Experiment: 2Q1O

Crystal Structure Analysis of the RNA Dodecamer CGC-NF2-AAUUGGCG, with an Incorporated 2,4-Difluorotoluyl Residue (NF2)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		Model of Native A-RNA

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6	291	Droplets containing 0.5 mM oligonucleotide, 0.8 M ammonium sulfate, 0.05 M MES, pH 6.0, were equilibrated against a reservoir of 1.6 M ammonium sulfate, 0.1 M MES, pH 6.0. , VAPOR DIFFUSION, SITTING DROP, temperature 291K

Crystal Properties
Matthews coefficient	Solvent content
2.02	39.18

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 22.9	α = 96.24
b = 32.06	β = 83.87
c = 42.93	γ = 93.91

Symmetry
Space Group	P 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	120	CCD	MARMOSAIC 300 mm CCD		2005-11-16	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 22-ID	0.9199	APS	22-ID

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	1.1	42.45	93.9	0.059		3.4	48767	45791

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.1	1.14	90.7		0.239		2.6	4414

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	Model of Native A-RNA	1.1	10	4	45752	43113	2152	94.2	0.114	0.11	0.108	0.1126	0.142	0.1417	RANDOM

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
s_angle_d	0.029
r_bond_refined_d	0.014

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	1016
Solvent Atoms	324
Heterogen Atoms

Software

Software
Software Name	Purpose
HKL-2000	data collection
EPMR	phasing
SHELXL-97	refinement
HKL-2000	data reduction
HKL-2000	data scaling