The Escherichia coli ytfG gene product, with NAD(P)H:quinone oxidoreductase activity, was crystallized by the hanging-drop vapour-diffusion method at 296 K. A 1.78 A data set has been collected using synchrotron radiation at Pohang Light Source, South Korea. The crystal belongs to the primitive trigonal system, with unit-cell parameters a = b = 81.7, c = 76.8 A. Analysis of the packing density shows that the asymmetric unit probably contains one monomer, with a solvent content of 48.8%.
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