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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/commands/sym.html*symmetry__;Iw!!MznTZTSvDXGV0Co!H3NHtSe0HnpIAH7BgjMtwLlabtMS9TlWHiAEzBEhKL51L0B1C_jI4hZk4oSPIveRPsDGa-wazRtm8Aws9euEnujAHHJ8$ >
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> 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/commands/sym.html__;!!MznTZTSvDXGV0Co!H3NHtSe0HnpIAH7BgjMtwLlabtMS9TlWHiAEzBEhKL51L0B1C_jI4hZk4oSPIveRPsDGa-wazRtm8Aws9euEnpThIkFe$>
> Cheers
> Oli
>
>> On Jul 11, 2024, at 12:09 PM, Oliver Clarke <
olibclarke@gmail.com> wrote:
>>
>> Hi Binh,
>>
>> There may well be a way to do this with ChimeraX, but you can also easily use servalcat for this:
>>
>>
https://urldefense.com/v3/__https://servalcat.readthedocs.io/en/latest/spa_examples/ab42.html*generate-symmetry-copies__;Iw!!MznTZTSvDXGV0Co!H3NHtSe0HnpIAH7BgjMtwLlabtMS9TlWHiAEzBEhKL51L0B1C_jI4hZk4oSPIveRPsDGa-wazRtm8Aws9euEnnIQ1x6v$>>
>> Cheers
>> Oli
>>> On Jul 11, 2024, at 12:02 PM, Binh Nguyen via ChimeraX-users <
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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