It will help you in the field of peptide based therapeutics and drug designing
For example, If you want to find antimicrobial peptides which are non-toxic to normal cells
There are 8634 such peptides which are antimicrobial but not toxic
SATPdb: A database of structurally annotated therapeutic peptides.
You may try PEPstrMOD: structure prediction of peptides containing natural, non-natural and modified residues. (http://osddlinux.osdd.net/raghava/pepstrmod/) article link (http://www.biologydirect.com/content/10/1/73). Using PEPstrMOD you can also design peptide having desired secondary structure or specific dihedral angles to specific residues.
Jesus Seco Moral
University of Barcelona
University of Macau
Walchand College of Arts and Science, Solapur
Dhirubhai Ambani Institute of Information and Communication Technology
Mendel University in Brno
Institute of Microbial Technology