3czk

Crystal Structure Analysis of Sucrose hydrolase(SUH) E322Q-sucrose complex

spinqualitylabelsall models 3czk, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3czk is a 1 chain structure with sequence from Xanthomonas citri pv. glycines. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: FRU, GLC, PRD_900003 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q6UVM5_XANCG 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 Neisseria polysaccharea amylosucrase (NpAS), a transglucosidase of glycoside hydrolase family 13, is a hydrolase and glucosyltransferase that catalyzes the synthesis of amylose-like polymer from a sucrose substrate. Recently, an NpAS homolog from Xanthomonas axonopodis pv. glycines was identified as a member of the newly defined carbohydrate utilization locus that regulates the utilization of plant sucrose in phytopathogenic bacteria. Interestingly, this enzyme is exclusively a hydrolase and not a glucosyltransferase; it is thus known as sucrose hydrolase (SUH). Here, we elucidated the novel functional features of SUH using X-ray crystallography and site-directed mutagenesis. Four different crystal structures of SUH, including the SUH-Tris and the SUH-sucrose and SUH-glucose complexes, represent structural snapshots along the catalytic reaction coordinate. These structures show that SUH is distinctly different from NpAS in that ligand-induced conformational changes in SUH cause the formation of a pocket-shaped active site and in that SUH lacks the three arginine residues found in the NpAS active site that appear to be crucial for NpAS glucosyltransferase activity. Mutation of SUH to insert these arginines failed to confer glucosyltransferase activity, providing evidence that its enzymatic activity is limited to sucrose hydrolysis by its pocket-shaped active site and the identity of residues in the vicinity of the active site. Crystal structures and mutagenesis of sucrose hydrolase from Xanthomonas axonopodis pv. glycines: insight into the exclusively hydrolytic amylosucrase fold.,Kim MI, Kim HS, Jung J, Rhee S J Mol Biol. 2008 Jul 18;380(4):636-47. Epub 2008 May 28. PMID:18565544 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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