4.1.1.8 cocrystallization of wild-type OXC with 1 mM CoA, with a precipitating solution containing 0.5 M CaCl2, 0.1 M BisTris propane (2-[bis(2-hydroxyethyl)amino]-2-(hydroxymethyl) propane-1,3-diol), pH 6.5, and 26% polyethylene glycol 550 monomethyl ether 682884 4.1.1.8 ODC alone or in complex with either ADP or acetyl CoA, hanging drop vapor diffusion method, using 100 mM MES/NaOH, pH 6.5 and 1.5 M ammonium sulfate for ODC alone, or 100 mM MES/NaOH, pH 6.25 and 1.75 M ammonium sulfate for ADP–bound ODC, or 100 mM MES/NaOH, pH 6.0, 0.2 M sodium acetate and 5% (w/v) poly(ethylene glycol) 4000 for acetyl CoA-bound ODC 714955 4.1.1.8 recombinant, hanging drop vapour-diffusion method, native and seleno-methionine labelled enzyme is crystallized in two different conditions resulting in two different crystal forms, one showing poor diffraction and the other merohedral twinning. Crystals in the former category belong to the tetragonal space group P4(2)2(1)2, crystals in the latter category are obtained by cocrystallization of the protein with coenzyme A, thiamine diphosphate and Mg2+. The crystal is heavily twinned with a twin ratio of 0.43 664222 4.1.1.8 recombinant, hanging-drop vapour-diffusion method 665685