Experiment: 4QG1

Crystal structure of the tetrameric GTP/dATP-bound SAMHD1 (RN206) mutant catalytic core

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	4BZB	PDB ENTRY 4BZB

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	298	0.1 M SPG, pH 6.5, 25% PEG1500, 20% ethylene glycol, VAPOR DIFFUSION, SITTING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.29	46.18

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 87.695	α = 90
b = 146.724	β = 114.76
c = 99.256	γ = 90

Symmetry
Space Group	P 1 21 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 225 mm CCD		2013-11-16	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 22-BM	1.0000	APS	22-BM

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	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	2.2	42.99	99.26	0.074	6.8	3.2	115260	114395	3	3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.2	2.26	99.62		0.505	1.6	3.18

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 4BZB	2.2	42.987	1.34	115260	114395	2000	99.25	0.2152	0.2143	0.2168	0.2643	0.2643	RANDOM	71.938

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]
2.33		-1.54	-2.94		-0.68

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	23.3
f_angle_d	1.146
f_chiral_restr	0.044
f_bond_d	0.006
f_plane_restr	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	15732
Nucleic Acid Atoms
Solvent Atoms	191
Heterogen Atoms	372

Software

Software
Software Name	Purpose
PHENIX	refinement
PHASER	phasing
REFMAC	refinement
d*TREK	data reduction
d*TREK	data scaling
StructureStudio	data collection