3QSF

The first crystal structure of a human telomeric G-quadruplex DNA bound to a metal-containing ligand (a nickel complex)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	293.15	Initial conditions in the 3 ul drop were: 1.25mM quadruplex DNA, 1.25mM ligand, 0.83% PEG (w/v) 10 000, 16.7mM potassium chloride, 16.7mM sodium chloride, 16.7mM lithium sulphate and 20 mM potassium cacodylate buffer at pH 7.0. This was equilibrated against a reservoir well solution of 50% (w/v) PEG 10000 , VAPOR DIFFUSION, HANGING DROP, temperature 293.15K

Crystal Properties
Matthews coefficient	Solvent content
2.7	54.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 44.02	α = 90
b = 54.909	β = 90
c = 33.691	γ = 90

Symmetry
Space Group	C 2 2 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	105	CCD	ADSC QUANTUM 315r		2010-06-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	DIAMOND BEAMLINE I03	1.48660	Diamond	I03

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	2.308	22.01	97.4	0.053	15.1	3.5	1888	1888

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.31	2.43	89.8		0.153	0.153	4.6	2.7	242

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	3QSC	2.4	15	1684	1684	77	97	0.2404	0.2369	0.3203	RANDOM	34.0311

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]
0.73			-0.07		-0.66

RMS Deviations
Key	Refinement Restraint Deviation
r_scangle_it	4.428
r_scbond_it	2.864
r_angle_refined_deg	1.608
r_chiral_restr	0.059
r_gen_planes_refined	0.021
r_bond_refined_d	0.014

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	231
Solvent Atoms	20
Heterogen Atoms	48

Software

Software
Software Name	Purpose
SCALA	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
XDS	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 R01GM133198.