title: Crystallization and preliminary X-ray crystallographic study of leucyl-tRNA synthetase from the archaeon Pyrococcus horikoshii.
abstract: The leucyl-tRNA synthetase (LeuRS) from the archaeon Pyrococcus horikoshii was overexpressed in a C-terminally truncated form in Escherichia coli, purified and crystallized by the hanging-drop vapour-diffusion method using ammonium sulfate as a precipitant. The crystals belong to the rhombohedral space group R3, with unit-cell parameters a = b = 186.20, c = 91.43 A, alpha = beta = 90, gamma = 120 degrees. The asymmetric unit contains one molecule of LeuRS, with a corresponding crystal volume per protein weight of 3.2 A3 Da(-1) and a solvent content of 60.7%. A data set diffracting to 2.2 A resolution was collected from a single crystal at 100 K. Selenomethionine-substituted protein crystals were prepared in order to solve the structure by the SAD phasing method.
authors.affiliation: Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Japan.
authors.forename: Ryuya
authors.initials: R
authors.lastname: Fukunaga
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Yokoyama
mesh_terms: D018360:Crystallography, X-Ray / Q000379:methods; D004926:Escherichia coli / Q000378:metabolism; D007935:Leucine-tRNA Ligase / Q000737:chemistry*; D043902:Pyrococcus horikoshii / Q000201:enzymology*; D012645:Selenomethionine / Q000737:chemistry; D013696:Temperature
chemical_list: D012645:Selenomethionine; D007935:Leucine-tRNA Ligase