I am exploring ModBase to build a model for the REcQ2 of arabidopsis
Thaliana(swiss prot acc: Q9FT73).
ModBase found 2 structures matching this target and after downloading
the coordinates file and also the showfile.chimerax file, I was able
to visualize with chimera both structures with apparently a
satisfactory relative orientation. Below I copy-paste the target
coverage:
2v1xA (63-592) crystal structure of human recq-like dna helicase
1wudA (531-602) e. coli recq hrdc domain
I wanted to know if there is an optimization step in the ModBase
pipeline to achieve this and if it is referenced somewhere....and if
not, which modules-scripts are available?
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Today's Topics:
1. Re: restraining secondary structure (Modeller Caretaker)
2. Re: BLK usage => mainy chains (Modeller Caretaker)
3. Re: Loop Modeling (Modeller Caretaker)
4. Loop modeling while restraining the secondary structure
(bharat lal)
----------------------------------------------------------------------
Message: 1
Date: Mon, 24 Jan 2011 14:49:01 -0800
From: Modeller Caretaker <modeller-care@salilab.org>
Subject: Re: [modeller_usage] restraining secondary structure
To: bharat lal <monu46010@yahoo.com>
Cc: modeller <modeller_usage@salilab.org>
Message-ID: <4D3E01DD.9030008@salilab.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 1/24/11 1:00 AM, bharat lal wrote:
I am using the following script for restraining the beta strands in my
protein (after searching the mailing archives):-
I try to build a modele with 2 protein templates. I want to modelise
just one loop of 1pkg, part of it on the template 3A2M, the rest of the
loop de novo. The rest of 1pkg must not be changed, so I put it as BLK:
I want to graft the loop from some other protein taken from pdb to my
protein structure.
You could use multiple-template modeling to achieve this. Alternatively,
you could manually combine the two PDB files, using a PDB viewer or even
by editing the files in a text editor.
I tried modeling it on my own but some parts of the
secondary structure (beta sheet) also change into loop while loop
modeling ..
That is hardly surprising - loop modeling does not use any information
from the template.
So I want to fix those two ends of the beta sheet where the
loop is present so that these end should not change to loop region.
Thanks for the help regrading model-loop-define.py script. I have
one doubt in model selection .. The number of residues that has to
be mentioned for restraining should according to the target sequence
only know ?? ..
Also, I generated some 5 models while restraining some portion of
the sequence as beta strands ?and after seeing all the structures I
found that its model 3 that is having perfectly restrained beta
sheets as compared to others but its DOPE score is ?more as compared
to other structures . In this type of situation how do we have to
select the correct model ?? Here's the list of energies that I got :
Also, I would like to ask one more thing about restraining structure
that while giving the residue range generally last 2 or some times
1 residue/s doesnot retain the restrained structure .. In that case
what do i need to do ??
After doing the restrained modeling is it required to do loop
refinement .. as I am doing loop refinement also by generating some
50 structures and then finally selecting the one with low DOPE score
.. Is this strategy right or wrong ???
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Bharat
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