The two structures below are both representative of the Cys2-His2 Zinc Finger motif. In both of the structures, note:
The secondary structure : a 2-stranded antiparallel b-sheet and one a-helix.
Also, note where the portions of the secondary structure interact with the DNA through hydrogen bonding with bases and phosphate groups
A hydrophobic core consisiting of 3 hydrophobic amino acids (which ones?)
In 1A1F: note the three fingers and how they curl around the DNA strand. Each finger contacts 3 successive 3-bp sites
1ZNF: Xenopus Protein, Xfin
1A1F: Cys2-His2 in 3-finger complex of Zif268 in mice