[Chimera-users] Ramachandran plot for a selection

Elaine Meng meng at cgl.ucsf.edu
Wed May 27 10:47:08 PDT 2015

Dear Elena,
Welcome to Chimera!

Instead of “Ramachandran” plot, you could use the plotting functions in the MD Movie tool (Chimera’s trajectory viewer).  This would not show psi versus phi, you would have to plot each dihedral (psi and phi for each residue of interest) versus trajectory frame.  You can show them all on the same plot, however.

Documentation here:

Start the tool (Chimera menu: Tools… MD/Ensemble Analysis… MD Movie).  I don’t know what type of files you have from NAMD, but it can read PSF + DCD or prmtop + DCD files.

Then when MD Movie is showing your trajectory, from its dialog choose Analysis…Plot and then specify the dihedrals you want to plot.  See the link above for details.

Although Chimera has a Ramachandran Plot feature, it doesn’t sound appropriate for what you want to do.  It just shows the plot for the whole structure, and only a single structure at a time, not multiple frames of a trajectory.

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

On May 26, 2015, at 11:51 AM, Elena Lilkova <elilkova at phys.uni-sofia.bg> wrote:

> Dear Chimera community,
> First I would like to just say that I am new to Chimera. I made a MD
> simulation of a protein using NAMD. Now I am interested in generating a
> Ramachandran plot for the whole trajectory, but only for a specific
> selection of my protein, namely three specific residues. I fail to
> succeed. Could anyone probably suggest a solution?
> Elena Lilkova

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