[Chimera-users] Include position from multiple frames in one image

Elaine Meng meng at cgl.ucsf.edu
Mon Jul 16 11:52:17 PDT 2018

Hi David,
Not directly, but I know of at least one user who has used a per-frame script with the “define centroid” command to add a ball at the centroid of some residue at each trajectory frame.  The resulting figure shows a cloud of balls where that residue has been.

See for example Fig 5 in:
On Dioxygen and Substrate Access to Soluble Methane Monooxygenases: An all-Atom Molecular Dynamics Investigation in Water Solution.
Pietra F.
Chem Biodivers. 2017 Jan;14(1).

You could do that for any set of atoms that can be specified in the command, i.e. it doesn’t have to be a residue.

Per-frame scripts in MD Movie:
The “define” command:
Tutorial with example of per-frame script:

The other way would be to play back the trajectory holding the protein as steady as possible and output several separate images (most with only that small molecule) and then composite them in some image-editing app outside of Chimera.  You can save images with transparent background. 

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

> On Jul 16, 2018, at 11:27 AM, David Sáez <davidsaez at udec.cl> wrote:
> Hi, I have a molecular dynamics simulation created using Amber, and I visualize the result in Chimera using MD Movie.
> I would like to show the wandering of a small molecule inside the active site, but in just one picture. Is it possible to include all the positions sampled by some selected atoms in the exported image?
> Thanks for your help.

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