1D57

ALTERNATIVE STRUCTURES FOR ALTERNATING POLY(DA-DT) TRACTS: THE STRUCTURE OF THE B-DNA DECAMER C-G-A-T-A-T-A-T-C-G

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.9	277	pH 6.90, VAPOR DIFFUSION, SITTING DROP, temperature 277.00K

Crystal Properties
Matthews coefficient	Solvent content
2.11	41.83

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 38.69	α = 90
b = 39.56	β = 90
c = 33.64	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	273	DIFFRACTOMETER	RIGAKU AFC-5R

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE

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	8				4601	1852		2

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	8	2	1852			0.165

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	404
Solvent Atoms	55
Heterogen Atoms	7

Software

Software
Software Name	Purpose
NUCLSQ	refinement