Experiment: 8SK4

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		in-house model

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	298	10mg/ml Covid-19Mpro (25 mM Hepes pH 7.5, 150 mM NaCl, 1 mM EDTA) was inhibited at 10X molar excess and incubated on ice for 1hr, solution was spun down for 10min at 10,000 rpm. Crystals were grown by hanging-drop vapor diffusion method at 18C. by mixing 1:1, 1:2 and 2:1 ratio of protein to well solution. Crystal grew out of well solution composed of 25% w/v Peg 1500, 100 mM MIB buffer pH 7.0, from PACT screen (Nextal Biotechnologies).

Crystal Properties
Matthews coefficient	Solvent content
2.03	39.47

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 114.51	α = 90
b = 53.744	β = 101.53
c = 45.594	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 S 9M		2020-05-13	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 17-ID	1.5418	APS	17-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	56.1	92.2	0.078	0.084	0.031	0.999	15.5	7		17088			39.19

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	2.1	62.1		1.112	1.242	0.542	0.442		5.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	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)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	2	18.77	17064	890	92	0.1959	0.1936	0.19	0.2359	0.23	RANDOM	42.22

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]
0.8579		-0.792	0.6949		-1.5528

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	15.18
t_omega_torsion	3.64
t_angle_deg	0.95
t_bond_d	0.008
t_dihedral_angle_d
t_trig_c_planes
t_gen_planes
t_it
t_nbd
t_improper_torsion

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	15.18
t_omega_torsion	3.64
t_angle_deg	0.95
t_bond_d	0.008
t_dihedral_angle_d
t_trig_c_planes
t_gen_planes
t_it
t_nbd
t_improper_torsion
t_pseud_angle
t_chiral_improper_torsion
t_sum_occupancies
t_utility_distance
t_utility_angle
t_utility_torsion
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2310
Nucleic Acid Atoms
Solvent Atoms	128
Heterogen Atoms	29

Software

Software
Software Name	Purpose
XDS	data reduction
Aimless	data scaling
BUSTER	refinement
PDB_EXTRACT	data extraction
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.