3wib

Crystal structure of Y109W Mutant Haloalkane Dehalogenase DatA from Agrobacterium tumefaciens C58

spinqualitylabelsall models 3wib, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wib is a 2 chain structure with sequence from Agrobacterium fabrum str. C58. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.95Å Ligands: NHE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DHAA_AGRFC Catalyzes hydrolytic cleavage of carbon-halogen bonds in halogenated aliphatic compounds, leading to the formation of the corresponding primary alcohols, halide ions and protons.[HAMAP-Rule:MF_01231] Publication Abstract from PubMed A novel haloalkane dehalogenase DatA from Agrobacterium tumefaciens C58 belongs to the HLD-II subfamily and hydrolyzes brominated and iodinated compounds, leading to the generation of the corresponding alcohol, a halide ion, and a proton. Because DatA possesses a unique Asn-Tyr pair instead of the Asn-Trp pair conserved among the subfamily members, which was proposed to keep the released halide ion stable, the structural basis for its reaction mechanism should be elucidated. Here, we determined the crystal structures of DatA and its Y109W mutant at 1.70 and 1.95 A, respectively, and confirmed the location of the active site by using its novel competitive inhibitor. The structural information from these two crystal structures and the docking simulation suggested that (i) the replacement of the Asn-Tyr pair with the Asn-Trp pair increases the binding affinity for some halogenated compounds, such as 1,3-dibromopropane, mainly due to the electrostatic interaction between Trp109 and halogenated compounds and the change of substrate-binding mode caused by the interaction and (ii) the primary halide-stabilizing residue is only Asn43 in the wild-type DatA, while Tyr109 is a secondary halide-stabilizing residue. Furthermore, docking simulation using the crystal structures of DatA indicated that its enantioselectivity is determined by the large and small spaces around the halogen-binding site. Crystal structure of the novel haloalkane dehalogenase DatA from Agrobacterium tumefaciens C58 reveals a special halide-stabilizing pair and enantioselectivity mechanism.,Guan L, Yabuki H, Okai M, Ohtsuka J, Tanokura M Appl Microbiol Biotechnol. 2014 Apr 29. PMID:24770384 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dehalogenase 3D structures

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