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NADH:rubredoxin oxidoreductase (NROR), an O2-inducible protein, is a versatile electron donor for scavengers of O2 and reactive oxygen species (ROS) in Clostridium acetobutylicum. Recombinant NROR was overexpressed in Escherichia coli and purified to homogeneity; it was subsequently crystallized using the sitting-drop vapour-diffusion method at 293 K. Preliminary crystallo­graphic analysis revealed that the crystals belonged to space group P4122 or P4322, with unit-cell parameters a = b = 98.6, c = 88.3 Å, and diffracted to 2.1 Å resolution. Assuming that the crystals contained one molecule per asymmetric unit, the Matthews coefficient was calculated to be 2.7 Å3 Da-1 and the solvent content to be 54.1%.

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