[Chimera-users] Symmetry operation calculations for multimeric fibrillar assemblies

Einav Tayeb-Fligelman einavt at gmail.com
Tue Jun 12 13:47:22 PDT 2018

Dear Chimera support team,

I am trying to deposit to the PDB an X-ray crystal structure I solved, and
came across with the need to calculate its biological assembly, which is
pretty tricky in my case, and so I wondered if Chimera could help me with
I am working on fibrils made out of repeating units of peptides. The
asymmetric unit in my structures usually contains only a monomer, whereas
the structure of the fibril is obtained by drawing the copies of this
monomer along the fibril axis (potentially there are tens of thousands of
those copies), based on the unit cell parameters (the copies are packed
within the unit cell). After choosing and drawing an arbitrary number of
copies along the axis of fibrillation I would like to get the output of the
symmetry operations resulting in this desired representation of the fibril,
in order to deposit them as the biological assembly of my structure.
I would appreciate if you could advice me to how to obtain those symmetry
operations so to define my biomt.

Thank you in advance,

Einav Tayeb-Fligelman, PhD
The Landau lab
Faculty of Biology
Technion, Israel Institute of Technology
Haifa, Israel
E-mail :einavtf at campus.technion.ac.il
Tel at the lab:+972-77-8871964 <+972%2077-887-1964>
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