FIG. 4.

Summary of specific amino acid-base pair contacts by RhaS and comparison with MarA DNA contacts. DNA half-sites are divided into two major grooves and an intervening minor groove. Vertical and angled black lines represent amino acid-base pair contacts. The broken bar indicates a less conclusive DNA contact by RhaS. The side of the DNA sequence on which each amino acid is represented is arbitrary and is not meant to represent the base within the pair that is contacted. For MarA, the base(s) within each pair that is contacted is known (30); however, this information is not represented for simplicity and because the corresponding information is not known for RhaS. Relative positions of H-T-H 1 and 2 are shown below the two DNA sequences.