title: Crystallization and preliminary X-ray crystallographic analysis of Ca2+-independent and Ca2+-dependent species of the type II antifreeze protein.
abstract: Ca2+-independent and Ca2+-dependent species of the type II antifreeze protein (AFP) were both crystallized using the hanging-drop vapour-diffusion method. It appeared that the crystal of the Ca2+-independent species from Brachyosis rostratus belongs to space group P2(1)2(1)2(1), with unit-cell parameters a = 43.3, b = 48.4, c = 59.7 A, and diffraction data were collected to 1.34 A resolution. For the Ca2+-dependent type II AFP species from Hypomesus nipponensis, crystallization was carried out for its Ca2+-free and Ca2+-bound states. 1.25 A resolution data were collected from the crystal in the Ca(2+)-free state, which exhibited P3(1)21 (or P3(2)21) symmetry, with unit-cell parameters a = b = 66.0, c = 50.3 A. Data collection could be extended to 1.06 A resolution for the crystal in the Ca2+ -bound state, which appeared to be isomorphous to the crystal in the Ca2+-free state (unit-cell parameters a = b = 66.0, c = 49.8 A). These data will allow us to determine the high-resolution structures of the two species of type II AFP.
authors.affiliation: Functional Protein Research Group, Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira, Sapporo 062-8517, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nishimiya
authors.forename: Hidemasa
authors.initials: H
authors.lastname: Kondo
authors.forename: Masanori
authors.initials: M
authors.lastname: Yasui
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sugimoto
authors.forename: Natsuko
authors.initials: N
authors.lastname: Noro
authors.forename: Ryoko
authors.initials: R
authors.lastname: Sato
authors.forename: Mamoru
authors.initials: M
authors.lastname: Suzuki
authors.forename: Ai
authors.initials: A
authors.lastname: Miura
authors.forename: Sakae
authors.initials: S
authors.lastname: Tsuda
mesh_terms: D000818:Animals; D021341:Antifreeze Proteins, Type II / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D036441:Osmeriformes; D012997:Solvents
chemical_list: D021341:Antifreeze Proteins, Type II; D012997:Solvents; D002118:Calcium