2G92

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

X-RAY DIFFRACTION

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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, HANGING DROP	5.5	291	Final droplet composition: 0.5 mM oligonucleotide, 5% MPD, 20 mM sodium cacodylate, pH 5.5, 10 mM cobalt hexamine, 20 mM LiCl and 10 mM MgCl2., VAPOR DIFFUSION, HANGING DROP, temperature 291K

Crystal Properties
Matthews coefficient	Solvent content
1.95	36.92

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 28.614	α = 90
b = 28.614	β = 90
c = 63.171	γ = 120

Symmetry
Space Group	P 31

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	MARRESEARCH		2004-11-09	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 5ID-B	0.992	APS	5ID-B

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	1.61	24.8	0.978	0.054			7538	7538

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)
	1.61	1.66	0.969		0.53

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	1.61	24.78	7538	7425	558	98.55	0.199	0.199	0.196	0.22	0.231	0.25	RANDOM	27.11

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]
1.03	0.52		1.03		-1.55

RMS Deviations
Key	Refinement Restraint Deviation
r_scangle_it	5.042
r_scbond_it	4.323
r_angle_refined_deg	2.066
r_angle_other_deg	1.504
r_xyhbond_nbd_other	0.422
r_xyhbond_nbd_refined	0.356
r_symmetry_hbond_refined	0.311
r_nbd_other	0.281
r_nbtor_refined	0.251
r_nbd_refined	0.182
r_symmetry_vdw_other	0.177
r_nbtor_other	0.131
r_chiral_restr	0.092
r_symmetry_vdw_refined	0.086
r_gen_planes_refined	0.019
r_bond_refined_d	0.012
r_bond_other_d	0.001
r_dihedral_angle_1_deg
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_gen_planes_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_it
r_mcbond_other
r_mcangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	506
Solvent Atoms	84
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
X-GEN	data reduction
X-GEN	data scaling
EPMR	phasing