[gmx-users] How to view and analysis the result trajectory of g_covar?

2006-04-24 Thread Shanjie Huang
Hi dear friends,

I just get trajectory files using "g_covar". But how can I view this
.trr file? I tried VMD and gOpenmol, etc and do not work. 

Thanks.


SJ Huang

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[gmx-users] Ligand often slips out from the binding site in MD; is it natural?

2006-03-26 Thread Shanjie Huang
I am doing MD of a ligand-protein complex derivated from docking, but I
found that often the ligand slipped out slowly from the binding pocket.
I then performed some MD simulations of several complex ligand-receptor
complex obtained from PDB database, but no similar phenomena was
watched. 

Is it natural for a ligand to slip from pocket frequently? Or does it
indicate that my complex model derivated from docking is unreasonable?
What should I do? Thanks to all.

Shanjie Huang
 
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[gmx-users] Re: How to generate average C-alpha fluctuation during MD of every AA residue?

2006-03-23 Thread Shanjie Huang
Thanks my friend, I have solve this problem with your kindly help.




> Message: 4
> Date: Thu, 23 Mar 2006 08:56:27 +0100
> From: David van der Spoel <[EMAIL PROTECTED]>
> Subject: Re: [gmx-users] How to generate average C-alpha fluctuation
>   during  MD of every AA residue?
> To: Discussion list for GROMACS users 
> Message-ID: <[EMAIL PROTECTED]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Shanjie Huang wrote:
> > Hi my dear friends,
> > 
> > I just learn to use gromacs this days and I found a lot of figures in
> > research articles that illustrates the average C-alpha fluctuation
> > during MD of every AA residue, which can show very clearly that which
> > part of protein is stable and which is flexible. But I examined the
> > tutor and online manual for every commands yet cannot find the method.
> > Please give me a hand. Thanks a lot.
> > 
> > Shanjie Huang
> g_rmsf
> 
> -- 
> 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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[gmx-users] How to generate average C-alpha fluctuation during MD of every AA residue?

2006-03-22 Thread Shanjie Huang
Hi my dear friends,

I just learn to use gromacs this days and I found a lot of figures in
research articles that illustrates the average C-alpha fluctuation
during MD of every AA residue, which can show very clearly that which
part of protein is stable and which is flexible. But I examined the
tutor and online manual for every commands yet cannot find the method.
Please give me a hand. Thanks a lot.

Shanjie Huang
-- 
  Shanjie Huang
  [EMAIL PROTECTED]

-- 
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[gmx-users] Why my protein always falls out of the water box?

2006-03-13 Thread Shanjie Huang
Hi dear friends,
I performed a molecular dynamics of a ligand-receptor complex for 5ns;
but I found that my complex always fall out from the water box quickly
in the first 1ns. What may be the problem? 
Can I constrain some residues which are far away from the active site to
aviod this problem? But I am worry about the extra constrain would
interfere my MD result, for in the normal situation there should be no
constrains. 

Thanks.

 
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[gmx-users] genbox fatal error with ligand-receptor complex: realloc for atoms_solvt->atomname : No such file or directory

2006-02-26 Thread Shanjie Huang
Hi,
I am working on a molecular dynamics of a receptor-ligand complex. I
created the .gro files for receptor and ligand separatedly and merged
them together, making sure the atom numbers are continuous. In the .top
file of receptor I have put " #include "ligand.itp" " and append a line
for ligand in [molecule section]. Then I executed "editconf"
successfully. When I execute:
genbox -cp receptor.gro -cs spc216.gro -o receptor_1.gro -p receptor.top

Error occured:
---
Reading solute configuration
CERM PROTESE
Containing 982 atoms in 100 residues
Initialising van der waals distances...
Opening library file /gdata/gromacs/share/top/vdwradii.dat
Opening library file /gdata/gromacs/share/top/aminoacids.dat
Reading solvent configuration
"216H2O,WATJP01,SPC216,SPC-MODEL,300K,BOX(M)=1.86206NM,WFVG,MAR. 1984"
solvent configuration contains 648 atoms in 216 residues

Initialising van der waals distances...
Will generate new solvent configuration of 516x487x422 boxes
Fatal error: realloc for atoms_solvt->atomname (-8686336 bytes, file
genbox.c, line 390, atoms_solvt->atomname=0x0x101bbs98): No such file or
directory

What should I do then? Please give me a hand. Thanks.

Sincerely
MC Yan
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