6XHO

Covalent complex of SARS-CoV main protease with ethyl (4R)-4-({N-[(4-methoxy-1H-indol-2-yl)carbonyl]-L-leucyl}amino)-5-[(3S)-2-oxopyrrolidin-3-yl]pentanoate

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1UJ1

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION		294	Precipitant: 4.0 %w/v (3.2 uL of stock 50.0 %w/v) PEG 6000;Buffer: 0.1 M (4.0 uL of stock 1.0 M) MES (pH 6.00); Additive: 0.0025 M (0.1 uL of stock 1.0 M) DTT

Crystal Properties
Matthews coefficient	Solvent content
2.35	47.64

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 55.946	α = 90
b = 99.454	β = 108.77
c = 60.037	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	294	PIXEL	DECTRIS EIGER X 9M		2020-05-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 17-ID	1	APS	17-ID

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	1.446	56.844	67	0.047	0.999	11.5	3.4		74170

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	1.446	1.606			0.655

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1UJ1	1.446	56.84	74161	3694	67	0.2123	0.2109	0.2387	RANDOM	25.51

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]
0.2739		0.1535	-0.4891		0.2152

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	15.74
t_omega_torsion	3.91
t_angle_deg	0.99
t_bond_d	0.008
t_dihedral_angle_d
t_gen_planes
t_it
t_chiral_improper_torsion
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4605
Nucleic Acid Atoms
Solvent Atoms	420
Heterogen Atoms	78

Software

Software
Software Name	Purpose
BUSTER	refinement
autoPROC	data scaling
BUSTER	phasing
autoPROC	data reduction

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.