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Crystal structure of SARS-CoV-2 3CL protease in complex with inhibitor IKR-I-45
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 6XMK
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 VAPOR DIFFUSION, SITTING DROP 6 291 20% (w/v) PEG 6000, 100 mM MES pH 6.0, 200 mM sodium chloride
Crystal Properties Matthews coefficient Solvent content 2.05 40.08
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 111.258 α = 90 b = 54.912 β = 101.89 c = 46.795 γ = 90
Symmetry Space Group C 1 2 1
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 x-ray 100 PIXEL DECTRIS EIGER2 XE 9M 2025-11-01 M SINGLE WAVELENGTH
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 SYNCHROTRON NSLS-II BEAMLINE 19-ID 0.97856 NSLS-II 19-ID
Data Collection Overall ID # Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge I (Observed) Rrim I (All) Rpim I (All) CC (Half) Net I Over Average Sigma (I) Redundancy Number Reflections (All) Number Reflections (Observed) Observed Criterion Sigma (F) Observed Criterion Sigma (I) B (Isotropic) From Wilson Plot 1 2.44 49.03 99.9 0.112 0.121 0.046 0.998 12.1 6.8 10405
Highest Resolution Shell ID # Resolution (High) Resolution (Low) Percent Possible (All) Percent Possible (Observed) R Merge I (Observed) Rrim I (All) Rpim I (All) CC (Half) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All) 1 2.44 2.54 99.9 1.326 1.436 0.547 0.651 6.8
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Resolution (High) Resolution (Low) Cut-off Sigma (F) Number Reflections (Observed) Number Reflections (R-Free) Percent Reflections (Observed) R-Factor (Observed) R-Work (Depositor) R-Work (DCC) R-Free (Depositor) R-Free (DCC) Mean Isotropic B X-RAY DIFFRACTION MOLECULAR REPLACEMENT FREE R-VALUE 2.44 49.03 1.35 10398 496 99.73 0.2132 0.2106 0.2133 0.2656 0.2618
Temperature Factor Modeling Anisotropic B[1][1] Anisotropic B[1][2] Anisotropic B[1][3] Anisotropic B[2][2] Anisotropic B[2][3] Anisotropic B[3][3]
RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 13.633 f_angle_d 0.531 f_chiral_restr 0.041 f_plane_restr 0.004 f_bond_d 0.002
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 2304 Nucleic Acid Atoms Solvent Atoms 13 Heterogen Atoms 34
Software Software Software Name Purpose PHENIX refinement Aimless data scaling XDS data reduction PHASER phasing PDB_EXTRACT data extraction