3ej7

Structural and mechanistic analysis of trans-3-chloroacrylic acid dehalogenase activity

spinqualitylabelsall models 3ej7, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ej7 is a 12 chain structure with sequence from Pseudomonas pavonaceae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9EV85_PSEPV 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 Trans-3-chloroacrylic acid dehalogenase (CaaD) is a critical enzyme in the trans-1,3-dichloropropene (DCP) degradation pathway in Pseudomonas pavonaceae 170. This enzyme allows bacteria to use trans-DCP, a common component in commercially produced fumigants, as a carbon source. CaaD specifically catalyzes the fourth step of the pathway by cofactor-independent dehalogenation of a vinyl carbon-halogen bond. Previous studies have reported an X-ray structure of CaaD under acidic conditions with a covalent modification of the catalytic betaPro1 residue. Here, the 1.7 A resolution X-ray structure of CaaD under neutral (pH 6.5) conditions is reported without the presence of the covalent adduct. In this new structure, a substrate-like acetate molecule is bound within the active site in a position analogous to the putative substrate-binding site. Additionally, a catalytically important water molecule was identified, consistent with previously proposed reaction schemes. Finally, flexibility of the catalytically relevant side chain alphaGlu52 is observed in the structure, supporting its role in the catalytic mechanism. Structural and mechanistic analysis of trans-3-chloroacrylic acid dehalogenase activity.,Pegan SD, Serrano H, Whitman CP, Mesecar AD Acta Crystallogr D Biol Crystallogr. 2008 Dec;64(Pt 12):1277-82. Epub 2008, Nov 18. PMID:19018104 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dehalogenase 3D structures

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