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Acta Crystallogr D Biol Crystallogr. 1999 Dec;55(Pt 12):2051-2.

Crystallization and preliminary X-ray diffraction data for a purple acid phosphatase from sweet potato.

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  • 1Department of Biochemistry, The University of Queensland, Brisbane, QLD 4072, Australia.


Purple acid phosphatase from sweet potato is a homodimer of 110 kDa. Two forms of the enzyme have been characterized. One contains an Fe-Zn centre similar to that previously reported for red kidney bean purple acid phosphatase. Another isoform, the subject of this work, is the first confirmed example of an Fe-Mn-containing enzyme. Crystals of this protein have been grown from PEG 6000. They have unit-cell parameters a = b = 118.4, c = 287.4 A and have the symmetry of space group P6(5)22, with one dimer per asymmetric unit. Diffraction data collected using a conventional X--ray source from a cryocooled crystal extend to 2.90 A resolution. The three-dimensional structure of the enzyme will provide insight into the coordination of this novel binuclear metal centre.

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