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The bacterium Streptomyces coelicolor produces useful antibiotics from its secondary metabolites. DraK is a sensory histidine kinase involved in the differential regulation of antibiotics in S. coelicolor through the DraR/DraK two-component system. Here, the extracellular sensory domain of DraK was overexpressed in Escherichia coli, purified and crystallized using the sitting-drop vapour-diffusion method. The crystal diffracted to 2.2 Å resolution and belonged to space group C2221, with unit-cell parameters a = 41.91, b = 174.50, c = 145.25 Å, α = β = γ = 90°.

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