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Wild type, Site 1, and Site 2 mutant CadCs binding to and Cd(II)-induced dissociation from cad o/p DNA. Protein-DNA interactions were monitored by fluorescence anisotropy using a 34-bp double-stranded oligonucleotide labeled on one strand with 5′-fluorescein. Binding isotherms were generated by titration of unmetallated (•) or metallated (○, A), wild type (B), Site 1 mutant, and Site 2 mutant (C).
