Protein Repeat Identification by Graph Spectral Analysis

PRIGSA2 is a graph based algorithm which implements knowledge-based and de novo approach for the identification of structural repeats in proteins. The tool takes PDB file as input and gives the periodicity and coordinates as output.

Note: Cα network is suitable for identification of repeats in single chain, while atom pair contact is suitable for identification of multimeric repeats.


Network Type:
No of chains:
Chain 2:
Chain 3:
Chain 4:

Related publication: Chakrabarty B, Parekh N: PRIGSA2: Improved version of protein repeat identification by graph spectral analysis. J Biosci 2020, 45(1)



Contact: Broto Chakrabarty and Dr. Nita Parekh,
Centre for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology-Hyderabad