1zb9 | pdb_00001zb9

Crystal structure of Xylella fastidiosa organic peroxide resistance protein

spinqualitylabelsall models 1zb9, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1zb9 is a 2 chain structure with sequence from Xylella fastidiosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: PE4 NonStd Res: OCS Gene: ohr (Xylella fastidiosa) 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 Organic hydroperoxide resistance proteins (Ohr) belong to a family of proteins that possess thiol-dependent peroxidase activity endowed by reactive cysteine residues able to reduce peroxides. The crystal structure of Ohr from Xylella fastidiosa in complex with polyethylene glycol, providing insights into enzyme-substrate interactions is described herein. In addition, crystallographic studies, molecular modeling and biochemical assays also indicated that peroxides derived from long chain fatty acids could be the biological substrates of Ohr. Because different oxidation states of the reactive cysteine were present in the Ohr structures from X. fastidiosa, Pseudomonas aeruginosa and Deinococcus radiodurans it was possible to envisage a set of snapshots along the coordinate of the enzyme-catalyzed reaction. The redox intermediates of X. fastidiosa Ohr observed in the crystals were further characterized in solution by electrospray ionization mass spectrometry and by biochemical approaches. In this study, the formation of an intramolecular disulfide bond and oxidative inactivation through the formation of a sulfonic acid derivative was unequivocally demonstrated for the first time. Because Ohr proteins are exclusively present in bacteria, they may represent promising targets for therapeutical drugs. In this regard, the structural and functional analyses of Ohr presented here might be very useful. Structural insights into enzyme-substrate interaction and characterization of enzymatic intermediates of organic hydroperoxide resistance protein from Xylella fastidiosa.,Oliveira MA, Guimaraes BG, Cussiol JR, Medrano FJ, Gozzo FC, Netto LE J Mol Biol. 2006 Jun 2;359(2):433-45. Epub 2006 Apr 7. PMID:16631787 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Organic hydroperoxide resistance protein

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