
SOL X
K+  X

Match the number there. Commands like

grep SOL ABC.gro | wc
or
grep Mg ABC.gro | wc
or
grep POT ABC.gro | wc

shall be your good companion.

Regards,
Yang Ye

On 6/10/2007 8:42 AM, Sheyore Omovie wrote:

Thanks,
But this is my first real simulation, So I'll appreciate it if you can 
tell me how to determine the number of ions to add with genion.

Thanks
John



From: Alan Dodd <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Thu, 7 Jun 2007 23:26:01 -0700 (PDT)

Small errors like that are usually down to things like running genion and 
not changing the .top.  I think I made a problem for myself once with 
non-consecutive atom numbering, too.


- Original Message 
From: Mark Abraham <[EMAIL PROTECTED]>
To: Discussion list for GROMACS users 
Sent: Friday, June 8, 2007 3:48:28 AM
Subject: Re: [gmx-users] Coordinate file does not match topology


Sheyore Omovie wrote:
> Dear gromacs users,
> While trying to preprocess my files with grompp, i got the ff error
> message:
> "Number of coordinates in coordinate file (b4em.gro, 2312) does not
> match topology (twopolypeptide.top, 2291)"
> How can I fix this?

Make them match. Assuming you haven't managed a gross mismatch of files,
your [molecules] section of your .top probably isn't right. Chapter five
of the manual is your friend here.

Mark
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Re: [gmx-users] generating a top file

2007-06-10 Thread Yang Ye

This is called parameterization.
http://wiki.gromacs.org/index.php/Parameterization

For small molecule, you can opt for PRODRG for GROMOS/GROMACS force 
fields; or Antechamber for AMBER force field.
Once you obtained the topology, convert them back to the format in the 
rtp file according to the manual.


Regards,
Yang Ye

On 6/10/2007 7:28 PM, Shahrokh Safarian wrote:

Dear colleagues

As you know if we want to introduce a new molecule into Gromacs, the
related parameters for that molecule (e.g. [atoms], [bonds], [pairs],
[dihedrals] and so on) should be inserted to the Gromacs rtp file. In
the Gromacs user's manual (page 100) an example for these types of
topology parameters is propounded for urea molecule. The main question
is how can we obtain these topology parameters for a desired molecule?

regards
saf

   



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[gmx-users] generating a top file

2007-06-10 Thread Shahrokh Safarian
Dear colleagues

As you know if we want to introduce a new molecule into Gromacs, the
related parameters for that molecule (e.g. [atoms], [bonds], [pairs],
[dihedrals] and so on) should be inserted to the Gromacs rtp file. In
the Gromacs user's manual (page 100) an example for these types of
topology parameters is propounded for urea molecule. The main question
is how can we obtain these topology parameters for a desired molecule?

regards
saf

   


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Re: [gmx-users] Coordinate file does not match topology

2007-06-10 Thread Yang Ye
There is 2312-2291=21 more atoms in your structure file than in the 
topology file. If it is due to genion, it shall be less. There might be 
other mistakes in previous steps.


Anyway, to make them match, just count how many molecules you have in 
the system. The last section in your top file shall be something like


[ molecules ]
Protein X
SOL X
K+  X

Match the number there. Commands like

grep SOL ABC.gro | wc
or
grep Mg ABC.gro | wc
or
grep POT ABC.gro | wc

shall be your good companion.

Regards,
Yang Ye

On 6/10/2007 8:42 AM, Sheyore Omovie wrote:

Thanks,
But this is my first real simulation, So I'll appreciate it if you can 
tell me how to determine the number of ions to add with genion.

Thanks
John



From: Alan Dodd <[EMAIL PROTECTED]>
Reply-To: Discussion list for GROMACS users 
To: Discussion list for GROMACS users 
Subject: Re: [gmx-users] Coordinate file does not match topology
Date: Thu, 7 Jun 2007 23:26:01 -0700 (PDT)

Small errors like that are usually down to things like running genion 
and not changing the .top.  I think I made a problem for myself once 
with non-consecutive atom numbering, too.


- Original Message 
From: Mark Abraham <[EMAIL PROTECTED]>
To: Discussion list for GROMACS users 
Sent: Friday, June 8, 2007 3:48:28 AM
Subject: Re: [gmx-users] Coordinate file does not match topology


Sheyore Omovie wrote:
> Dear gromacs users,
> While trying to preprocess my files with grompp, i got the ff error
> message:
> "Number of coordinates in coordinate file (b4em.gro, 2312) does not
> match topology (twopolypeptide.top, 2291)"
> How can I fix this?

Make them match. Assuming you haven't managed a gross mismatch of files,
your [molecules] section of your .top probably isn't right. Chapter five
of the manual is your friend here.

Mark
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Re: [gmx-users] position by editconf

2007-06-10 Thread David van der Spoel

mahbubeh zarrabi wrote:

dear all
I want to insert protein in bilayer. how can i put
position of protein in x,y, and z ralative to the
bilayer by editconf? 
best regards



editconf -h



 

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[gmx-users] position by editconf

2007-06-10 Thread mahbubeh zarrabi
dear all
I want to insert protein in bilayer. how can i put
position of protein in x,y, and z ralative to the
bilayer by editconf? 
best regards


 

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