3.5.3.11 crystal structure of Mn2+ -free, Mn2+ -bound, and Mn2+ -1,6-diaminohexane(inhibitor)-bound forms 665590 3.5.3.11 hangimg-drop vapor-diffusion method, crystallized at 297 K using polyethylene glycol 3000 as a precipitant. X-ray diffraction data are collected to 1.8 A from a crystal grown in the presence of Mn2+ and 1,6-hexanediamine. The crystals are orthorhombic, belonging to the space group P2(1)2(1)2(1), with unit-cell parameters a = 81.77 A, b = 131.44 A, c = 168.85 A, alpha = beta = gamma = 90°. A hexameric molecule is likely to be present in the asymmetric unit 663483 3.5.3.11 hanging-drop vapour-diffusion method, agmatinase (residues Ala36-Val352) overexpressed as a fusion with both N- and C-terminal purification tags in Escherichia coli and crystallized in the presence of Mn2+ and 1,6-diaminohexane at 297 K using polyethylene glycol 4000 as a precipitant. X-ray diffraction data are collected at 100 K to 2.49 A from a flash-frozen crystal. The crystals are tetragonal, belonging to space group P4(2), with unit-cell parameters a = b = 114.54 A, c =125.65A, alpha = beta = gamma = 90°. Three monomers are likely to be present in the asymmetric unit, giving a crystal volume per protein weight of 3.66A 663534