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  Distances: 
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The yeast GAL4 Protein is a transcriptional activator that binds to DNA. The DNA is shown using Sticks with the bases colored Shapely, and the backbone colored red. The two subunits of the symmetric dimer are shown using the Backbone display. The DNA recognition module is blue; the linker region is purple; and the dimerization element is green. The two metal ions bound to each subunit are shown as yellow balls. (cf. Fig. 3 of Marmorstein, et al.)
Close-up view of protein-DNA interactions in one half-site.
    Protein residues H-bond to the DNA bases as follows: Lys17 (carbonyl) to C8; Lys18 (carbonyl) to C7 and C8; and Lys18 (amino) to G6 and/or G7.
    The protein also makes these contacts to the DNA sugar-phosphate backbone: Gln9 and Arg15 with phosphate 5; and Lys20, Cys21 (NH), and Lys23 with phosphate 6. (cf. Figs. 5 & 6 of Marmorstein, et al.)
    Show H-bond distances to:DNA bases; DNA backbone.
    (Zoom-in to see the individual contacts.)

Viewing tips:
Use the buttons to the right of the image to show only portions of the structure; then use the Chime menu to display or color the molecule. The rotate buttons act on the entire structure. Remove the distance monitors with a second click.