1D26

EFFECT OF A SINGLE 3'-METHYLENE PHOSPHONATE LINKAGE ON THE CONFORMATION OF AN A-DNA OCTAMER DOUBLE HELIX

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICRODIALYSIS	7	277	pH 7.00, MICRODIALYSIS, temperature 277.00K

Crystal Properties
Matthews coefficient	Solvent content
2.37	48.06

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 43.3	α = 90
b = 43.3	β = 90
c = 24.52	γ = 90

Symmetry
Space Group	P 43 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		OSCILLATION CAMERA	ARNDT-WONACOTT

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X31		EMBL/DESY, HAMBURG	X31

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	2.12	6					1303	1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION		2.12	6	3	1197			0.16

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]

RMS Deviations
Key	Refinement Restraint Deviation
n_phos_bond_it	4.81
n_phos_angle_it	4.37
n_sugar_angle_it	3.92
n_sugar_bond_it	3.13
n_multtor_nbd	0.208
n_singtor_nbd	0.132
n_phos_bond_angle_d	0.074
n_chiral_restr	0.072
n_phos_bond_d	0.055
n_sugar_bond_angle_d	0.035
n_plane_restr	0.02
n_sugar_bond_d	0.015
n_bond_d
n_angle_d
n_planar_d
n_hb_or_metal_coord
n_bond_angle_restr
n_dihedral_angle_restr
n_impr_tor
n_xhyhbond_nbd

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	160
Solvent Atoms	29
Heterogen Atoms	1

Software

Software
Software Name	Purpose
NUCLSQ	refinement