Hi All, How does one create a new CIF file using Elbow for a non-natural amino acid not found yet in the PDB? I know how to carry it out for the isolated residue readily (but of course thinks it is isolated and doesn't include the necessary peptide bonding) but how does one ensure the correct backbone restraints for it are included since it is not isolated but part of the chain? Joe ___________________________________________________________ Joseph P. Noel, Ph.D. Investigator, Howard Hughes Medical Institute Professor, The Jack H. Skirball Center for Chemical Biology and Proteomics The Salk Institute for Biological Studies 10010 North Torrey Pines Road La Jolla, CA 92037 USA Phone: (858) 453-4100 extension 1442 Cell: (858) 349-4700 Fax: (858) 597-0855 E-mail: [email protected] Web Site (Salk): http://www.salk.edu/faculty/faculty_details.php?id=37 Web Site (HHMI): http://hhmi.org/research/investigators/noel.html ___________________________________________________________