3.2 Organized Collections of PDB Files

• CATH Classification - Architecture - Topology - Homology
  http://www.biochem.ucl.ac.uk/bsm/cath/

1HXN

• Enzymes
  http://www.biochem.ucl.ac.uk/bsm/enzymes/index.html
• SCOP Structural Classification of Proteins
  http: scop.mrc-lmb.cam.ac.uk/scop/
  686 folds in 7 classes
• all alpha (151)
• all beta (110)
• beta-alpha-beta (113)
• alpha + beta (208)
• multidomain (34)
• membrane (12)
• small proteins (58)
• FSSP Fold classification based on Structure-Structure alignment of Proteins
  http://www2.ebi.ac.uk/dali/ fssp/fssp.html
• MMDB Molecular Modelling DataBase
  http://www.ncbi.nlm.nih.gov/Structure/MMDB/mmdb.html
  
• SWISS-3DIMAGE Collection of annotated 3D images
  http://www.expasy.ch/sw3d/sw3d-top.html

4. Threading: From Sequence to 3D Fold