7NBT

Crystal Structure of SARS-CoV-2 main protease (Nsp5) in complex with compound 21

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	7B2J

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.75	293	100 nL protein (8.3 mg/mL, 50 mM Tris pH 8.0, 300 mM NaCl), 50 nL seeds, 450 nL reservoir (200 mM HEPES pH 7.75, 5% DMSO, 12.5% PEG4K). Soaking: 200 mM HEPES pH 7.75, 12.5 mM compound, 5% DMSO, 10% PEG300, 20% PEG3K, RT, 2 h.

Crystal Properties
Matthews coefficient	Solvent content
1.99	38.29

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 114.582	α = 90
b = 53.77	β = 100.526
c = 44.524	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 EIGER X 16M		2020-12-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	MAX IV BEAMLINE BioMAX	0.97625	MAX IV	BioMAX

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	1.63	56.33	98.1	0.06	0.074	0.043	0.998	11.1	5.1		32705

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	1.63	1.66			0.747	0.932	0.55	0.774	2	5.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	7B2J	1.63	43.813	32700	1621	98.027	0.192	0.1904	0.2302	Random selection	29.495

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]
3.13		0.059	-1.231		-1.797

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.217
r_dihedral_angle_3_deg	14.156
r_dihedral_angle_4_deg	9.985
r_dihedral_angle_1_deg	7.127
r_lrange_it	6.49
r_scangle_it	5.093
r_scbond_it	3.67
r_mcangle_it	3.224
r_mcbond_it	2.421
r_angle_refined_deg	1.552

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.217
r_dihedral_angle_3_deg	14.156
r_dihedral_angle_4_deg	9.985
r_dihedral_angle_1_deg	7.127
r_lrange_it	6.49
r_scangle_it	5.093
r_scbond_it	3.67
r_mcangle_it	3.224
r_mcbond_it	2.421
r_angle_refined_deg	1.552
r_nbtor_refined	0.321
r_nbd_refined	0.212
r_symmetry_nbd_refined	0.209
r_xyhbond_nbd_refined	0.159
r_symmetry_xyhbond_nbd_refined	0.125
r_chiral_restr	0.107
r_gen_planes_refined	0.01
r_bond_refined_d	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2358
Nucleic Acid Atoms
Solvent Atoms	149
Heterogen Atoms	34

Software

Software
Software Name	Purpose
REFMAC	refinement
Aimless	data scaling
XDS	data reduction
PHASER	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.