Dear all, I want to compare the conformational change of two similar structures, using one alpha helix as the reference. Then, how can I get a vector that can represent both the position and direction of the helix? Is there any well-known software can do this？ Or, should I build a cylinder model, with parameters [radius,bottom center(x1,y1,z1),top center(x1,y2,z2)], using the coordinates of C,C(alpha) and N to fit these parameters? Thanks for any suggestions
Regards, Yuan SHANG
