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  • Title: Crystallization and preliminary crystallographic analysis of a family 43 beta-D-xylosidase from Geobacillus stearothermophilus T-6.
    Author: Brüx C, Niefind K, Ben-David A, Leon M, Shoham G, Shoham Y, Schomburg D.
    Journal: Acta Crystallogr Sect F Struct Biol Cryst Commun; 2005 Dec 01; 61(Pt 12):1054-7. PubMed ID: 16511233.
    Abstract:
    Beta-D-Xylosidases (EC 3.2.1.37) are hemicellulases that cleave single xylose units from the nonreducing end of xylooligomers. In this study, the crystallization and preliminary X-ray analysis of a beta-D-xylosidase from Geobacillus stearothermophilus T-6 (XynB3), a family 43 glycoside hydrolase, is described. XynB3 is a 535-amino-acid protein with a calculated molecular weight of 61 891 Da. Purified recombinant native and catalytic inactive mutant proteins were crystallized and cocrystallized with xylobiose in two different space groups, P2(1)2(1)2 (unit-cell parameters a = 98.32, b = 99.36, c = 258.64 A) and P4(1)2(1)2 (or the enantiomorphic space group P4(3)2(1)2; unit-cell parameters a = b = 140.15, c = 233.11 A), depending on the detergent. Transferring crystals to cryoconditions required a very careful protocol. Orthorhombic crystals diffract to 2.5 A and tetragonal crystals to 2.2 A.
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