7BB2

Crystal structure of the main protease (3CLpro/Mpro) of SARS-CoV-2 at 1.6A resolution (spacegroup P2(1)2(1)2(1))

X-RAY DIFFRACTION

Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	293	0.1M D-Glucose, 0.1M D-Mannose, 0.1M D-Galactose, 0.1M L-Fucose, 0.1M D-Xylose, 0.1M N-Acetyl-D-Glucosamine, 0.1 M Imidazole/MES monohydrate (acid) pH 6.5, 20% v/v Ethylene glycol, 10 % w/v PEG 8000

Crystal Properties
Matthews coefficient	Solvent content
2.59	52.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 67.517	α = 90
b = 100.028	β = 90
c = 103.753	γ = 90

Symmetry
Space Group	P 21 21 21

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 PILATUS 6M		2020-11-25	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 11.2C	0.9716	ELETTRA	11.2C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	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	1.6	103.75	100	0.096	0.999	15.2	12.7		93301			22.31

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.6	1.63			0.615

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	7ALH	1.6	55.96	1.34	93191	4635	99.97	0.1654	0.1642	0.1886	31.96

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	19.4985
f_angle_d	0.9733
f_chiral_restr	0.0514
f_bond_d	0.0072
f_plane_restr	0.0064

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4697
Nucleic Acid Atoms
Solvent Atoms	588
Heterogen Atoms	58

Software

Software
Software Name	Purpose
PHENIX	refinement
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
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.