Crystallization and preliminary X-ray diffraction analysis of the metalloregulatory protein DtxR from Thermoplasma acidophilum.

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Address: Department of Life Science, Dongguk University, Seoul, Republic of Korea.
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abstract

the diphtheria toxin repressor (DtxR) is a metal-ion-dependent transcriptional regulator which regulates genes encoding proteins involved in metal-ion uptake to maintain metal-ion homeostasis. DtxR from Thermoplasma acidophilum was cloned and overexpressed in Escherichia coli. Crystals of N-terminally His-tagged DtxR were obtained by hanging-drop vapour diffusion and diffracted to 1.8 Å resolution. DtxR was crystallized at 296 K using polyethylene glycol 4000 as a precipitant. The crystals belonged to the orthorhombic space group P2(1)2(1)2, with unit-cell parameters a = 61.14, b = 84.61, c = 46.91 Å, α = β = γ = 90°. The asymmetric unit contained approximately one monomer of DtxR, giving a crystal volume per mass (V(M)) of 2.22 Å(3) Da(-1) and a solvent content of 44.6%.

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