Experiment: 3NAO

A DNA Crystal Designed to Contain Two Molecules per Asymmetric Unit Cell

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	SLOW COOLING	7	293	125 mM magnesium acetate, 50 mM HEPES (pH 7.0) and 10% MPD in a 100 L sitting drop, equilibrated against a 0.5 ml reservoir of 1.4 M ammonium sulphate for two weeks. SLOW COOLING, temperature changed from 363K to 293K.

Crystal Properties
Matthews coefficient	Solvent content
7.67	83.97

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 105.345	α = 90
b = 105.345	β = 90
c = 183.938	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	100					M	SINGLE WAVELENGTH
2	1	x-ray

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X6A	1.1	NSLS	X6A
2	SYNCHROTRON	NSLS BEAMLINE X25	1.0	NSLS	X25

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	5.03	34.12	85.1			3237	3129

Refinement

Statistics
Diffraction ID	Structure Solution Method	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)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	5.03	34.118	0.17	3237	2742	290	84.94	0.1949	0.1907	0.1916	0.2288	0.2298

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]
37.29			37.29		263.2329

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	33.054
f_angle_d	1.26
f_chiral_restr	0.055
f_bond_d	0.005
f_plane_restr	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	1710
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
ADSC	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing