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This is a report on the structure determination of AmyB, the second α-amylase from Halothermothrix orenii, by X-ray crystallography. This bacterium was isolated from saltpans where conditions consisted of both high temperatures and high NaCl content. AmyB is a 599-­residue protein which is stable and significantly active at 358 K in starch solution containing up to 10%(w/v) NaCl. The purified recombinant AmyB protein crystallizes in the monoclinic space group C2, with unit-cell parameters a = 225.85, b = 77.16, c = 50.13 Å, β = 99.32°, using the hanging-drop vapour-diffusion method. The crystal diffracts X-­rays to a resolution limit of 1.97 Å.
Keywords: α-amylases.

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