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Crystallization and preliminary X-ray diffraction studies of a 40 kDa calcium binding protein specifically expressed in plasmodia of Physarum polycephalum.

A calcium binding protein with a molecular mass of 40 kDa (CBP40), the gene product of plasmodial-specific LAV1-2 of Physarum polycephalum, was crystallized in the presence of EDTA. The crystals diffracted X-rays up to a resolution of 3.0 A. They belonged to the trigonal space group, P3221 (or P3121), with unit cell dimensions of a = b = 64.4 A and c = 207.2 A. Ca2+-bound crystals were obtained by soaking in a CaCl2 solution, which gave diffraction data of similar quality. The Ca2+-soaked crystals belonged to the same space group as those crystallized in the presence of EDTA with unit cell dimensions of a = b = 64.4 A and c = 209.4 A.