6WRZ

Crystal Structure of Nsp16-Nsp10 Heterodimer from SARS-CoV-2 with 7-methyl-GpppA and S-adenosyl-L-homocysteine in the Active Site and Sulfates in the mRNA Binding Groove.

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	6W4H

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	292	Protein: 5.3 mg/ml (nsp10/nsp16 1:1), 0.15M Sodium chloride, 0.01M Tris pH 7.5 , 2mM SAM, 1mM TCEP, 5% Glycerol; Screen: Anions (F3), 0.1M HEPES pH 7.5, 0.9M Sodium phosphate, 0.9M Potassium phosphate; Soak and Cryo: 1mM SAH, 0.5mM GpppA, 2M Lithium sulfate.

Crystal Properties
Matthews coefficient	Solvent content
4.3	71.38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 169.147	α = 90
b = 169.147	β = 90
c = 51.834	γ = 120

Symmetry
Space Group	P 31 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	CCD	MARMOSAIC 300 mm CCD	BE	2020-04-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 21-ID-F	0.97872	APS	21-ID-F

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	2.25	30	99	0.077	0.077	0.083	0.029	0.992	23.4	7.7		40141		-3	45.1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.25	2.29	99.6		0.857	0.857	0.921	0.332	0.79	2.8	7.3

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	6w4h	2.25	29.91	38166	1960	98.98	0.1634	0.162	0.1902	RANDOM	53.482

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]
0.53	0.26		0.53		-1.7

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	27.543
r_dihedral_angle_3_deg	9.393
r_dihedral_angle_4_deg	9.345
r_dihedral_angle_1_deg	3.035
r_angle_refined_deg	1.246
r_angle_other_deg	0.327
r_gen_planes_refined	0.054
r_chiral_restr	0.052
r_gen_planes_other	0.05
r_bond_refined_d	0.005

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	27.543
r_dihedral_angle_3_deg	9.393
r_dihedral_angle_4_deg	9.345
r_dihedral_angle_1_deg	3.035
r_angle_refined_deg	1.246
r_angle_other_deg	0.327
r_gen_planes_refined	0.054
r_chiral_restr	0.052
r_gen_planes_other	0.05
r_bond_refined_d	0.005
r_bond_other_d	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3214
Nucleic Acid Atoms
Solvent Atoms	226
Heterogen Atoms	167

Software

Software
Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-3000	data reduction
HKL-3000	data scaling
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.