| X-RAY DIFFRACTION |
6.0 |
295 |
EcoLigA (0.3 mM) was reacted with 5 mM MgCl2 and 0.3 mM NAD+ for 30 min at 22 C. The ligase-adenylylation reaction was then quenched by adding 10 mM EDTA. The mixture was supplemented with 26-bp nicked duplex DNA (0.318 mM). This LigA-nucleic acid solution was mixed 1:2 with a well solution containing 200 mM ammonium sulfate, 50 mM sodium acetate, 24% PEG-4000. Crystals were grown at 22 C by the sitting drop vapor diffusion method. Crystals appeared after 3 days. The crystals were transferred serially to solutions containing 5% glycerol/24% PEG-4000, 10% glycerol/26% PEG-4000, 15% glycerol/28% PEG-4000, and 20% glycerol/30% PEG-4000 in 100 mM ammonium sulfate, 50 mM sodium acetate, after which they were flash-frozen in liquid nitrogen. , pH 6.0, VAPOR DIFFUSION, SITTING DROP, temperature 295K |
