Hi Mark, The answer is "yes, but not automatically". First, you can use the selection inspector to change atom labels to anything you want (start the selection inspector either via the button in the lower right-hand corner of the Chimera window or with Tools->Inspectors->Selection Inspector). Note than for non-wireframe depictions you may need to add spaces to the start of the label to get it clear of the atom radius [this behavior will be much improved in the next release (in about a week)]. Not a great solution if you're doing this repeatedly of course. Another alternative is to make a relatively minor change to the Python source code. If you are using release 1.1951, then you can edit <where you installed chimera>/share/chimera/tkgui.py to make the change. Line 1314 of that file will look like this: rl = r.type you can change it to look like this: from resCode import res3to1 rl = res3to1(r.type) You need to preserve the original indentation, which is significant to Python. With this change, labels created from the Actions menu will use single-letter residue codes. It has the drawback that ligands and so forth will have 'X' as the residue label. I can provide a slightly more sophisticated code change to avoid 'X' labels if you'd like. Also, on a Mac, you are going to have to use Terminal to get into the Chimera app package, and the path will be <where you installed Chimera.app>/Contents/Resources/share/chimera/tkgui.py. So my question to you is whether this labeling is something you want to do on a day-to-day basis, or is it something you are doing just for an image or so infrequently that using the selection inspector is "good enough". Further, if we made single-letter labeling an option, would you want an exception made for ligands and/or non-standard residues? Eric Pettersen UCSF Computer Graphics Lab pett@cgl.ucsf.edu http://www.cgl.ucsf.edu On Sep 27, 2004, at 8:01 PM, Mark Daniels wrote:

Hello Chimera administrator(s)-

I was wondering if there is any way fior Chimera to display amino acid residue names in single-letter format, rather than the three-letter format one gets when selecting Actions-->Label-->residue-->name ? I have looked over all the documentation I can but have not found anything to answer this question.

Thanks in advance-

Mark

Mark J Daniels Department of Cell Biology The Scripps Research Institute La Jolla, CA 92037

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