1ug9

Crystal Structure of Glucodextranase from Arthrobacter globiformis I42

spinqualitylabelsall models 1ug9, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ug9 is a 1 chain structure with sequence from Arthrobacter globiformis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Ligands: CA, GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9LBQ9_ARTGO 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 A glucodextranase (iGDase) from Arthrobacter globiformis I42 hydrolyzes alpha-1,6-glucosidic linkages of dextran from the non-reducing end to produce beta-D-glucose via an inverting reaction mechanism and classified into the glycoside hydrolase family 15 (GH15). Here we cloned the iGDase gene and determined the crystal structures of iGDase of the unliganded form and the complex with acarbose at 2.42-A resolution. The structure of iGDase is composed of four domains N, A, B, and C. Domain A forms an (alpha/alpha)(6)-barrel structure and domain N consists of 17 antiparallel beta-strands, and both domains are conserved in bacterial glucoamylases (GAs) and appear to be mainly concerned with catalytic activity. The structure of iGDase complexed with acarbose revealed that the positions and orientations of the residues at subsites -1 and +1 are nearly identical between iGDase and GA; however, the residues corresponding to subsite 3, which form the entrance of the substrate binding pocket, and the position of the open space and constriction of iGDase are different from those of GAs. On the other hand, domains B and C are not found in the bacterial GAs. The primary structure of domain C is homologous with a surface layer homology domain of pullulanases, and the three-dimensional structure of domain C resembles the carbohydrate-binding domain of some glycohydrolases. Structural insights into substrate specificity and function of glucodextranase.,Mizuno M, Tonozuka T, Suzuki S, Uotsu-Tomita R, Kamitori S, Nishikawa A, Sakano Y J Biol Chem. 2004 Mar 12;279(11):10575-83. Epub 2003 Dec 1. PMID:14660574 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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