Hi Uzma, Open the same file twice. You can control the activation state of each structure (whether it is movable or not) in several ways: <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/mouse.html#activedef> - checking/unchecking the "A" (Active) boxes in the Model Panel (under Favorites in the menu) - checking/unchecking the boxes below the Command Line (also under Favorites in the menu) - with the "select" command, e.g. ~select 0 select 0 to freeze/unfreeze model 0. Generally the first structure you open is model 0, the next is model 1, etc. There are also function buttons in the right side of the Model Panel that control model activation. See also this previous post about making dimers: <http://plato.cgl.ucsf.edu/pipermail/chimera-users/2011-April/006288.html> I hope this helps, 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 May 11, 2011, at 3:11 PM, uzma saqib wrote:
Hello, I want to totally freeze the movement of one protein (which is a homology model) and open another molecule of the same protein, which I want to keep movable, so that I can make a dimer out of this at my chosen place on the first protein molecule. Plz help . thanks uzma