5joy

Bacteroides ovatus Xyloglucan PUL GH43A in complex with AraLOG

spinqualitylabelsall models 5joy, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5joy is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 6LW, EDO, TRS Activity: Non-reducing end alpha-L-arabinofuranosidase, with EC number 3.2.1.55 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [GH43A_BACO1] Alpha-L-arabinofuranosidase involved in xyloglucan degradation by mediating the cleavage of terminal non-reducing alpha-L-arabinofuranoside residues in xyloglucan branches, converting the 'S' units to 'X' units. Publication Abstract from PubMed The human gastrointestinal tract harbours myriad bacterial species, collectively termed the microbiota, that strongly influence human health. Symbiotic members of our microbiota play a pivotal role in the digestion of complex carbohydrates that are otherwise recalcitrant to assimilation. Indeed, the intrinsic human polysaccharide-degrading enzyme repertoire is limited to various starch-based substrates; more complex polysaccharides demand microbial degradation. Select Bacteroidetes are responsible for the degradation of the ubiquitous vegetable xyloglucans (XyGs), through the concerted action of cohorts of enzymes and glycan-binding proteins encoded by specific xyloglucan utilization loci (XyGULs). Extending recent (meta)genomic, transcriptomic and biochemical analyses, significant questions remain regarding the structural biology of the molecular machinery required for XyG saccharification. Here, we reveal the three-dimensional structures of an alpha-xylosidase, a beta-glucosidase, and two alpha-l-arabinofuranosidases from the Bacteroides ovatus XyGUL. Aided by bespoke ligand synthesis, our analyses highlight key adaptations in these enzymes that confer individual specificity for xyloglucan side chains and dictate concerted, stepwise disassembly of xyloglucan oligosaccharides. In harness with our recent structural characterization of the vanguard endo-xyloglucanse and cell-surface glycan-binding proteins, the present analysis provides a near-complete structural view of xyloglucan recognition and catalysis by XyGUL proteins. Structural dissection of a complex Bacteroides ovatus gene locus conferring xyloglucan metabolism in the human gut.,Hemsworth GR, Thompson AJ, Stepper J, Sobala LF, Coyle T, Larsbrink J, Spadiut O, Goddard-Borger ED, Stubbs KA, Brumer H, Davies GJ Open Biol. 2016 Jul;6(7). pii: 160142. doi: 10.1098/rsob.160142. PMID:27466444 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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