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Crystallization and preliminary X-ray analysis of the Clostridium thermocellum cellulosome xylanase Z feruloyl
D L Blum1, F D Schubot, L G Ljungdahl
1Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA.
Abstract:
Feruloyl esterases cleave ferulic acid from arabinoxylan and pectin. Feruloyl groups are believed to crosslink the polysaccharide chain within the polymer and to link hemicellulose to lignin, which may play a role in controlling the growth of plants. The Clostridium thermocellum cellulosome xylanase Z feruloyl esterase was expressed in Escherichia coli, purified and crystallized. The crystals diffract to 2.4 A resolution and belong to the orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 43.14, b = 63.77, c = 79.57 A. Assuming one molecule per asymmetric unit, the Matthews coefficient is calculated to be 1.87 A(3) Da(-1), which corresponds to a solvent content of 34%.
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