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Glucokinase catalyzes the phosphorylation of glucose using ATP to yield glucose 6-­phosphate. SgGlkA is a bacterial group III glucokinase from Streptomyces griseus that seems to play a regulatory role in carbon catabolite repression in this organism. SgGlkA was expressed in Escherichia coli, purified and crystallized using the sitting-drop vapour-diffusion method at 293 K. A crystal of SgGlkA in complex with glucose was obtained using a reservoir solution consisting of 0.9 M sodium/potassium tartrate, 0.2 M NaCl and 0.1 M imidazole pH 8.1 and diffracted X-rays to 1.84 Å resolution. The crystal of SgGlkA in complex with glucose belonged to space group P6222 or P6422, with unit-cell parameters a = b = 109.19, c = 141.18 Å. The crystal contained one molecule in the asymmetric unit.

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