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Xylanase B from Clostridium cellulovorans 743B: overexpression, purification, crystallization and X-ray diffraction analysis.
Acta Crystallographica. Section F, Structural Biology Communications 2018 Februrary 2
Clostridium cellulovorans produces multi-enzyme complexes called cellulosomes capable of efficiently degrading cellulosic biomass. There are three xylanase genes containing a sequence corresponding to a dockerin domain that are necessary for constructing cellulosomes in the genome. Among the xylanases encoded by these genes, xylanase B (XynB) contains a catalytic domain belonging to glycoside hydrolase family 10 and a carbohydrate-binding module (CBM) at the N-terminus, making it a member of CBM family 22. In this study, XynB was cloned, overexpressed, purified and crystallized. XynB was crystallized using the hanging-drop vapour-diffusion method in the presence of 0.2 M sodium acetate trihydrate, 0.1 M Tris-HCl pH 8.5, 32%(w/v) PEG 4000 at 293 K. X-ray diffraction analysis revealed that the crystal diffracted to 1.95 Å resolution and belonged to space group P21 21 21 , with unit-cell parameters a = 74.28, b = 77.55, c = 88.20 Å, α = β = γ = 90°. The data-evaluation statistics revealed high quality of the collected data, thereby establishing a solid basis for determination of the structure of cellulosomal xylanase from C. cellulovorans.
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