how do I calculate the rotation angle of a certain helix  in structures with different ATP analogues?
and how if it is a domain ?
Best wishes
Xinghua Qin

Xinghua Qin
State Key Laboratory of Plant Physiology and biochemistry 
College of Biological Sciences
China Agricultural University
No.2, Yuan Ming Yuan West Road
Haidian District, Beijing, China 100193
Tel: +86-10-62732672