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crystallization papers
The BRCT domain from Rhp9 (a Schizosaccharomyces pombe DNA-damage checkpoint protein) has been expressed, purified and crystallized. Overexpression in bacterial cells was achieved by minimizing aeration during host cell growth. A robotic screen was used to determine the solubility parameters; concentration of the protein was achieved by exploiting this information. Single crystals suitable for X-ray analysis were obtained in two forms by vapour diffusion (trigonal, unit-cell parameters a = b = 228.04, c = 70.42 Å, and tetragonal, P4/m Laue group symmetry, unit-cell parameters a = b = 72.3, c = 91.1 Å).