How to model missing loop by Chimera


  • Chimera (

  • Licence number of Modeller (


  1. Open a PDB file by chimera.

  2. Go to Tools -> Model/Refine loops

  3. Select a chain that has a missing loop of interest

  4. Press OK, and then two windows appear for the sequence and modelling setting.

  5. Select a missing residues, which may be surrounded by a red rectangle if the PDB contains the information of where the missing residues are.

  6. Press Apply in the windown Model Loops/Refine Structure.