8U2X

Crystal Structure of NendoU (Uridylate-specific endoribonuclease, nsp15) from Betacoronavirus SARS-CoV-2 (H235A mutant)

X-RAY DIFFRACTION

Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	291	Morpheus Fusion G4: 0.2M Sodium formate; 0.2M Ammonium acetate; 0.2M Sodium citrate tribsic dihydrate; 0.2M Potassium sodium tartrate tetrahydrate; 0.2M Sodium oxamate, 3% w/v NDSB 195, 3% w/v NDSB 201, 3% w/v NDSB 211,3% w/v NDSB 221, 3% w/v NDSB 256, 0.5M Tris (base); 0.5M BICINE pH 8.5, 40% v/v PEG 500 MME; 20 % w/v PEG 20000, BewuA.18928.a.MX152.PW39137 at 18 mg/mL. Plate 13311 well G4 drop2, Puck: PSL-0109, Cryo: Direct

Crystal Properties
Matthews coefficient	Solvent content
4.35	71.73

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 151.372	α = 90
b = 151.372	β = 90
c = 108.745	γ = 120

Symmetry
Space Group	P 63

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 XE 9M		2023-05-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS-II BEAMLINE 19-ID	0.9795	NSLS-II	19-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	2.25	131.09	100	0.182	0.186	0.041	0.999	14.5	21		67209

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	2.25	2.31		100	2.397	2.456	0.533	0.682		21.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	2.25	65.55	1.34	67145	3350	99.95	0.1883	0.187	0.2133

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	13.987
f_angle_d	0.928
f_chiral_restr	0.057
f_bond_d	0.009
f_plane_restr	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5167
Nucleic Acid Atoms
Solvent Atoms	207
Heterogen Atoms	18

Software

Software
Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
XDS	data reduction
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.