| X-RAY DIFFRACTION |
5.5 |
291 |
Protein and duplex DNA were incubated together at a ratio of 1:1.3 (PrfA dimer:hly DNA) at final concentrations of 50 microM and 70 microM respectively in 20 mM Tris-HCl pH 8.0, 150 mM NaCl, 1 mM DTT for 60 min at room temperature, before being used for crystal setups. Crystals were obtained after 24 h by mixing 4 microL protein-DNA solution with 2 microL reservoir solution consisting of 8% PEG 8000, 100 mM sodium acetate pH 4.6, 100 mM magnesium acetate, 20% glycerol. Prior to vitrification the soaking of PrfAWT-DNA crystals were soaked in a reservoir solution containing 30% glycerol for 24 h. |
