Fold: OB-fold

barrel, closed or partly opened n=5, S=10 or S=8; greek-key

Lineage:

1. Root: scop
2. Class: All beta proteins
3. Fold: OB-fold
   barrel, closed or partly opened n=5, S=10 or S=8; greek-key

Superfamilies:

1. Staphylococcal nuclease (1)
2. Bacterial enterotoxins (2)
3. Tissue inhibitor of metalloproteinases, TIMP (1)
4. Nucleic acid-binding proteins (8)
5. Inorganic pyrophosphatase (1)
6. MOP-like (3)
7. Histidine kinase CheA, C-terminal domain (1)