2w3p

BoxC crystal structure

spinqualitylabelsall models 2w3p, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2w3p is a 2 chain structure with sequence from Paraburkholderia xenovorans LB400. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.5Å Ligands: BME, GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q13WK7_PARXL 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 The mineralization of aromatic compounds by microorganisms relies on a structurally and functionally diverse group of ring-cleaving enzymes. The recently discovered benzoate oxidation pathway in Burkholderia xenovorans LB400 encodes a novel such ring-cleaving enzyme, termed BoxC, that catalyzes the conversion of 2,3-dihydro-2,3-dihydroxybenzoyl-CoA to 3,4-dehydroadipyl-CoA without the requirement for molecular oxygen. Sequence analysis indicates that BoxC is a highly divergent member of the crotonase superfamily and nearly double the size of the average superfamily member. The structure of BoxC determined to 1.5 A resolution reveals an intriguing structural demarcation. A highly divergent region in the C terminus probably serves as a structural scaffold for the conserved N terminus that encompasses the active site and, in conjunction with a conserved C-terminal helix, mediates dimer formation. Isothermal titration calorimetry and molecular docking simulations contribute to a detailed view of the active site, resulting in a compelling mechanistic model where a pair of conserved glutamate residues (Glu146 and Glu168) work in tandem to deprotonate the dihydroxylated ring substrate, leading to cleavage. A final deformylation step incorporating a water molecule and Cys111 as a general base completes the formation of 3,4-dehydroadipyl-CoA product. Overall, this study establishes the basis for BoxC as one of the most divergent members of the crotonase superfamily and provides the first structural insight into the mechanism of this novel class of ring-cleaving enzymes. Structural and biophysical characterization of BoxC from Burkholderia xenovorans LB400: a novel ring-cleaving enzyme in the crotonase superfamily.,Bains J, Leon R, Boulanger MJ J Biol Chem. 2009 Jun 12;284(24):16377-85. Epub 2009 Apr 15. PMID:19369256 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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