3oqe | pdb_00003oqe

Structure of OpdA mutant Y257F

spinqualitylabelsall models 3oqe, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3oqe is a 1 chain structure with sequence from "achromobacter_radiobacter"_(beijerinck_and_van_delden_1902)_bergey_et_al._1934 "achromobacter radiobacter" (beijerinck and van delden 1902) bergey et al. 1934. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CO, EDO NonStd Res: KCX Related: 3ood Gene: opdA ("Achromobacter radiobacter" (Beijerinck and van Delden 1902) Bergey et al. 1934) Activity: Aryldialkylphosphatase, with EC number 3.1.8.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The OP (organophosphate)-degrading enzyme from Agrobacterium radiobacter (OpdA) is a binuclear metallohydrolase able to degrade highly toxic OP pesticides and nerve agents into less or non-toxic compounds. In the present study, the effect of metal ion substitutions and site-directed mutations on the catalytic properties of OpdA are investigated. The study shows the importance of both the metal ion composition and a hydrogen-bond network that connects the metal ion centre with the substrate-binding pocket using residues Arg254 and Tyr257 in the mechanism and substrate specificity of this enzyme. For the Co(II) derivative of OpdA two protonation equilibria (pKa1 ~5; pKa2 ~10) have been identified as relevant for catalysis, and a terminal hydroxide acts as the likely hydrolysis-initiating nucleophile. In contrast, the Zn(II) and Cd(II) derivatives only have one relevant protonation equilibrium (pKa ~4-5), and the muOH is the proposed nucleophile. The observed mechanistic flexibility may reconcile contrasting reaction models that have been published previously and may be beneficial for the rapid adaptation of OP-degrading enzymes to changing environmental pressures. The organophosphate-degrading enzyme from Agrobacterium radiobacter displays mechanistic flexibility for catalysis.,Ely F, Hadler KS, Gahan LR, Guddat LW, Ollis DL, Schenk G Biochem J. 2010 Nov 25;432(3):565-73. PMID:20868365 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphotriesterase

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