Figure 2.

Structures of ArsR and CadC repressors. Homology models of three different ArsR repressors, EcArsR from E. coli plasmid R773, CgArsR from C. glutamicum and AfArsR from A. ferrooxidans, were constructed from the CadC crystal structure. The location and residues that comprise the Type 1 and Type 2 metal(loid) binding sites are indicated.