RE: [gmx-users] Intrinsically disordered proteins

2010-10-18 Thread #ZHAO LINA#
Hi, 

1. Thanks for the webpage you provided, I noticed there is a avogadro there, 
and  right now coincidently I have a question relevant to the avogadro,

When I tried the avogadro-packmol-extensions, I had installed the avogadro and 
packmol well, 
but I do not know

where the avogadro plugins/modules can be put ?
I tried the put the packmolextension.so under usr/lib/avogadro/1_0/extensions/ 
but seems not work,

Might someone has tried and knew the answer, actually  I had asked on the other 
place, but none feedback.

2.  Wow, it's going to be lots of works. 

lina 

From: gmx-users-boun...@gromacs.org [gmx-users-boun...@gromacs.org] on behalf 
of Justin A. Lemkul [jalem...@vt.edu]
Sent: Monday, October 18, 2010 9:37 PM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] Intrinsically disordered proteins

#ZHAO LINA# wrote:
> Hi,
>
> 1. For those intrinsically disordered proteins, the sequence is known,
> how the simulations will be set up, I mean, the first PDB will be
> needed, how to get this one? (Ideally, not necessarily to be practical)
>

http://www.gromacs.org/Documentation/File_Formats/Coordinate_File#Sources

> 2. suppose I got a PDB, there were several models there, let's say 16,
> is it acceptable to just take one, say model 1?
>

Making an arbitrary choice is not a good idea.  You have to justify that the
model you selected is in some way representative of the ensemble.  You could do
that by demonstrating that your simulation overlapped the configuration space of
the ensemble in the PDB file, i.e. sampled all the expected configurations, thus
the starting structure was not an inappropriate bias.

-Justin

> Thanks for any answering,
>
> lina
>

--


Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin


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Re: [gmx-users] Intrinsically disordered proteins

2010-10-18 Thread Justin A. Lemkul



#ZHAO LINA# wrote:

Hi,

1. For those intrinsically disordered proteins, the sequence is known, 
how the simulations will be set up, I mean, the first PDB will be 
needed, how to get this one? (Ideally, not necessarily to be practical)




http://www.gromacs.org/Documentation/File_Formats/Coordinate_File#Sources

2. suppose I got a PDB, there were several models there, let's say 16, 
is it acceptable to just take one, say model 1?




Making an arbitrary choice is not a good idea.  You have to justify that the 
model you selected is in some way representative of the ensemble.  You could do 
that by demonstrating that your simulation overlapped the configuration space of 
the ensemble in the PDB file, i.e. sampled all the expected configurations, thus 
the starting structure was not an inappropriate bias.


-Justin


Thanks for any answering,

lina



--


Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin


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Re: [gmx-users] Intrinsically disordered proteins

2010-10-18 Thread ms

On 18/10/10 14:26, #ZHAO LINA# wrote:

Hi,

1. For those intrinsically disordered proteins, the sequence is known, how the 
simulations will be set up, I mean, the first PDB will be needed, how to get 
this one? (Ideally, not necessarily to be practical)

2. suppose I got a PDB, there were several models there, let's say 16, is it 
acceptable to just take one, say model 1?

Thanks for any answering,


That's a theoretical question which has no real "true" answer, given 
that there is no "true" structure for an IDP, but only an ensemble of 
structures.


I've seen different approaches, from using ROSETTA predictions to simply 
using random coil structures, to carefully picking ensembles from 
previous experimentally-restrained simulations. Pick up your favourite 
approach in the literature, also taking into account what you want to do.


m.

--
Massimo Sandal, Ph.D.
http://devicerandom.org
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[gmx-users] Intrinsically disordered proteins

2010-10-18 Thread #ZHAO LINA#
Hi,

1. For those intrinsically disordered proteins, the sequence is known, how the 
simulations will be set up, I mean, the first PDB will be needed, how to get 
this one? (Ideally, not necessarily to be practical)

2. suppose I got a PDB, there were several models there, let's say 16, is it 
acceptable to just take one, say model 1?

Thanks for any answering,

lina

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