REAGENT or RESOURCE	SOURCE	IDENTIFIER
Chemicals and recombinant proteins
Tris	Sigma-Aldrich	Cat#93362
Triton X-100	Sigma-Aldrich	Cat#T9284
Ni-NTA Agarose resin	QIAGEN
PreScission	Genscript	Cat#Z02799
Thrombin Protease	Cytiva	Cat#27-0846-01
Terasaki Plate	Greiner Bio	Cat#654 102
Pact Premier	Molecular Dimensions	Cat#MD1-29
Pure Cotton	Ipek	N/A
Deposited data
Monoclinic structure of Mpro at ambient temperature	This Paper	PDB ID:7CWB
Orthorhombic structure of Mpro at ambient temperature	This Paper	PDB ID:7CWC
Structure of COVID-19 main protease bound to potent broad-spectrum non-covalent inhibitor X77	PDB Database	PDB ID:6W63
Structural Plasticity of the SARS-CoV-2 3CL Mpro Active Site Cavity Revealed by Room Temperature X-ray Crystallography	Kneller et al., 2020	PDB ID:6WQF
THE 1.28A CRYSTAL STRUCTURE OF 3CL MAINPRO OF SARS-COV-2 WITH OXIDIZED C145 (sulfinic acid cysteine)	PDB Database	PDB ID:6XKH
Crystal structure of the free enzyme of the SARS-CoV-2 (2019-nCoV) main protease	Zhang et al., 2020a, 2020b	PDB ID:6Y2E
The crystal structure of COVID-19 main protease in complex with an inhibitor N3	Jin et al., 2020	PDB ID:6LU7
Experimental models: Cell lines
Rosetta 2(DE3)	Sigma-Aldrich	Cat#71400-M
E.coli BL21 (DE3)	Sigma-Aldrich	Cat#69450-M
Recombinant DNA
pET28a(+)_Construct-1	Genscript	N/A
pET28a(+)_Construct-2	Genscript	N/A
Software and algorithms
PSOCAKE	(Damiani et al., 2016)	https://github.com/lcls-psana/psocake
CHEETAH	(Barty et al., 2014)	https://github.com/biochem-fan/cheetah
CrystFEL	(White et al., 2012)	https://github.com/biochem-fan/CrystFEL
CCP4	(Winn et al., 2011)	https://www.ccp4.ac.uk/
Structure Refinement: PHENIX	(Adams et al., 2010)	http://www.phenix-online.org/
Structure Modelling: COOT	(Emsley and Cowtan, 2004)	https://www.ccp4.ac.uk/
PyMOL	Schrödinger, LLC	https://pymol.org/2/
Maestro molecular modeling program	(Madhavi Sastry et al., 2013)	https://www.schrodinger.com/products/maestro
PROPKA	(Bas et al., 2008)	https://pypi.org/project/propka/
R (Bio3D package)	(Grant et al., 2006; Yao and Grant, 2013)	https://www.r-project.org/