Acta Crystallographica Section D

Biological Crystallography

Volume 69, Part 6 (June 2013)

research papers

Acta Cryst. (2013). D69, 1108-1114    [ doi:10.1107/S0907444913006021 ]

Structure of 2-haloacid dehalogenase from Pseudomonas syringae pv. tomato DC3000

Z. Hou, H. Zhang, M. Li and W. Chang

Abstract: 2-Haloacid dehalogenases (2-HADs) catalyse the hydrolytic dehalogenation of 2-haloalkanoic acids, cleaving the carbon-halide bond at the C[alpha]-atom position and releasing a halogen atom. These enzymes are of interest for their potential use in bioremediation and in the synthesis of industrial chemicals. Here, the crystal structure of 2-HAD from Pseudomonas syringae pv. tomato DC3000 (ps-2-HAD) at 1.98 Å resolution solved using the single-wavelength anomalous dispersion method is reported. The ps-2-HAD molecule consists of two structurally distinct domains: the core domain and the subdomain. Enzymatic activity analysis of ps-2-HAD revealed its capacity to catalyse the dehalogenation of both L- and D-substrates; however, the structure of ps-2-HAD is completely different from that of DehI, which is the only DL-2-HAD enzyme that has been structurally characterized, but shows similar overall folding to L-HADs. Single mutations of four amino-acid residues at the putative active site showed that they are related to its enzymatic activity, yet three of them are nonconserved among HADs. These observations imply that ps-2-HAD has a novel active site and a unique catalytic behaviour compared with other HADs. This study provides a structural basis and biochemical evidence for further elucidation of the catalytic mechanism of 2-HAD.

PDB reference: 3vay

Keywords: 2-haloacid dehalogenases; mutation; enzymatic activity.

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[ doi:10.1107/S0907444913006021/xb5068sup1.pdf ]
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