title: Crystallization and preliminary X-ray crystallographic studies of a macromolecular antitumour antibiotic, C1027.
abstract: C1027 is a macromolecular antitumour antibiotic produced by Streptomyces globispourus C1027 and consists of an apoprotein and a non-protein labile chromophore. Little is known about how the thermally unstable chromophore is stabilized by the apoprotein. The purified C1027 was monodisperse according to dynamic light-scattering measurements and crystallized in two different crystal forms from two different starting conditions using the vapour-diffusion method. Condition I yielded hexagonal prism crystals having space group P3(1)/P3(2) and unit-cell parameters a = b = 66.8, c = 55.4 A. Diffraction data were collected to 2.1 A resolution using an in-house Rigaku rotating Cu anode X-ray generator. Another condition produced rod-like crystals with space group P3(1)21/P3(2)21 and unit-cell parameters a = b = 55.15, c = 55.87 A. A data set to 1.8 A resolution was collected from a rod-like crystal using a MAR CCD detector at the SRS synchrotron source.
authors.affiliation: Laboratory of Structural Biology and MOE Laboratory of Protein Science, School of Life Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: R
authors.initials: R
authors.lastname: Shao
authors.forename: M
authors.initials: M
authors.lastname: Bartlam
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: L
authors.initials: L
authors.lastname: Jin
authors.forename: Y
authors.initials: Y
authors.lastname: Gao
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Tang
authors.forename: Y
authors.initials: Y
authors.lastname: Zhen
authors.forename: Z
authors.initials: Z
authors.lastname: Rao
mesh_terms: D000617:Aminoglycosides; D000900:Anti-Bacterial Agents / Q000737:chemistry*; D000903:Antibiotics, Antineoplastic / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D053281:Enediynes; D015394:Molecular Structure
chemical_list: D000617:Aminoglycosides; D000900:Anti-Bacterial Agents; D000903:Antibiotics, Antineoplastic; D053281:Enediynes; C058024:C 1027