On Jun 7, 2011, at 2:30 PM, Glenn Millhauser wrote:

Hi Folks, I am trying to add a four amino acid segment to the N-terminus of a protein in the pdb. I can generate the four residue stretch and move its C-term close to the N-term of the structured protein. I can then select the C' and N atoms, which are about 1.0 Angstrom apart. At that point, I am stuck. Not sure how to add a bond and then create a proper structure. I've played around with Join Models, but no luck. Without a peptide bond recognized by Chimera, ribbons are discontinuous. Any ideas? Many thanks, glenn There is now a section of the Join Models page specifically for joining two peptides, so this problem should be easy to solve in the future.

--Eric Eric Pettersen UCSF Computer Graphics Lab http://www.cgl.ucsf.edu