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Table 1 The groups of protein structures found in the dataset, the number of families within each group and the number of PDB files each family contains

From: An overview of the structures of protein-DNA complexes

   No. of proteins (PDB files) in group
Protein group No families in group Prokaryote Eukaryote Viral Total
1. Helix-turn-helix 16 * 32 28 - 60
2. Zinc-coordinating 4 0 23 - 23
3. Zipper-type 2 0 10 - 10
4. Other a-helix 7 1 5 2 8
5. ß-sheet 1 0 8 - 8
6. ß-hairpin/ribbon 6 10 1 - 11
7. Other 2 0 8 - 8
8. Enzyme 16 43 68 2 113
Total 54 86 151 4 241
  1. *Includes the two 'winged' helix-turn-helix families. †PDB entry 1a02 contains proteins belonging to the families 'zipper-type' and 'other'.