title: Crystallization and preliminary crystallographic analysis of 2-keto-3-deoxygluconate kinase from Thermus thermophilus.
abstract: 2-Keto-3-deoxygluconate kinase (KDGK) catalyzes the phosphorylation of 2-keto-3-deoxygluconate (KDG) to 2-keto-3-deoxy-6-phosphogluconate. Two crystal forms of KDGK from Thermus thermophilus were obtained by vapour-diffusion and microbatch methods. Crystals in the form of triangular plates (TtKDGK-1) were obtained that belong to space group P3, with unit-cell parameters a = b = 145.83, c = 74.63 A, and diffract to 3.2 A. These crystals exhibited nearly perfect hemihedral twinning. Assigning six subunits of TtKDGK to the asymmetric unit of the crystal corresponds to a 46.2% solvent content. A single plate-like crystal (TtKDGK-2) belonged to space group P6(3), with unit-cell parameters a = b = 84.83, c = 168.49 A, and diffracts to 2.25 A. This crystal exhibits only partial hemihedral twinning, with a twin fraction of 24.4%. Diffraction-quality crystals of TtKDGK with bound ATP (TtKDGK-ATP), a = b = 84.72, c = 321.61 A and with bound KDG plus the ATP analogue AMP-PNP (TtKDGK-ATP-KDG), with unit-cell parameters a = b = 84.32, c = 168.7 A, were also prepared and characterized.
authors.affiliation: Highthroughput Factory, RIKEN Harima Institute, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Inagaki
authors.forename: Yoko
authors.initials: Y
authors.lastname: Ukita
authors.forename: Maki
authors.initials: M
authors.lastname: Kumei
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kajihara
authors.forename: Tahir H
authors.initials: TH
authors.lastname: Tahirov
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry / Q000378:metabolism; D000266:Adenylyl Imidodiphosphate / Q000737:chemistry / Q000378:metabolism; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D005942:Gluconates / Q000737:chemistry / Q000378:metabolism; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000737:chemistry* / Q000378:metabolism; D011485:Protein Binding; D020033:Protein Isoforms / Q000737:chemistry / Q000378:metabolism; D016963:Thermus thermophilus / Q000737:chemistry*
chemical_list: D005942:Gluconates; D020033:Protein Isoforms; C002957:2-keto-3-deoxygluconate; D000266:Adenylyl Imidodiphosphate; D000255:Adenosine Triphosphate; D017853:Phosphotransferases (Alcohol Group Acceptor); C021471:2-keto-3-deoxygluconokinase