| X-RAY DIFFRACTION |
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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) were mixed in order to prepare seed crystals. Preparations of seed crystals of PKT were performed by utilizing light induced crystallization method which promoted to form initial crystal nucleus by evanescent field arised from light irradiation to gold nano-particle vapored on general polystyrene plate (Fujifilm Wako). 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. |
