Fig. S1. Arsenite binding site in arsenite sensing regulators: ArsR from Escherichia coli (Shi et al., 1994; Shi et al., 1996); ArsR from Acidithiobacillus ferrooxidans (Qin et al., 2007); ArsR from Corynebacterium glutamicum (Ordonez et al., 2008); ArsD from E. coli (Li et al., 2001; Ye et al., 2010); AoxF from Thiomonas arsenitoxydans (Slyemi, 2010). The α helices are underlined with a dotted line; the β strands are double underlined. The cysteine residues coordinating arsenite are indicated in white letter in black boxes.

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