Experiment: 3NZ7

A bimolecular anti-parallel-stranded Oxytricha nova telomeric quadruplex in complex with a 3,6-disubstituted acridine ligand containing bis-3-fluoropyrrolidine end side chains

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1L1H	PDB entry 1L1H

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	285.15	The 4 ul drop contained 0.75 mM quadruplex DNA, 0.75 mM ligand, 10 % MPD, 12.5 mM magnesium chloride, 12.5 mM spermine.4HCl and 10 mM potassium cacodylate buffer at pH 6.5. This was equilibrated against a reservoir well solution of 600 ul of 30% MPD, VAPOR DIFFUSION, HANGING DROP, temperature 285.15K

Crystal Properties
Matthews coefficient	Solvent content
2.1	41.55

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 55.574	α = 90
b = 42.704	β = 90
c = 26.995	γ = 90

Symmetry
Space Group	P 21 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	105	CCD	ADSC QUANTUM 315		2010-02-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	DIAMOND BEAMLINE I04	0.9702	Diamond	I04

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	1.1	7.952	97.1	0.073	0.073	25.4	9.5	25994	25994	2	2

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)
	1.1	1.16	98.8		0.087	0.087	6.8	5	3792

Refinement

Statistics
Diffraction ID	Structure Solution 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	PDB entry 1L1H	1.1	7.805	0.19	25901	25901	1286	96.95	0.1389	0.1379	0.1338	0.1592	0.1529	Random	11.9351

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]
1.3432			-1.5357		0.1926

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	34.658
f_angle_d	1.96
f_chiral_restr	0.098
f_plane_restr	0.026
f_bond_d	0.015

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	506
Solvent Atoms	188
Heterogen Atoms	40

Software

Software
Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction