[Chimera-users] how to show backbone carbonyl oxygen

Elaine Meng meng at cgl.ucsf.edu
Sat Mar 3 12:53:22 PST 2012

Hi James,
The command ribbackbone merely enables the simultaneous display of both ribbon and backbone atoms.  You would still use display/~display to control which of those backbone atoms are shown, for example:

~disp @o
disp :110.a at o

As explained here, 
the default ribbon is smoothed and does not go exactly through the atom positions.  That is why by default they aren't shown at the same time.  However, if you want ribbon that goes through the exact CA atom positions, use the cardinal spline instead of the default B-spline, for example:

ribspline cardinal

Then the ribbon is not as pretty, however. There are some smoothing options for a compromise, as described in the help page elicited by command "help ribspline"
Elaine C. Meng, Ph.D.                       
UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco

On Mar 3, 2012, at 12:15 PM, james09 pruza wrote:

> Hi,
> I have couples of sticks in the ribbon, want to show the carbonyl oxygen of only one. What is happening is with the command ribbackbone #0:110.A at O all the main-chain atoms of sticks comes up.
> If there is only residues110 shown in stick, its fine. Also, the sticks are not following the ribbon tracing. I appreciate your help.
> James

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