3wwe | pdb_00003wwe

The complex of pOPH with PEG

spinqualitylabelsall models 3wwe, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wwe is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AE3 Related: 3wwc, 3wwd Activity: Beta-diketone hydrolase, with EC number 3.7.1.7 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Oxidized polyvinyl alcohol hydrolase (OPH) catalyzes the cleavage of C-C bond in beta-diketone. It belongs to the alpha/beta-hydrolase family and contains a unique lid region that covers the active site. The lid is the most variable region when pOPH from Pseudomonas sp. VM15C and sOPH from Sphingopyxis sp. 113P3 are compared. The wild-type enzymes and the pOPH mutants W255A, W255Y and W255F were analyzed for lipase activity by using p-nitrophenyl (pNP) esters as the substrates. The wild-type enzymes showed increased Km and decreased kcat/Km with the acyl chain length, and the mutants showed reduced kcat/Km for pNP acetate, indicating the importance of Trp255 in sequestering the active site from solvent. The significantly lower activity for pNP butyrate can be a result of product inhibition, as suggested by the complex crystal structures, in which butyric acid, DMSO or PEG occupied the same substrate-binding cleft. The mutant activity was retained with pNP caprylate and pNP laurate as the substrates, reflecting the amphipathic nature of the cleft. Moreover, the disulfide bond formation of Cys257/267 is important for the activity of pOPH, but it is not essential for sOPH, which has a shorter lid structure. Roles of tryptophan residue and disulfide bond in the variable lid region of oxidized polyvinyl alcohol hydrolase.,Yang Y, Ko TP, Liu L, Li J, Huang CH, Chen J, Guo RT, Du G Biochem Biophys Res Commun. 2014 Sep 26;452(3):509-14. doi:, 10.1016/j.bbrc.2014.08.106. Epub 2014 Aug 27. PMID:25173935 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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