title: An order-disorder twin crystal of L-2-haloacid dehalogenase from Sulfolobus tokodaii.
abstract: The L-2-haloacid dehalogenase enzymes catalyse the hydrolytic cleavage of a halogen from the C2 position of short-chain haloacids. The recombinant dehalogenase from the thermophilic archaeon Sulfolobus tokodaii has been cloned, overexpressed and purified to homogeneity. The 24 kDa enzyme was crystallized using the microbatch method in the monoclinic space group C2, with unit-cell parameters a = 127.6, b = 58.1, c = 51.2 A, beta = 97.2 degrees . Data were collected to 1.9 A resolution using synchrotron radiation and the structure was solved by molecular replacement. Analysis of the data and the preliminary refined model showed that the crystal was an order-disorder twin by reticular merohedry with a twin index of 10. It was possible to de-twin the experimental data utilizing the symmetry of the molecular layers from which the crystal is built.
authors.affiliation: Henry Wellcome Building for Biocatalysis, School of Biosciences, University of Exeter, Stocker Road, Exeter, England.
authors.forename: Carrie A
authors.initials: CA
authors.lastname: Rye
authors.forename: Michail N
authors.initials: MN
authors.lastname: Isupov
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Lebedev
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Littlechild
mesh_terms: D003460:Crystallization; D006867:Hydrolases / Q000737:chemistry* / Q000235:genetics; D008958:Models, Molecular; D016944:Sulfolobus / Q000201:enzymology* / Q000235:genetics; D014961:X-Ray Diffraction
chemical_list: D006867:Hydrolases; C034507:2-haloacid dehalogenase