title: Crystallization and preliminary X-ray diffraction analysis of L-aminoacylase from the hyperthermophilic archaeon Thermococcus litoralis.
abstract: The enzyme L-aminoacylase catalyses the hydrolysis of N-acyl-L-amino acids from peptides or proteins. The recombinant enzyme from the hyperthermophilic archaeon Thermococcus litoralis has been purified to homogeneity. This zinc-containing enzyme has been crystallized from ammonium sulfate using the sitting-drop vapour-diffusion method. The crystals diffract to 2.8 A resolution and belong to the rhombohedral space group R32, with unit-cell parameters a = b = 102.4, c = 178.5 A, gamma = 120 degrees in a hexagonal lattice setting. The asymmetric unit contains one enzyme monomer, containing a single zinc ion. Two synchrotron data sets have been collected at a remote wavelength and at the maximum f'wavelength for zinc. This has allowed the position of the metal to be identified in anomalous Patterson maps.
authors.affiliation: School of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, England.
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Hollingsworth
authors.forename: Michail N
authors.initials: MN
authors.lastname: Isupov
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Littlechild
mesh_terms: D000581:Amidohydrolases / Q000737:chemistry*; D019843:Archaeal Proteins / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D011487:Protein Conformation; D019712:Thermococcus / Q000737:chemistry / Q000201:enzymology*
chemical_list: D019843:Archaeal Proteins; D000581:Amidohydrolases; C019672:aminoacylase I