Hi Francesco, I'm glad to hear you like the centroid feature! If you want only a specific residue, use only the residue number. If you use both the name and the number you will get all of the residues with the name, PLUS all of the residues with the number. For example, if there are three histidines HIS 126,152, and 225, :his:225 will specify all three histidines. To specify only HIS 225, use :225 I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html On Jul 31, 2011, at 9:57 AM, Francesco Pietra wrote:
hello: "centroid" works fine to me in getting the trace of a moving molecule in and out of a protein, using command
define centroid radius 0.2 color red :residuename
when the residue is unique. In fact, the method has produced extraordinarily illustrative (I am using the words of the referee) in a paper that will appear shortly on Chemistry & Biodiversity. Now I have three diatomic molecules, only one of which is made moving around. In this case
define centroid radius 0.2 color red :residuename:residuenumber
for the moving residue does not work. What happens is that "red balls" for the specified residue are being accumulated at the place of origin of the residue, while the residue is leaving the protein as a short bar, not a ball. Could that be fixed in the above command?
thanks francesco pietra