6YB7

SARS-CoV-2 main protease with unliganded active site (2019-nCoV, coronavirus disease 2019, COVID-19).

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	6LU7

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	293	5% PEG 4000, 5% DMSO, 0.1M MES pH 6.5. 0.15 microlitre protein + 0.3 microlitre reservoir + 0.05 microlitre seed stock

Crystal Properties
Matthews coefficient	Solvent content
1.91	35.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 112.429	α = 90
b = 52.798	β = 103.03
c = 44.611	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 PILATUS3 6M		2020-02-24	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	DIAMOND BEAMLINE I04-1	0.91260	Diamond	I04-1

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	1.25	54.77	94.2	0.104	0.109	0.031	0.999	9.3	9.7		66162

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	1.25	1.27	57.4		1.414	1.683	0.898	0.787		1.9

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	6LU7	1.25	54.77	64937	3435	97.08	0.1436	0.1417	0.1803	RANDOM	18.206

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]
0.81		1.17	-1.64		0.27

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.695
r_dihedral_angle_3_deg	11.017
r_dihedral_angle_4_deg	9.519
r_dihedral_angle_1_deg	7.269
r_angle_other_deg	1.412
r_rigid_bond_restr	1.387
r_angle_refined_deg	1.383
r_chiral_restr	0.07
r_bond_refined_d	0.007
r_gen_planes_refined	0.006

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.695
r_dihedral_angle_3_deg	11.017
r_dihedral_angle_4_deg	9.519
r_dihedral_angle_1_deg	7.269
r_angle_other_deg	1.412
r_rigid_bond_restr	1.387
r_angle_refined_deg	1.383
r_chiral_restr	0.07
r_bond_refined_d	0.007
r_gen_planes_refined	0.006
r_gen_planes_other	0.002
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2358
Nucleic Acid Atoms
Solvent Atoms	393
Heterogen Atoms	35

Software

Software
Software Name	Purpose
REFMAC	refinement
Aimless	data scaling
MOLREP	phasing
PDB_EXTRACT	data extraction
DIALS	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.