4zah

Crystal structure of sugar aminotransferase WecE with External Aldimine VII from Escherichia coli K-12

spinqualitylabelsall models 4zah, resolution 2.24Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4zah is a 8 chain structure with sequence from Ecoli. This structure supersedes the now removed PDB entry 4wfp. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: T5K Related: 4piw Gene: rffA, wecE, yifI, b3791, JW3765 (ECOLI) Activity: dTDP-4-amino-4,6-dideoxygalactose transaminase, with EC number 2.6.1.59 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RFFA_ECOLI] Sugar aminotransferase involved in enterobacterial common antigen (ECA) elongation. Publication Abstract from PubMed Sugar aminotransferases (SATs) are an important class of tailoring enzymes that catalyze the 5'-pyridoxal phosphate (PLP)-dependent stereo- and regio- specific installation of an amino group from an amino acid donor (typically L-Glu or L-Gln) to a corresponding ketosugar nucleotide acceptor. Herein we report the strategic structural study of two homologous C4 SATs (Micromonospora echinospora CalS13 and Escherichia coli WecE) that utilize identical substrates but differ in their stereochemistry of aminotransfer. This study reveals for the first time a new mode of SAT sugar nucleotide binding and, in conjunction with previously reported SAT structural studies, provides the basis from which to propose a universal model for SAT stereo- and regiochemical control of amine installation. Specifically, the universal model put forth highlights catalytic divergence to derive solely from distinctions within nucleotide sugar orientation upon binding within a relatively fixed SAT active site where the available ligand bound structures of the three out of four representative C3 and C4 SAT examples provide a basis for the overall model. Importantly, this study presents a new predictive model to support SAT functional annotation, biochemical study and rational engineering. The structural basis for the stereochemical control of amine installation in nucleotide sugar aminotransferases.,Wang F, Singh S, Xu W, Helmich KF, Miller MD, Cao H, Bingman CA, Thorson JS, Phillips GN ACS Chem Biol. 2015 May 29. PMID:26023720 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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