| X-RAY DIFFRACTION |
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291 |
The crystals of Saccharomyces cerevisiae AHAS complex were obtained by the hanging drop vapor diffusion method. The catalytic subunit (70.527 kDa, 70 mg/ml) and regulatory subunit (29.625 kDa, 19.8 mg/ml) freshly thawed were mixed together in a ratio of 1:2, giving a solution where the concentration of the RSU was ~ 30% in excess compared to the CSU. The cofactors, inhibitor, and DTT were added to the solution to a final concentration of 2 mM ThDP, 1 mM FAD, 10 mM MgCl2, 1 mM BSM and 5 mM DTT. The crystallization buffer consisted of 0.2 M sodium malonate pH 7 and 20% w/v PEG 3,350. The crystallization drops consisted of equal volumes (1 ul) of well solution and enzyme complex |
