165D

THE STRUCTURE OF A MISPAIRED RNA DOUBLE HELIX AT 1.6 ANGSTROMS RESOLUTION AND IMPLICATIONS FOR THE PREDICTION OF RNA SECONDARY STRUCTURE

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.3	277	pH 6.30, VAPOR DIFFUSION, SITTING DROP, temperature 277.00K

Crystal Properties
Matthews coefficient	Solvent content
2.13	42.26

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 53.8	α = 90
b = 19.4	β = 109.9
c = 50.14	γ = 90

Symmetry
Space Group	C 1 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray		IMAGE PLATE	MARRESEARCH			M
2	1	x-ray		DIFFRACTOMETER	ENRAF-NONIUS FAST			M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	LURE		LURE
2

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	1.6						6093	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		1.55	10	2	6098			0.18	0.18

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
x_angle_deg	2.1
x_angle_d	0.03
x_bond_d	0.017
x_bond_d_na
x_bond_d_prot
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	389
Solvent Atoms	54
Heterogen Atoms	31

Software

Software
Software Name	Purpose
X-PLOR	refinement