title: Crystallization and preliminary X-ray analysis of D-2-hydroxyacid dehydrogenase from Haloferax mediterranei.
abstract: D-2-hydroxyacid dehydrogenase (D2-HDH) from Haloferax mediterranei has been overexpressed in Escherichia coli, solubilized in 8 M urea and refolded by rapid dilution. The protein was purified and crystallized by the hanging-drop vapour-diffusion method using ammonium sulfate or PEG 3350 as precipitant. Two crystal forms representing the free enzyme and the nonproductive ternary complex with alpha-ketohexanoic acid and NAD(+) grew under these conditions. Crystals of form I diffracted to beyond 3.0 A resolution and belonged to the monoclinic space group P2(1), with unit-cell parameters a = 66.0, b = 119.6, c = 86.2 A, beta = 96.3 degrees . Crystals of form II diffracted to beyond 2.0 A resolution and belonged to the triclinic space group P1, with unit-cell parameters a = 66.5, b = 75.2, c = 77.6 A, alpha = 109.1, beta = 107.5, gamma = 95.9 degrees. The calculated values for V(M) and analysis of the self-rotation and self-Patterson functions suggest that the asymmetric unit in both crystal forms contains two dimers related by pseudo-translational symmetry.
authors.affiliation: Departamento de Agroquímica y Bioquímica, División de Bioquímica, Facultad de Ciencias, Universidad de Alicante, Apartado, Alicante, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Domenech
authors.forename: P J
authors.initials: PJ
authors.lastname: Baker
authors.forename: S E
authors.initials: SE
authors.lastname: Sedelnikova
authors.forename: H F
authors.initials: HF
authors.lastname: Rodgers
authors.forename: D W
authors.initials: DW
authors.lastname: Rice
authors.forename: J
authors.initials: J
authors.lastname: Ferrer