Fig. 6.

Structures of the arm and dimerization domain. (A)Tube representation of residues 7–23 of the arabinose-bound (green) and the arabinose-free state (red) structures of the dimerization domain of AraC. Residues 24–30 and 32–166 of the arabinose-bound dimerization domain, subunit A from PDB file 2ARC, were RMS overlaid with the same regions of the apo structure of the dimerization domain, subunit D, from PDB 1XJA and are shown in blue-gray. (B) Structure comparison of the N-terminal arm. Differences in the phi (open circles) and psi (filled squares) values for residues 7–25 between the arm structures in the plus arabinose (2ARC) and apo structure of the Y31V mutant (1XJA) for each position in the arm.