[Chimera-users] How to determine the distance from SG of Cys to the centroid of a nearby Trp ring

[Elaine Meng]

Hi Ajay,
Unfortunately there isn't any way to draw a line between a centroid and an atom.  Instead you would need to add an atom at the centroid position, then measure atom-atom distance (which is shown as a line).

You can add an atom at specified coordinates using Build Structure (in menu under Tools… Structure Editing), Start Structure section.
<http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/editing/editing.html#start>

Centroid coordinates are reported in the Reply Log (under Favorites in menu) when the centroid is created, and can be written to a file using the Save button on the Axes/Planes/Centroids dialog.

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

On Sep 16, 2013, at 6:44 AM, "Pande, Ajay K" <apande at albany.edu> wrote:

> Thanks Elaine,
> 
> All that worked- thanks. Now, how do I show the line connecting the centroid to an atom (i.e.D1), which would also show its length in Angstroms?
> 
> Thanks
> 
> Ajay
>