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Iron dependent regulatory proteins of the diphtheria toxin repressor family regulate transcription in a variety of bacterial species. These regulators have three domains. Domains 1 and 2 are required for DNA- and metal-binding while the role of the third domain is only partially defined. We compared full-length and carboxyl-terminally truncated variants of Corynebacterium diphtheriae DtxR and Mycobacterium...