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Despite a common evolutionary origin, individual members of the ArsR/SmtB family of bacterial metal-responsive transcriptional repressors sense a wide range of heavy-metal ions. The molecular basis for this metal ion selectivity is unclear. Here, we establish that Staphylococcus aureus plasmid pI258 CadC, a Cd(II)/Pb(II)/Bi(III)/Zn(II) sensor, contains two distinct metal-binding sites: a thiolate-rich...
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