| X-RAY DIFFRACTION |
? |
298 |
Equal amount of 15 mg ml-1 PKT solution (4 mM DTT, 10 mg ml-1 ThDpp) and precipitant solution (50 mM malonate, 12% tacsimate (pH5), 17% PEG3350, 140 mM PEP) were mixed in order to prepare seed crystals. After 16 h, precipitated crystals were homogenized and centrifuged to use supernatant as seed solution. For the purpose of forming micro-sized crystals of PKT, 1176 micro l of protein-precipitant solution mixture as the same components of seed crystals preparation was mixed with 120 micro l of the seed solution in a 1.5 ml tube. After gentle rotation at 25 degree C for 2 h, the supernatant was exchanged to the same precipitant solution. The same buffer exchange was iteratively conducted after 10 h and 16 h. |
