6ktk

Crystal structure of scyllo-inositol dehydrogenase R178A mutant, complexed with NADH and L-glucono-1,5-lactone, from Paracoccus laeviglucosivorans

spinqualitylabelsall models 6ktk, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ktk is a 4 chain structure with sequence from Paracoccus laeviglucosivorans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.65Å Ligands: 8S0, NAI, PG4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function K7ZP76_9RHOB Publication Abstract from PubMed scyllo-inositol dehydrogenase, isolated from Paracoccus laeviglucosivorans (Pl-sIDH), exhibits a broad substrate specificity: it oxidizes scyllo- and myo-inositols as well as L-glucose, converting L-glucose to L-glucono-1,5-lactone. Based on the crystal structures previously reported, Arg178 residue, located at the entry port of the catalytic site, seemed to be important for accepting substrates. Here, we report the role of Arg178 by using an alanine-substituted mutant for kinetic analysis as well as to determine the crystal structures. The wild-type Pl-sIDH exhibits the activity for scyllo-inositol most preferably followed by myo-inositol and L-glucose. On the contrary, the R178A mutant abolished the activities for both inositols, but remained active for L-glucose to the same extent as its wild-type. Based on the crystal structures of the mutant, the side chain of Asp191 flipped out of the substrate binding site. Therefore, Arg178 is important in positioning Asp191 correctly to exert its catalytic activities.Abbreviations: IDH: inositol dehydrogenase; LB: Luria-Bertani; kcat: catalyst rate constant; Km: Michaelis constant; NAD: nicotinamide dinucleotide; NADH: nicotinamide dinucleotide reduced form; PDB; Protein Data Bank; PDB entry: 6KTJ, 6KTK, 6KTL. Single amino acid mutation altered substrate specificity for L-glucose and inositol in scyllo-inositol dehydrogenase isolated from Paracoccus laeviglucosivorans.,Suzuki M, Koubara K, Takenoya M, Fukano K, Ito S, Sasaki Y, Nakamura A, Yajima S Biosci Biotechnol Biochem. 2019 Dec 16:1-9. doi: 10.1080/09168451.2019.1702870. PMID:31842701 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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