4xb3 | pdb_00004xb3

Structure of dextran glucosidase

spinqualitylabelsall models 4xb3, resolution 2.09Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4xb3 is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, P6G Activity: Glucan 1,6-alpha-glucosidase, with EC number 3.2.1.70 Resources: FirstGlance, OCA, RCSB, PDBsum Function [DEXB_STRMU] The physiological substrates may be short isomaltosaccharides. Publication Abstract from PubMed Streptococcus mutans dextran glucosidase (SmDG) belongs to glycoside hydrolase family 13, and catalyzes both the hydrolysis of substrates such as isomaltooligosaccharides and subsequent transglucosylation to form alpha-(1-->6)-glucosidic linkage at the substrate non-reducing ends. Here, we report the 2.4A resolution crystal structure of glucosyl-enzyme intermediate of SmDG. In the obtained structure, the Trp238 side-chain that constitutes the substrate-binding site turned away from the active pocket, concurrently with conformational changes of the nucleophile and the acid/base residues. Different conformations of Trp238 in each reaction stage indicated its flexibility. Considering the results of kinetic analyses, such flexibility may reflect a requirement for the reaction mechanism of SmDG. Structural insights into the catalytic reaction that is involved in the reorientation of Trp238 at the substrate-binding site in GH13 dextran glucosidase.,Kobayashi M, Saburi W, Nakatsuka D, Hondoh H, Kato K, Okuyama M, Mori H, Kimura A, Yao M FEBS Lett. 2015 Feb 13;589(4):484-9. doi: 10.1016/j.febslet.2015.01.005. Epub, 2015 Jan 14. PMID:25595454 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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