Hi Binh, Here's an example using the sym command to make helically arranged copies of a structure open 9eoe sym #1 H,4.75,1.4,20 center 0,0,0 axis z The syntax from the documentation is sym #model-num H,rise,angle,n[,offset] where rise is in angstroms, rotation angle is in degrees, and n is number of copies https://www.cgl.ucsf.edu/chimerax/docs/user/commands/sym.html Tom
On Jul 11, 2024, at 10:02 AM, Binh Nguyen via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
Awesome, thank you very much Elaine.
From: Elaine Meng <meng@cgl.ucsf.edu <mailto:meng@cgl.ucsf.edu>> Sent: Thursday, July 11, 2024 12:00 PM To: Binh Nguyen <AnBinh.Nguyen@UTSouthwestern.edu <mailto:AnBinh.Nguyen@UTSouthwestern.edu>> Cc: ChimeraX Users Help <chimerax-users@cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> Subject: Re: [chimerax-users] Generating long fibrils
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Following onto Oli's answer (thanks!), the ChimeraX "sym" command does allow building additional copies with helical symmetry:
<https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/command... >
The tricky part is figuring out what you need to put in the "sym" command for the axis and center, in addition to the helical parameters.
I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco
On Jul 11, 2024, at 9:10 AM, Oliver Clarke via ChimeraX-users <chimerax-users@cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote:
The server seems to be down right now, but it is possible you could also do this using the sym command in ChimeraX (I'm just not sure whether there are options for helical or only point group symmetry):
https://urldefense.com/v3/__https://www.cgl.ucsf.edu/chimerax/docs/user/comm...
Cheers Oli
On Jul 11, 2024, at 12:09 PM, Oliver Clarke <olibclarke@gmail.com <mailto:olibclarke@gmail.com>> wrote:
Hi Binh,
There may well be a way to do this with ChimeraX, but you can also easily use servalcat for this:
https://urldefense.com/v3/__https://servalcat.readthedocs.io/en/latest/spa_e...
Cheers Oli
On Jul 11, 2024, at 12:02 PM, Binh Nguyen via ChimeraX-users <chimerax-users@cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote:
Dear all,
Is there a way in chimeraX that I can use to generate a long fibril, say 20 chains, from a single chain with a twist angle of -1.4 degree and the rise (distance between layers) of 4.75 Angstrom. Some thing like this: <image.png>
I normally used Coot and manually add a single layer into density.
Thanks,
B
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