FIGURE 4.
AUC-SV analyses of ligand-induced dimerization of MERS-CoV 3CLpro. A, sedimentation coefficient distribution for varying concentrations of MERS-CoV 3CLpro (4.1 to 23 μm) with sedimentation coefficient values of 2.9S and 3.9S for the monomer and the dimer, respectively. The best fit value for AUC-SV-calculated Kd is 52 ± 5 μm. B, sedimentation coefficient distribution of MERS-CoV 3CLpro (25 μm) in the presence of different stoichiometric ratios of compound 6 (25, 50, and 100 μm). C, sedimentation coefficient distribution of MERS-CoV 3CLpro (25 μm) in the presence of different stoichiometric ratios of compound 10 (25, 50, and 100 μm). A significant shift in the 2.9S peak (monomer) to a 4.1S peak (dimer) is detected upon addition of increasing concentrations of compounds 6 and 10.