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Fluorescence anisotropy titrations of CueR (A) and PbrR691 (B) binding to Cy3-labeled double-strand DNA. Solid lines are the fits with Eq. 1, with dissociation constants of KD(apo-CueR) = 6 ± 2 nM, KD(holo-CueR) = 1.9 ± 0.8 nM, KD(apo-PbrR691) = 43 ± 9 nM, and KD(holo-PbrR691) = 23 ± 9 nM. The x axes are total protein concentrations. Plots with x axes being the free protein concentration are given in Fig. S5.
