4hph | pdb_00004hph

The crystal structure of isomaltulose synthase mutant E295Q from Erwinia rhapontici NX5 in complex with its natural substrate sucrose

spinqualitylabelsall models 4hph, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4hph is a 1 chain structure with sequence from Erwinia rhapontici. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, FRU, GLC, GOL, PRD_900003 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function D9MPF2_ERWRD Publication Abstract from PubMed Sucrose isomerase NX-5 from Erwiniarhapontici efficiently catalyzes the isomerization of sucrose to isomaltulose (main product) and trehalulose (by-product). To investigate the molecular mechanism controlling sucrose isomer formation, we determined the crystal structures of native NX-5 and its mutant complexes E295Q/sucrose and D241A/glucose at 1.70 A, 1.70 A and 2.00 A, respectively. The overall structure and active site architecture of NX-5 resemble those of other reported sucrose isomerases. Strikingly, the substrate binding mode of NX-5 is also similar to that of trehalulose synthase from Pseudomonasmesoacidophila MX-45 (MutB). Detailed structural analysis revealed the catalytic RXDRX motif and the adjacent 10-residue loop of NX-5 and isomaltulose synthase PalI from Klebsiella sp. LX3 adopt a distinct orientation from those of trehalulose synthases. Mutations of the loop region of NX-5 resulted in significant changes of the product ratio between isomaltulose and trehalulose. The molecular dynamics simulation data supported the product specificity of NX-5 towards isomaltulose and the role of the loop(330-339) in NX-5 catalysis. This work should prove useful for the engineering of sucrose isomerase for industrial carbohydrate biotransformations. The Structural Basis of Erwinia rhapontici Isomaltulose Synthase.,Xu Z, Li S, Li J, Li Y, Feng X, Wang R, Xu H, Zhou J PLoS One. 2013 Sep 19;8(9):e74788. doi: 10.1371/journal.pone.0074788. PMID:24069347 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Trehalulose synthase

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