An overview of the structures of protein-DNA complexes

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

		N^o. of proteins (PDB files) in group
Protein group	N^o 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 ^†

^*Includes the two 'winged' helix-turn-helix families. †PDB entry 1a02 contains proteins belonging to the families 'zipper-type' and 'other'.

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