1P79

Crystal structure of a bulged RNA tetraplex: implications for a novel binding site in RNA tetraplex

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	293	spermine, potassium chloride, MPD, cacodylate, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
1.79	31.15

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 35.014	α = 90
b = 35.014	β = 90
c = 22.257	γ = 90

Symmetry
Space Group	P 4 21 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	ADSC QUANTUM 4		2001-08-20	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 14-BM-D	0.8985	APS	14-BM-D

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	1.1	16.55	95.3	0.037	23	20		5690

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)
	1.1	1.14	71.9		0.088			770

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation 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	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	1.1	16.55	2	5382	308	94.82	0.12733	0.12678	0.13607	RANDOM	6.497

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]
-0.26			-0.26		0.53

RMS Deviations
Key	Refinement Restraint Deviation
r_sphericity_free	8.627
r_sphericity_bonded	2.673
r_angle_other_deg	2.098
r_scangle_it	2.065
r_angle_refined_deg	1.607
r_scbond_it	1.539
r_rigid_bond_restr	0.855
r_symmetry_vdw_refined	0.752
r_nbd_refined	0.412
r_symmetry_vdw_other	0.346
r_nbd_other	0.196
r_chiral_restr	0.123
r_xyhbond_nbd_refined	0.121
r_symmetry_hbond_refined	0.099
r_nbtor_other	0.096
r_gen_planes_refined	0.032
r_bond_refined_d	0.01
r_bond_other_d	0.003
r_dihedral_angle_1_deg
r_dihedral_angle_2_deg
r_gen_planes_other
r_xyhbond_nbd_other
r_symmetry_hbond_other
r_mcbond_it
r_mcangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	162
Solvent Atoms	90
Heterogen Atoms	3

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing