Welcome to Natural Peptides Module for Structure Modification

This module allows users to modify a peptide tertiary structure in PDB file format or PDB file. The peptide structure can be modeled/designed with user defined secondary structure or dihedral angle restraints. User needs to provide the peptide structure in PDB format either in text area or upload the PDB file of his/her peptide. Existing structure in the PDB can also be modified if the PDB code is provided. For more information click help

Peptide Structure Submission Form

Peptide structure in PDB format                                                       

Upload a peptide structure in PDB format     Example Structure file
Enter PDB ID with Chain ID                    

If you are using PEPstrMOD, please cite the following articles:
i) Singh, S., Singh, H., Tuknait, A., Chaudhary, K., Singh, B., Kumaran, S. and Raghava, G.P.S. (2015) PEPstrMOD: structure prediction of peptides containing natural, non-natural and modified residues. Biology Direct 10:73.
ii) Kaur, H., Garg, A. and Raghava, G.P.S. (2007) PEPstr: A de novo method for tertiary structure prediction of small bioactive peptides. Protein Pept Lett. 14:626-30.
Click Here for PEPstrMOD Manual