RE: [gmx-users] Using editconf to center on 0 0 0 , then using genbox

2007-08-08 Thread Dallas B. Warren
> [I know this seems a little trivial.  I'd like to have my 
> molecule centered at 0 0 0, b/c I'll be collecting 
> coordinates later and it'll just make my math easier.]

You will have to do that centering after the simulation has been run and
the trajectory files written.

Catch ya,

Dr. Dallas Warren
Lecturer
Department of Pharmaceutical Biology and Pharmacology
Victorian College of Pharmacy, Monash University
381 Royal Parade, Parkville VIC 3010
[EMAIL PROTECTED]
+61 3 9903 9524
-
When the only tool you own is a hammer, every problem begins to resemble
a nail.
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Re: [gmx-users] Using editconf to center on 0 0 0 , then using genbox

2007-08-08 Thread Arneh Babakhani
Ok, I don't quite understand something.

My dowloaded pdb file of my molecule is centered at about 3 3 3 (in x y z,
nm).

I perform genbox to solvate it: No problem.

I then perform editconf to translate the center of the molecule to 0 0 0
(and move the water likewise):
editconf -f Molecule_Solv.gro -o Molecule_Solv -translate -3 -3 -3
[Note here, I'm not using the -center option, b/c I want to place the
center of the molecule, not the entire system, at 0 0 0].
No problem here (when I load the structure up in VMD and measure its
geometric center, it is indeed at 0 0 0).

But then, when I run a simulation on this structure (say a brief energy
minimization), it reverts back to its original center at 3 3 3.  In other
words, the outputted structure after the minimization has the molecule
centered back at 3 3 3.  Why is this happening???  Does this have anything
to do with the dimensions of the box? (which are 6 6 6).  The dimensions
are irrespective of the centering of the box, right?

[I know this seems a little trivial.  I'd like to have my molecule
centered at 0 0 0, b/c I'll be collecting coordinates later and it'll just
make my math easier.]

> Arneh Babakhani wrote:
>> Hi,
>>
>> I'm using editconf to center my sytem about the origin (0 0 0).  No
>> problem there.
>>
>> But then when I use genbox to solvate the resulting structure, the
>> solvent
>> is offset (not centered about 0 0 0).   Is there a way to correct this?
>
> Have you tried editconf on the solvated structure? Why does it matter
> anyway?
>
> Mark
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Re: [gmx-users] Using editconf to center on 0 0 0 , then using genbox

2007-08-08 Thread Arneh Babakhani
I'd like to have my structure centered on 0 0 0 .

The solvated structure is completely off.  My protein is at the center,
but the solvation shell is way off center.

I just dont understand why genbox isn't recognizing the previous editconf
step.

Ok, I'll try solvating first then using editconf.


> Arneh Babakhani wrote:
>> Hi,
>>
>> I'm using editconf to center my sytem about the origin (0 0 0).  No
>> problem there.
>>
>> But then when I use genbox to solvate the resulting structure, the
>> solvent
>> is offset (not centered about 0 0 0).   Is there a way to correct this?
>
> Have you tried editconf on the solvated structure? Why does it matter
> anyway?
>
> Mark
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Re: [gmx-users] Using editconf to center on 0 0 0 , then using genbox

2007-08-08 Thread Mark Abraham

Arneh Babakhani wrote:

Hi,

I'm using editconf to center my sytem about the origin (0 0 0).  No
problem there.

But then when I use genbox to solvate the resulting structure, the solvent
is offset (not centered about 0 0 0).   Is there a way to correct this?


Have you tried editconf on the solvated structure? Why does it matter 
anyway?


Mark
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[gmx-users] Using editconf to center on 0 0 0 , then using genbox

2007-08-08 Thread Arneh Babakhani
Hi,

I'm using editconf to center my sytem about the origin (0 0 0).  No
problem there.

But then when I use genbox to solvate the resulting structure, the solvent
is offset (not centered about 0 0 0).   Is there a way to correct this?

Arneh


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