[Chimera-users] Helical Parameter estimate using Chimera

Elaine Meng meng at cgl.ucsf.edu
Mon Apr 15 09:45:26 PDT 2019

Hi Reja,
There is a “measure symmetry” command but it is somewhat limited.  

"Check each specified volume data set (map) for cyclic, dihedral, tetrahedral, octahedral, and icosahedral symmetries in standard coordinate systems. Helical symmetry can be considered if approximate parameters are supplied.”

For command syntax and further details:

I hope this helps,
Elaine C. Meng, Ph.D.
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Apr 14, 2019, at 5:16 PM, Rejaul Hoq Nayem <nayem1chem at gmail.com> wrote:
> Hi All, 
> I want to estimate Helical parameter ( Helical Rise, Twist, asymmetric sub unit, per turn  ) of Tau filament for Reference Module generation using Chimera. Is it possible to estimate from raw micrographs or 2D Class Average  by Chimera? 
> I was wondering if any of you can provide me procedure if any, will be a great help. Eagerly waiting for your reply.
> Thanks in Advance, 
> Reja  

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