| X-RAY DIFFRACTION |
6 |
293 |
SARS-CoV-2 Mpro was thawed and diluted to 6 mg/mL (using 20 mM HEPES, pH 7.5, 50 mM NaCl). Beta-Lactam 20e was added to the protein solution to a final concentration of 10 mM; the mixture was incubated for 2 h at ambient temperature prior to dispensing plates. The drop composition was 0.15 uL protein ligand solution, 0.3 uL 11 percent v/v PEG 4000, 0.1 M MES, pH 6.5, and 0.05 ,microL Mpro crystal seed stock. The Mpro crystal seed stock was prepared by crushing Mpro crystals with a pipette tip, suspending them in 30% PEG 4000, 5%v/v DMSO, 0.1 M MES pH 6.5, and vortexing for 60 s with approximately 10 glass beads (1.0 mm diameter, BioSpec products). As reservoir solution was used: 11%v/v PEG 4K, 5%v/v DMSO, 0.1 M MES, pH 6.5. Crystals were grown using the sitting drop vapor diffusion method at 20 degree C and appeared within 24 h, reaching full size within 36 h. Crystals were looped after one week. |
