Abstract
Aspartate racemase from Pyrococcus horikoshii OT3 (P. AspR) has been crystallized in three crystal forms by the sitting-drop vapour-diffusion method. The crystals belong to the space groups P2(1), P2(1)2(1)2(1) and P3(1)21 (or P3(2)21). The crystals of space group P2(1) diffract X-rays beyond 1.7 A resolution under 90 K liquid-nitrogen cryoconditions with synchrotron radiation and were selected for structure determination. Two heavy-atom derivatives of this crystal form were obtained by the soaking method, which afforded the initial electron-density map.
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