3D0M

X-ray structures of the (GUGGUCUGAUGAGGCC) RNA duplex

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	293	1.7 M ammonium sulphate, 50 mM cacodylate buffer, 15 mM magnesium acetate, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.56	51.95

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.653	α = 90
b = 46.653	β = 90
c = 126.397	γ = 120

Symmetry
Space Group	H 3 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	MAR CCD 165 mm		2004-01-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X13	0.8020	EMBL/DESY, HAMBURG	X13

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	20	99.8	0.055	37	10.6	3434	3434			29

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2	2.03	100		0.463	4.7	8.4

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-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	another crystal form (pdb id 3czw)	2	20	3433	3372	61	100	0.295	0.361	RANDOM	60.988

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]
2.93	1.47		2.93		-4.4

RMS Deviations
Key	Refinement Restraint Deviation
r_scangle_it	4.149
r_angle_refined_deg	3.978
r_scbond_it	2.524
r_nbtor_refined	0.313
r_symmetry_vdw_refined	0.239
r_nbd_refined	0.231
r_xyhbond_nbd_refined	0.197
r_chiral_restr	0.186
r_symmetry_hbond_refined	0.166
r_bond_refined_d	0.02
r_gen_planes_refined	0.012
r_bond_other_d
r_angle_other_deg
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_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_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	341
Solvent Atoms	19
Heterogen Atoms	5

Software

Software
Software Name	Purpose
MAR345	data collection
MOLREP	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling