Hi Sumitro, As soon as you open a protein structure, the angle values are available as the residue attributes named "phi" and "psi". Chimera doesn't make a Ramachandran plot, but you can write out the values to a file or show them as labels (or as colors etc. just like any other numerical attributes). To save the values to a file or show them with colors etc., you would use Render by Attribute (under Tools... Structure Analysis) as documented here: <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/render/render.html#...
How to save to a file is described at the very bottom of that page. To show the values as labels you could use "Actions... Label... residue... custom" and substitute phi or psi for name or number, but the values are not rounded and not easy to view all at once. It is reasonable if you only select and label a few residues at a time, however. 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 Mar 23, 2010, at 4:00 AM, Sumitro Harjanto wrote:
Hi , Is it possible to use chimera to report the psi-phi angle of pdb protein models..? Cheers, Sumitro