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Characterization of different crystal forms of the α-glucosidase MalA from \u3ci\u3eSulfolobus solfataricus\u3c/i\u3e

By Heidi Asschenfeldt Ernst, Martin Willemoës, Leila Lo Leggio, Gordon Leonard, Paul H. Blum and Sine Larsen


MalA is an _-glucosidase from the hyperthermophilic archaeon Sulfolobus solfataricus. It belongs to glycoside hydrolase family 31, which includes several medically interesting α-glucosidases. MalA and its selenomethionine derivative have been overproduced in Escherichia coli and crystallized in four different crystal forms. Microseeding was essential for the formation of good-quality crystals of forms 2 and 4. For three of the crystal forms (2, 3 and 4) full data sets could be collected. The most suitable crystals for structure determination are the monoclinic form 4 crystals, belonging to space group P21, from which data sets extending to 2.5 Å resolution have been collected. Self-rotation functions calculated for this form and for the orthorhombic (P212121) form 2 indicate the presence of six molecules in the asymmetric unit related by 32 symmetry

Topics: Biology, Life Sciences
Publisher: DigitalCommons@University of Nebraska - Lincoln
Year: 2005
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