Experiment: 352D

THE CRYSTAL STRUCTURE OF A PARALLEL-STRANDED PARALLEL-STRANDED GUANINE TETRAPLEX AT 0.95 ANGSTROM RESOLUTION

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	244D	NDB ENTRY UDF063 (PDB ENTRY 244D)

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.6	278	pH 6.60, VAPOR DIFFUSION, HANGING DROP, temperature 278.00K

Crystal Properties
Matthews coefficient	Solvent content
1.73	28.75

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 28.28	α = 74.31
b = 34.78	β = 77.68
c = 56.23	γ = 89.81

Symmetry
Space Group	P 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					M
2	1	x-ray	100					M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE BW7B		EMBL/DESY, HAMBURG	BW7B
2	SYNCHROTRON	SRS BEAMLINE PX9.5		SRS	PX9.5

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	0.95		88.8				112719

Refinement

Statistics
Diffraction ID	Structure Solution 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 (Depositor)	R-Work (DCC)	R-Free (Depositor)	Mean Isotropic B
X-RAY DIFFRACTION		NDB ENTRY UDF063 (PDB ENTRY 244D)	0.95		112719	112719			0.152		0.2016

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]

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	1907
Solvent Atoms	560
Heterogen Atoms	23

Software

Software
Software Name	Purpose
SHELXL93	refinement
DENZO	data reduction
SHELXL-93	refinement