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There is no easy way to do this. Both active-residue and closest-atom return the CA of a residue if a CA exists in the residue. Most of the time that is a reasonable thing to do. Not here though :-( Paul. On 10/12/12 19:05, Sam Stampfer wrote: > Thanks for your help! That is close, but it will only fix the alpha > carbon of the selected residues. > > On Mon, Dec 10, 2012 at 1:11 PM, Debreczeni, Judit > <[log in to unmask] > <mailto:[log in to unmask]>> wrote: > > off the top of my head (i.e. not tested): > > (add-key-binding "fix atom" "F" > > (lambda () (mark-atom-as-fixed (car (active-residue)) (cdr > (active-residue)) 1))) > > (add-key-binding "clear fixed atoms" "D" > > (lambda () (clear-fixed-atoms-all))) > > > *From:*CCP4 bulletin board [mailto:[log in to unmask] > <mailto:[log in to unmask]>] *On Behalf Of *Sam Stampfer > *Sent:* 10 December 2012 16:22 > *To:* [log in to unmask] <mailto:[log in to unmask]> > *Subject:* [ccp4bb] Coot keybinding for fixing an atom in place > > Dear CCP4 Bulletin Board, > > Does anyone have a keybinding I can add to my .coot file so that I > can hit a key (for example, Shift-F) to fix in place the actively > selected atom, without having to go through the fixed atoms dialog > box? Also, does anyone have a keybinding for "Clear Fixed Atoms"? > > Thanks! > > -Sam > >