271D

STRUCTURAL STUDIES ON NUCLEIC ACIDS

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.1		pH 7.10

Crystal Properties
Matthews coefficient	Solvent content
2.27	45.75

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 25.427	α = 90
b = 39.744	β = 90
c = 65.255	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	100	IMAGE PLATE	RIGAKU RAXIS IIC		1995-03-29	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	2.02	39.8		0.0704				13706

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	MIR	2.02		4	4473		92.9	0.176

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	11.116
n_phos_angle_it	10.215
n_sugar_angle_it	10.03
n_sugar_bond_it	8.764
n_xhyhbond_nbd	0.388
n_multtor_nbd	0.241
n_singtor_nbd	0.154
n_chiral_restr	0.067
n_phos_bond_angle_d	0.063
n_angle_d	0.053
n_phos_bond_d	0.041
n_plane_restr	0.033
n_bond_d	0.03
n_planar_d
n_hb_or_metal_coord
n_bond_angle_restr
n_dihedral_angle_restr
n_impr_tor
n_sugar_bond_d
n_sugar_bond_angle_d

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	482
Solvent Atoms	125
Heterogen Atoms	1

Software

Software
Software Name	Purpose
NUCLSQ	refinement
RIGAKU	data reduction
RIGAKU	data scaling