| X-RAY DIFFRACTION |
8 |
293.5 |
Buffer (10mM Tris/HCl pH 8.0, 150 mM NaCl, 10 mm lactose and 1 mM TCEP) mixed with reservoir 25% (w/v) PEG 2000 monomethylethyer (MME), a cryo solution (10 mM Tris/HCl pH 8.0, 50 mM NaCl, 10 mM lactose, 25% (w/v) PEG 2000 MME, 20% ethylene glycol (EG) and 1 mM TCEP) and flash-frozen in liquid nitrogen.
A co-crystal with lactose, grown from a seeded drop with 24% (w/v) PEG 2000 MME in the reservoir, was used to soak in compound 1 by transferring crystals in three steps to different soaking drops. First to a 2 ul drop with glycerol ( 20% (v/v) glycerol, 25% (w/v PEG 2000 MME, 10 mM Tris/HCl pH 8.0, 50 mM NaCl and 1 mM TCEP) and secondly to a 2 ul drop with 10 mM compound 1 (10 mM Tris/HCl pH 8.0, 50 mM NaCl, 5 mM compound 1, 25% (w/v) PEG 2000 MME and 1 mM TCEP) and thirdly to a second drop with 5 mM compound 1 (same composition as before). |
