1ux7

Carbohydrate-Binding Module CBM36 in complex with calcium and xylotriose

spinqualitylabelsall models 1ux7, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ux7 is a 1 chain structure with sequence from "aerobacillus_polymyxa"_(prazmowski_1880)_donker_1926 "aerobacillus polymyxa" (prazmowski 1880) donker 1926. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, SO4, XYP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [XYND_PAEPO] Cleaves arabinose units from O-2- or O-3-monosubstituted xylose residues, thereby assisting in arabinoxylan (AX) and short-chain arabinoxylo-oligosaccharide (AXOS) degradation (By similarity). Preferres wheat flour xylan over oat spelt xylan as substrate. Does not display endoxylanase activity. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The enzymatic degradation of polysaccharides harnesses multimodular enzymes whose carbohydrate binding modules (CBM) target the catalytic domain onto the recalcitrant substrate. Here we report the ab initio structure determination and subsequent refinement, at 0.8 A resolution, of the CBM36 domain of the Paenibacillus polymyxa xylanase 43A. Affinity electrophoresis, isothermal titration calorimetry, and UV difference spectroscopy demonstrate that CBM36 is a novel Ca(2+)-dependent xylan binding domain. The 3D structure of CBM36 in complex with xylotriose and Ca(2+), at 1.5 A resolution, displays significant conformational changes compared to the native structure and reveals the molecular basis for its unique Ca(2+)-dependent binding of xylooligosaccharides through coordination of the O2 and O3 hydroxyls. CBM36 is one of an emerging spectrum of carbohydrate binding modules that increasingly find applications in industry and display great potential for mapping the "glyco-architecture" of plant cells. Ab initio structure determination and functional characterization of CBM36; a new family of calcium-dependent carbohydrate binding modules.,Jamal-Talabani S, Boraston AB, Turkenburg JP, Tarbouriech N, Ducros VM, Davies GJ Structure. 2004 Jul;12(7):1177-87. PMID:15242594 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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