2IOC

The crystal structure of TREX1 explains the 3' nucleotide specificity and reveals a polyproline II helix for protein partenring

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	293	22% PEG 3350, 100mM MES, 2mM MnCl2, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 268K

Crystal Properties
Matthews coefficient	Solvent content
2.27	45.8

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 119.7	α = 90
b = 119.7	β = 90
c = 83.3	γ = 120

Symmetry
Space Group	H 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	110	IMAGE PLATE	RIGAKU	mirrors	2006-05-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU	1.54

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	2.1	24.76	100	0.125	7.7	5.62	25964	25938

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)
	2.1	2.23	100		0.348	3.3	5.44	4881

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	R free	2.1	25	25964	25938	1291	99.9	0.198	0.243	random	22.365

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]
-1.438	-2.424		-1.438		2.877

RMS Deviations
Key	Refinement Restraint Deviation
c_angle_deg	1.645
c_bond_d	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3390
Nucleic Acid Atoms
Solvent Atoms	249
Heterogen Atoms	48

Software

Software
Software Name	Purpose
d*TREK	data scaling
PHASER	phasing
CNS	refinement
PDB_EXTRACT	data extraction
CrystalClear	data collection
d*TREK	data reduction

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.