title: Crystallization and preliminary X-ray diffraction studies of the catalytic domain of a novel chitinase, a member of GH family 23, from the moderately thermophilic bacterium Ralstonia sp. A-471.
abstract: Chitinase from the moderately thermophilic bacterium Ralstonia sp. A-471 (Ra-ChiC) is divided into two domains: a chitin-binding domain (residues 36-80) and a catalytic domain (residues 103-252). Although the catalytic domain of Ra-ChiC has homology to goose-type lysozyme, Ra-ChiC does not show lysozyme activity but does show chitinase activity. The catalytic domain with part of an interdomain loop (Ra-ChiC(89-252)) was crystallized under several different conditions using polyethylene glycol as a precipitant. The crystals diffracted to 1.85 Å resolution and belonged to space group P6(1)22 or P6(5)22, with unit-cell parameters a = b = 100, c = 243 Å. The calculated Matthews coefficient was approximately 3.2, 2.4 or 1.9 Å(3) Da(-1) assuming the presence of three, four or five Ra-ChiC(89-252) molecules in the asymmetric unit, respectively.
authors.affiliation: Quantum Beam Science Directorate, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Nobuo
authors.initials: N
authors.lastname: Okazaki
authors.forename: Takao
authors.initials: T
authors.lastname: Arimori
authors.forename: Masami
authors.initials: M
authors.lastname: Nakazawa
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Miyatake
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Ueda
authors.forename: Taro
authors.initials: T
authors.lastname: Tamada
mesh_terms: D020134:Catalytic Domain; D002688:Chitinases / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D043367:Ralstonia / Q000201:enzymology*
chemical_list: D002688:Chitinases