7AXO

Structure of SARS-CoV-2 Main Protease bound to AR-42.

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	PETRA III, EMBL c/o DESY BEAMLINE P14 (MX2)
Synchrotron site	PETRA III, EMBL c/o DESY
Beamline	P14 (MX2)
Temperature [K]	100
Detector technology	PIXEL
Collection date	2020-04-28
Detector	DECTRIS PILATUS 6M
Wavelength(s)	0.976
Spacegroup name	C 1 2 1
Unit cell lengths	113.562, 53.182, 44.896
Unit cell angles	90.00, 102.93, 90.00

Refinement procedure

Resolution	38.810 - 1.650
R-factor	0.1691
Rwork	0.168
R-free	0.20050
Structure solution method	MOLECULAR REPLACEMENT
Starting model (for MR)	6yb7
RMSD bond length	0.005
RMSD bond angle	0.770
Data reduction software	XDS
Data scaling software	STARANISO
Phasing software	PHASER
Refinement software	PHENIX (1.18-3855_9999)

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	38.810	1.709
High resolution limit [Å]	1.650	1.650
Number of reflections	28362	1266
<I/σ(I)>	11.82
Completeness [%]	87.8
Redundancy	2
CC(1/2)	0.998	0.528

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	COUNTER-DIFFUSION	7.5	291	Co-crystallization with the compounds was achieved by equlibrating a 6.25 mg/ml protein solution in 20 mM HEPES buffer (pH 7.8) containing 1 mM DTT, 1mM EDTA, and 150 mM NaCl against a reservoir solution of 100 mM MIB buffer (2:3:3 molar ratio of malonic acid, imidazole, and boric acid), pH 7.5, containing 25% v/v PEG 1500 and 5% v/v DMSO. Prior to crystallization compound solutions in DMSO were dried onto the wells of SwissCI 96-well plates. To achieve reproducible crystal growth seeding was used. Crystals appeared within a few hours and reached their final size after 2 -3 days.