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Expression, purification and preliminary crystallographic analysis of sucrose phosphate synthase (SPS) from Halothermothrix orenii.

This is the first report of the crystallization of a sucrose phosphate synthase (SPS; EC 2.4.1.14). It also constitutes the first study of a sucrose phosphate synthase from a non-photosynthetic thermohalophilic anaerobic bacterium, Halothermothrix orenii. The purified recombinant spsA protein has been crystallized in the monoclinic space group C2, with unit-cell parameters a = 154.2, b = 47.9, c = 72.3 A, beta = 103.16 degrees, using the hanging-drop vapour-diffusion method. The crystal diffracts X-rays to a resolution limit of 3.01 A. Heavy-metal and halide-soaking trials are currently in progress to solve the structure.