The Evolutionary Classification Of protein Domains (ECOD) browser classifies protein structures according to evolutionary relationships: (A) architecture, (X) possible homology, (H) homology, (T) topology, (F): Family. ECOD is updated regularly after new PDB releases are classified.
Here you can browse through PDB structures by their ECOD classification.
References
- H. Cheng, R. D. Schaeffer, Y. Liao, L. N. Kinch, J. Pei, S. Shi, B. H. Kim, N. V. Grishin. (2014) ECOD: An evolutionary classification of protein domains. PLoS Comput Biol 10(12): e1003926.
- H. Cheng, Y. Liao, R. D. Schaeffer, N. V. Grishin. (2015) Manual classification strategies in the ECOD database. Proteins 83(7): 1238-1251.