| X-RAY DIFFRACTION |
5.2 |
291 |
PrfA was co-crystallized with LL (5 mol excess of the dipeptide). Crystals grew in 5 days after 4 microL of the protein solution (3.5 mg per ml PrfA, 200 mM NaCl, 20 mM NaP buffer, pH 6.5) was mixed with 2 microL of precipitant solution containing 20% PEG-4000, 17% isopropanol, 100 mM Na citrate pH 5.2 and allowed to equilibrate over a 1 ml solution of the precipitant in a Linbro plate. Before data collection, the crystals were transferred to a cryo-protectant solution including 16% glycerol in the precipitant solution. |
