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DtxR, Nur, and NikR families. (A) DtxRF structure. Two DtxR dimers are shown, bound to DtxR operator (1DDN, White et al., 1998). (B) FurF structure. The Ferric uptake regulator (Fur) is bound as a dimer to its operator (2W57, Sheikh and Taylor, 2009). (C) NikRF structure. NikR recognizes its operator sequence by a RHH DBD (2HZV, Schreiter et al., 2006). The location of Ni(II) atoms in DtxR and NikRA and Zn(II) atoms in Fur is shown by red spheres.
