6TXF

Crystal structure of tetrameric human D137N-SAMHD1 (residues 109-626) with XTP, dAMPNPP and Mn

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	6TX0

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6	293	0.1 M Bistris methane-HCl pH 6, 14% (w/v) PEG 3350

Crystal Properties
Matthews coefficient	Solvent content
2.24	45.12

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 104.978	α = 90
b = 104.978	β = 90
c = 195.516	γ = 90

Symmetry
Space Group	P 43 21 2

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 PILATUS3 6M		2017-04-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	DIAMOND BEAMLINE I24	0.97866	Diamond	I24

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	71.59	97.75	0.122	0.126	0.029	0.998	14.5	16.83		51603			37.6

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	2.29	80.13		1.216	1.307	0.463	0.673	1.8	6.84

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	6TX0	2.25	71.51	48696	2568	97.42	0.1974	0.1952	0.2388	RANDOM	47.142

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]
0.17			0.17		-0.34

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	38.701
r_dihedral_angle_4_deg	16.929
r_dihedral_angle_3_deg	15.242
r_dihedral_angle_1_deg	5.942
r_angle_refined_deg	2.095
r_angle_other_deg	1.14
r_chiral_restr	0.122
r_bond_refined_d	0.021
r_gen_planes_refined	0.011
r_gen_planes_other	0.003

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	38.701
r_dihedral_angle_4_deg	16.929
r_dihedral_angle_3_deg	15.242
r_dihedral_angle_1_deg	5.942
r_angle_refined_deg	2.095
r_angle_other_deg	1.14
r_chiral_restr	0.122
r_bond_refined_d	0.021
r_gen_planes_refined	0.011
r_gen_planes_other	0.003
r_bond_other_d	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	7748
Nucleic Acid Atoms
Solvent Atoms	90
Heterogen Atoms	192

Software

Software
Software Name	Purpose
XDS	data reduction
Aimless	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction

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.