one option would be to make intermediates based on linear
interpolation and then make a movie of the "morph."  Gerstein's group
has done some work at this.
http://www2.molmovdb.org/wiki/info/index.php/Morph_Server

If you just want to visualize them together my suggestion would be to:
show one of the structures without the helix
make an object for the helix in each structure and another object with
both helices
show cartoons of each helix
show a transparent surface of the object with both helices
color each helix differently so that the cartoons and surfaces
represent conformational changes.
play with clipping planes applied to the transparent surface.

you could do this type of image for the morph too to emphasize the helix.

On Fri, Nov 20, 2009 at 12:45 PM, Huang, Xin <h...@amgen.com> wrote:
> I want to make movie showing conformational changes of one helix (including a 
> couple of side chains) between two structures of the same protein.  Could 
> anybody teach me how to make morph using pymol version 1.2r2?
>
> Many Thanks.
>
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