Hi Xiang-Jun Lu,

Thanks for proving me wrong. Congratulations on your duplicated model!
Please share the commands that you used with DSSR to generate the duplicated 
helix.

PyMOL does not generate the cartoon representation for the backbones of your 
duplicate helix. 
Do you know why?

Best regards,

Blaine

Blaine Mooers, Ph.D.
Associate Professor
Department of Biochemistry and Molecular Biology, College of Medicine
Director of the Laboratory of Biomolecular Structure and Function
Academic Director, Biomolecular Structure Core, COBRE in Structural Biology
Full Member, Cancer Biology Program, Stephenson Cancer Center
University of Oklahoma Health Sciences Center

Mailing Address:
975 NE 10th Street, BRC 466
Oklahoma City, OK 73104-5419
Office: 405-271-8300 Lab: 405-271-8312

Websites:
Faculty page: 
https://basicsciences.ouhsc.edu/bmb/Faculty/bio_details/mooers-blaine-hm-phd
BSC-OKC (LBSF): 
https://research.ouhsc.edu/Core-Facilities/Laboratory-of-Biomolecular-Structure-and-Function
COBRE in Structural Biology: https://www.ou.edu/structuralbiology
________________________________________
From: Xiang-Jun Lu [3dna...@gmail.com]
Sent: Friday, November 12, 2021 8:05 AM
To: pymol-users@lists.sourceforge.net
Subject: Re: [PyMOL] [EXTERNAL] create a 26 bp RNA from a 13 bp system

Message: 1
Date: Thu, 11 Nov 2021 01:21:47 +0000
From: "Mooers, Blaine H.M.  (HSC)" 
<blaine-moo...@ouhsc.edu<mailto:blaine-moo...@ouhsc.edu>>
To: amirhossein taghavi 
<taghavi.amirhoss...@gmail.com<mailto:taghavi.amirhoss...@gmail.com>>,
        
"pymol-users@lists.sourceforge.net<mailto:pymol-users@lists.sourceforge.net>"
        
<pymol-users@lists.sourceforge.net<mailto:pymol-users@lists.sourceforge.net>>
Subject: Re: [PyMOL] [EXTERNAL]  create a 26 bp RNA from a 13 bp
        system
Message-ID:
        
<87dcc6c40b22804192b6892e6429ec5f019d5e3...@countach.hsc.net.ou.edu<mailto:87dcc6c40b22804192b6892e6429ec5f019d5e3...@countach.hsc.net.ou.edu>>
Content-Type: text/plain; charset="us-ascii"

Hi Amir,

No, not automatically. Your RNA is very distorted from
the standard A-form. I doubt any modeling program
can accurately extend such a distorted helix. Maybe
someone else will prove me wrong.


DSSR was used to create the attached 26-base-pair (bp) long RNA by duplicating 
the initial 13-bp model. I'm not sure whether this is the outcome Amir was 
hoping for.

Best regards,

Xiang-Jun

--
Xiang-Jun Lu (Ph.D.)
Email: xiang...@x3dna.org<mailto:xiang...@x3dna.org>
Web: 
http://x3dna.org/<https://urldefense.proofpoint.com/v2/url?u=http-3A__x3dna.org_&d=DwMFaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=rxarJ7aLyHGI62pje1gd6hPxYn9Xv-2lWNWh_1Owonw&m=SezBp4UL1C-pr1f35s70RAkgFpWQaaVnI3ISWKOA7wkFTZWpjoYN2QWKHvmvgwa4&s=SCbMW3JwZkTKAxEfPB8w5TtSItCw4MMTIOr8sxCVEIE&e=>
Forum: 
http://forum.x3dna.org/<https://urldefense.proofpoint.com/v2/url?u=http-3A__forum.x3dna.org_&d=DwMFaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=rxarJ7aLyHGI62pje1gd6hPxYn9Xv-2lWNWh_1Owonw&m=SezBp4UL1C-pr1f35s70RAkgFpWQaaVnI3ISWKOA7wkFTZWpjoYN2QWKHvmvgwa4&s=R5l09hlMu8Qv8Uw7eKpaBtB-k1s-E1xX0jqFJ9b_oDg&e=>

 Your RNA does not have the expected
doughnut cross-section of the A-form when
viewed down the helical axis.

Your model has triclinic unit cell dimensions on the first line of the 
coordinate file.
Is it from a crystal structure? If it is, it might be stacked
end-on-end in the crystal lattice. You could generate its
symmetry mate and save its coordinates.
However, the cryst card in your file is corrupted, and
PyMOL cannot use it to generate symmetry mates.

You can align the terminal base pairs manually through a
series of commands. If you try by dragging one copy
relative to another, you will wind up pulling out all of your
hair. The commands and patience will keep you out  of the mad house.

load model_.pdb
orient
# align along the x-axis
copy model2, model_
translate [38,0,0], model2
rotate x, -45, model2

Issue a series of subsequent translate, rotate, and orient commands as needed.
Use smaller increments like 1 or 2 angstroms and 5 or 10 degrees.
The angle between the terminal base pairs should be about 33 degrees.
With patience, you can do this in less than an hour.

However, I am not sure how relevant the duplicated structure will be given
the distortions in model_.pdb.

Best regards,

Blaine

Blaine Mooers, Ph.D.
Associate Professor
Department of Biochemistry and Molecular Biology, College of Medicine
Director of the Laboratory of Biomolecular Structure and Function
Academic Director, Biomolecular Structure Core, COBRE in Structural Biology
Full Member, Cancer Biology Program, Stephenson Cancer Center
University of Oklahoma Health Sciences Center

Mailing Address:
975 NE 10th Street, BRC 466
Oklahoma City, OK 73104-5419
Office: 405-271-8300 Lab: 405-271-8312

Websites:
Faculty page: 
https://basicsciences.ouhsc.edu/bmb/Faculty/bio_details/mooers-blaine-hm-phd
BSC-OKC<https://basicsciences.ouhsc.edu/bmb/Faculty/bio_details/mooers-blaine-hm-phdBSC-OKC>
 (LBSF): 
https://research.ouhsc.edu/Core-Facilities/Laboratory-of-Biomolecular-Structure-and-Function
COBRE in Structural Biology: https://www.ou.edu/structuralbiology
________________________________________
From: amirhossein taghavi 
[taghavi.amirhoss...@gmail.com<mailto:taghavi.amirhoss...@gmail.com>]
Sent: Wednesday, November 10, 2021 5:03 PM
To: pymol-users@lists.sourceforge.net<mailto:pymol-users@lists.sourceforge.net>
Subject: [EXTERNAL] [PyMOL] create a 26 bp RNA from a 13 bp system

Hello,

I have an RNA duplex with 13 base-pairs (attached). Is it possible to duplicate 
this system and then fuse the two molecules to create a 26 base-pair long 
system using the pymol.

Thanks in advance.

Cheers,
Amir



------------------------------

Message: 2
Date: Wed, 10 Nov 2021 21:44:21 -0500
From: amirhossein taghavi 
<taghavi.amirhoss...@gmail.com<mailto:taghavi.amirhoss...@gmail.com>>
To: "Mooers, Blaine H.M. (HSC)" 
<blaine-moo...@ouhsc.edu<mailto:blaine-moo...@ouhsc.edu>>
Cc: 
"pymol-users@lists.sourceforge.net<mailto:pymol-users@lists.sourceforge.net>"
        
<pymol-users@lists.sourceforge.net<mailto:pymol-users@lists.sourceforge.net>>
Subject: Re: [PyMOL] [EXTERNAL]  create a 26 bp RNA from a 13 bp
        system
Message-ID:
        
<CAP4-oUjYJ-PbCdeoBsOJ3=cnEje_7vwhTWGVitxd=gk6d9b...@mail.gmail.com<mailto:gk6d9b...@mail.gmail.com>>
Content-Type: text/plain; charset="utf-8"

Hello Prof. Blaine,

Thanks a lot for the detailed explanation. The model is out of MD
simulations with the box information.
I will try the workflow you suggested.
I very much appreciate your help.

Best regards,
Amir




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