title: Crystallization and preliminary characterization of crystals of human protein kinase CK2.
abstract: The heterotetrameric recombinant holoenzyme of human protein kinase CK2 was purified to homogeneity. It degraded spontaneously to a stable and fully active state in which the catalytic subunit was about 5 kDa smaller than the wild type. The degraded enzyme was crystallized using polyethylene glycol 3350 as precipitant. The crystals belong to the hexagonal space group P6(3). They have unit-cell parameters a = b = 176.0, c = 93.6 A and diffract X-rays to at least 3.5 A resolution. The calculated crystal packing parameter is V(M) = 3.22 A(3) Da(-1), suggesting that one CK2 tetramer is contained in the asymmetric unit and that the solvent content of the unit cell is 62%.
authors.affiliation: Universität zu Köln, Institut für Biochemie, Zülpicher Strasse 47, D-50674 Köln, Germany. karsten.niefind@uni-koeln.de
authors.forename: K
authors.initials: K
authors.lastname: Niefind
authors.forename: B
authors.initials: B
authors.lastname: Guerra
authors.forename: I
authors.initials: I
authors.lastname: Ermakowa
authors.forename: O G
authors.initials: OG
authors.lastname: Issinger
mesh_terms: D047390:Casein Kinase II; D018360:Crystallography, X-Ray; D006801:Humans; D010766:Phosphorylation; D011487:Protein Conformation; D017346:Protein Serine-Threonine Kinases / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D011994:Recombinant Proteins; D047390:Casein Kinase II; D017346:Protein Serine-Threonine Kinases