3hq0 | pdb_00003hq0

Crystal Structure Analysis of the 2,3-dioxygenase LapB from Pseudomonas in complex with a product

spinqualitylabelsall models 3hq0, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hq0 is a 4 chain structure with sequence from "pseudomonas_alkylphenolia"_veeranagouda_et_al._2009 "pseudomonas alkylphenolia" veeranagouda et al. 2009. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FE, M3P Related: 3hpy Activity: Catechol 2,3-dioxygenase, with EC number 1.13.11.2 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed LapB is a non-heme Fe(II)-dependent 2,3-dioxygenase that catalyzes the second step of a long-chain alkylphenol (lap) degradation pathway in Pseudomonas sp. KL28 and belongs to the superfamily of type I extradiol dioxygenases. In this study, the crystal structures of substrate-free LapB and its complexes with a substrate or product were determined, along with a functional analysis of the active site residues. Structural features of the homotetramer are similar to those of other type I extradiol dioxygenases. In particular, the active site is located in the C-domain of each monomer, with a 2-His-1-carboxylate motif as the first coordination shell to iron ion. A comparison of three different structures in the catalytic cycle indicated catalysis-related local conformational changes in the active site. Specifically, the active site loop containing His-248 exhibits positional changes upon binding of the substrate and establishes a hydrogen-bonding network with Tyr-257, which is near the hydroxyl group of the substrate. Kinetic analysis of the mutant enzymes H248A, H248N, and Y257F showed that these three mutant enzymes are inactive, suggesting that this hydrogen-bonding network plays a crucial role in catalysis by deprotonating the incoming substrate and leaving it in a monoanionic state. Additional functional analysis of His-201, by using H201A and H201N mutants, near the dioxygen-binding site also supports its role as base and acid catalyst in the late stage of catalysis. We also noticed a disordered-to-ordered structural transition in the C-terminal region, resulting in the opening or closing of the active site. These results provide detailed insights into the structural and functional features of an extradiol dioxygenase that can accommodate a wide range of alkylcatechols. Crystal structure and functional analysis of the extradiol dioxygenase LapB from a long-chain alkylphenol degradation pathway in Pseudomonas.,Cho JH, Jung DK, Lee K, Rhee S J Biol Chem. 2009 Dec 4;284(49):34321-30. Epub 2009 Oct 14. PMID:19828456 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dioxygenase

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