mgsshhhhhhhssgrenlyfqghMEGVRWAFSCGTWLPSRAEWLLAVRSIQPEEKERIGQFVFARDAKAAMAGRLMIRKLVAEKLNIPWNHIRLQRTAKGKPVLAKDSSNPYPNFNFNISHQGDYAVLAAEPELQVGIDIMKTSFPGRGSIPEFFHIMKRKFTNKEWETIRSFKDEWTQLDMFYRNWALKESFIKAIGVGLGFELQRLEFDLSPLNLDIGQVYKETRLFLDGEEEKEWAFEESKIDEHHFVAVALRKPDGSRHQDVPSQDDSKPTQRQFTILNFNDLMSSAVPMTPEDPSFWDCFCFTEEIPIRNGTKS
Buffers: Lysis buffer: 50 mM Tris-HCl, pH 7.5, 500 mM NaCl, 10 mM imidazole, 0.5 mM TCEP. Wash buffer: 50 mM Tris-HCl, pH 7.5, 500 mM NaCl, 50 mM imidazole, 0.5 mM TCEP. Elution buffer: 50 mM Tris-HCl, pH 7.5, 500 mM NaCl, 250 mM imidazole, 0.5 mM TCEP.
Procedure: The cell extract was loaded on the column at 0.8 mL/minute on an AKTA-express system (GE/Amersham). The column was then washed with 10 volumes of Lysis buffer, 10 volumes of wash buffer, and then eluted with elution buffer at 0.8 mL/min. The eluted peak of A280 was automatically collected.
Column 2 : Gel filtration, Hiload 16/60 Superdex 200 prep grade 120 mL (GE Healthcare)
Buffers: GF buffer: 10 mM HEPES, pH 7.5, 500 mM NaCl, 5 % glycerol, 0.5 mM TCEP.
Frozen cell pellets were thawed on ice over night and resuspended in a total volume of 40 mL lysis buffer, the cells were disrupted by high pressure (20 psi) followed by sonication.
Nucleic acids and cell debris were removed by adding 0.15% PEI from a 5% (w/v) stock, stirring for 15 minutes, then centrifugation for 20 minutes at 40,000xg. The supernatant was then further clarified by filtration (0.45 µm).
Concentration:
Ligand
MassSpec:
Crystallization:Crystals were obtained using the following conditions: Vapour diffusion method, sitting drop, 293K, 0.05 M H3Cit/Na3Cit, pH 5.7, 14% PEG 3350.
NMR Spectroscopy:
Data Collection:Resolution: 2.2Å, X-ray source: Synchrotron SLS -X10, multiple wavelength.
Data Processing: