5brq | pdb_00005brq

Crystal structure of Bacillus licheniformis trehalose-6-phosphate hydrolase (TreA)

spinqualitylabelsall models 5brq, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5brq is a 4 chain structure with sequence from Bacillus licheniformis DSM 13 = ATCC 14580. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.003Å Ligands: MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q65MI2_BACLD Publication Abstract from PubMed Trehalose-6-phosphate hydrolase (TreA) belongs to glycoside hydrolase family 13 (GH13) and catalyzes the hydrolysis of trehalose 6-phosphate (T6P) to yield glucose and glucose 6-phosphate. The products of this reaction can be further metabolized by the energy-generating glycolytic pathway. Here, crystal structures of Bacillus licheniformis TreA (BlTreA) and its R201Q mutant complexed with p-nitrophenyl-alpha-D-glucopyranoside (R201Q-pPNG) are presented at 2.0 and 2.05 A resolution, respectively. The overall structure of BlTreA is similar to those of other GH13 family enzymes. However, detailed structural comparisons revealed that the catalytic site of BlTreA contains a long loop that adopts a different conformation from those of other GH13 family members. Unlike the homologous regions of Bacillus cereus oligo-1,6-glucosidase (BcOgl) and Erwinia rhapontici isomaltulose synthase (NX-5), the surface potential of the BlTreA active site exhibits a largely positive charge contributed by the four basic residues His281, His282, Lys284 and Lys292. Mutation of these residues resulted in significant decreases in the enzymatic activity of BlTreA. Strikingly, the (281)HHLK(284) motif and Lys292 play critical roles in substrate discrimination by BlTreA. Bacillus licheniformis trehalose-6-phosphate hydrolase structures suggest keys to substrate specificity.,Lin MG, Chi MC, Naveen V, Li YC, Lin LL, Hsiao CD Acta Crystallogr D Struct Biol. 2016 Jan;72(Pt 1):59-70. doi:, 10.1107/S2059798315020756. Epub 2016 Jan 1. PMID:26894535 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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