2x8s | pdb_00002x8s

Crystal Structure of the Abn2 D171A mutant in complex with arabinotriose

spinqualitylabelsall models 2x8s, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2x8s is a 2 chain structure with sequence from "vibrio_subtilis"_ehrenberg_1835 "vibrio subtilis" ehrenberg 1835. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AHR, CA, CL, GOL, MPD, NA, PO4, TRS Related: 2x8t, 2x8f Activity: Arabinan endo-1,5-alpha-L-arabinosidase, with EC number 3.2.1.99 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [EABN2_BACSU] Involved in the degradation of arabinan and is a key enzyme in the complete degradation of the plant cell wall. Catalyzes the internal cleavage of alpha-(1->5)-L-arabinofuranosyl residues of the alpha-1,5-L-arabinan to produce arabino-oligosaccharides and L-arabinose. It is also active toward linear branched sugar beet arabinan, and pectin from apple. Publication Abstract from PubMed Endo-1,5-alpha-l-arabinanases are glycosyl hydrolases that are able to cleave the glycosidic bonds of alpha-1,5-l-arabinan, releasing arabino-oligosaccharides and l-arabinose. Two extracellular endo-1,5-alpha-l-arabinanases have been isolated from Bacillus subtilis, BsArb43A and BsArb43B (formally named AbnA and Abn2, respectively). BsArb43B shows low sequence identity with previously characterized 1,5-alpha-l-arabinanases and is a much larger enzyme. Here we describe the 3D structure of native BsArb43B, biochemical and structure characterization of two BsArb43B mutant proteins (H318A and D171A), and the 3D structure of the BsArb43B D171A mutant enzyme in complex with arabinohexose. The 3D structure of BsArb43B is different from that of other structurally characterized endo-1,5-alpha-l-arabinanases, as it comprises two domains, an N-terminal catalytic domain, with a 3D fold similar to that observed for other endo-1,5-alpha-l-arabinanases, and an additional C-terminal domain. Moreover, this work also provides experimental evidence for the presence of a cluster containing a calcium ion in the catalytic domain, and the importance of this calcium ion in the enzymatic mechanism of BsArb43B. New evidence for the role of calcium in the glycosidase reaction of GH43 arabinanases.,De Sanctis D, Inacio JM, Lindley PF, De Sa-Nogueira I, Bento I FEBS J. 2010 Sep 10. doi: 10.1111/j.1742-4658.2010.07870.x. PMID:20883454 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Arabinanase

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