The FSSP database is based on exhaustive all-against-all 3D structure comparison of protein structures currently in the Protein Data Bank (PDB) http://www.pdb.bnl.gov/
The classification and alignments are automatically maintained and continuously updated using the Dali search engine http://www2.ebi.ac.uk/dali/
Multiple alignment views
FSSP database of structurally aligned protein fold families http://www.sander.embl-heidelberg.de/fssp/paper.html