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The RecQ proteins are a highly conserved group of DNA helicases which play crucial roles in the maintenance of genome stability. DrRecQ from the radioresistant bacterium Deinococcus radiodurans is a special member of the RecQ family because it contains three Helicase-and-RNase-D-C-terminal (HRDC) domains at the C-terminus. The helicase catalytic core is essential for ATPase and DNA-unwinding activities. In this work, the helicase catalytic core of DrRecQ was expressed in Escherichia coli, purified and crystallized. Crystals were obtained using the sitting-drop vapour diffusion method and X-ray diffraction data were collected to 2.9 Å resolution. The crystals belong to space group P212121, with unit-cell parameters a = 84.75, b = 95.61, c = 183.83 Å.

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