Hi all, I am using Modeller to model a structure in which there is a portion - not present in the template - that I want to force to be an alpha-helix. If I introduce the secondray structure restraints in the entire corresponding region of sequence, I obtain a straightened helix. In the sequence, however, there is a Proline in correspondence of which I want to induce a little distortion of the helix. If I force the secondary structure only before and after the proline, by excluding it, I obtain some very strange angles of an helix with respect to the other, that is a too pronounced bending. Is there in Modeller a way to induce a "controlled" distortion (that in my case corresponds to control the angle between the CO and NH groups of the proline!)? thanks _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=...