Hi David, See the "move" command. It has been improved since the production release 1.3, so I recommend using a daily build (1.4). Here is the documentation for its current incarnation. <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/move.html> Since you can only bond things in the same model, it sounds like you would first do all the positioning with "move" and then use "combine" (or "copy/combine" in the Model Panel) to merge them into a single model, and then add bonds. Note that when you combine models it will make you either change chain IDs or renumber residues to avoid conflicts where multiple residues shave the same number/chain identifier. <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/combine.html> <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/modelpanel.html> Hmm, a nanotube may be even trickier. If it is already just one big residue, I'm not sure what will happen... it *might* work... I guess it depends what you are going to do with the structure. You could make "pseudobonds" (see PseudoBond Reader tool) between the different models instead of bothering to combine them into a single model. Another possibility is to write the multiple models out in their new coordinates as multiple models and then do your own text- editing to make them a single model, and read them back in. You would still want to avoid conflicts where multiple residues or multiple atoms have the same identifiers, however. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html On Jul 8, 2009, at 9:09 AM, David Chenoweth wrote:

Hi, Can anyone tell me the easiest way to translate an entire model by a defined amount (angstroms) in a defined direction. I have a slice of a nanotube and I would like to open it several times, translate each section, and make bonds between the translated sections in order to create a longer nanotube and then save the new coordinates as a new model. Thanks, Dave