I cannot for the life of me get join models to work.

  1. I have two structures.
  2. The structures overlap.
  3. I align them using matchmaker.
  4. I delete the overlapped residue from one chain.
  5. I select the appropriate C and N terminal residues
  6. I try to use join models under Build structure
  7. The apply box remains gray, no matter what residue or atom I select.
What are common problems that cause join models to not work?

Stewart
Morley

Brigham Young University