1DUH

CRYSTAL STRUCTURE OF THE CONSERVED DOMAIN IV OF E. COLI 4.5S RNA

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6	303.15	CRYSTALLIZED FROM 1.60-1.90 M (NH4)2SO4, 0.09 M MAGNESIUM ACETATE, 0.05 M SODIUM CACODYLATE PH 6.0, AT 303 K. CRYSTALS WERE STABILISED AT 292 K IN A SOLUTION OF 2.20 M (NH4)2SO4, 0.01 M MGCL2, 0.05 M BIS-TRIS-HCL PH 6.0. SOAK CONDITIONS: CRYSTALS WERE SOAKED IN STABILISATION SOLUTION CONTAINING 0.002 M LUTETIUM CHLORIDE HEXAHYDRATE. CRYOPROTECTION CONDITIONS: AFTER ADDITION OF 20% GLYCEROL (W/V) TO THE SOAK SOLUTION, CRYSTALS WERE FLASH-FROZEN IN LIQUID NITROGEN., VAPOR DIFFUSION, SITTING DROP, temperature 303.15K

Crystal Properties
Matthews coefficient	Solvent content
4.15	76.9

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.697	α = 90
b = 69.697	β = 90
c = 84.102	γ = 120

Symmetry
Space Group	P 32 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	100	IMAGE PLATE	MARRESEARCH		1999-08-01	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 5.2R	1.0302, 1.3366, 1.3369, 0.9968, 1.3359	ELETTRA	5.2R

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	2.7	22.5	98.5	0.076	14.5	4.2	12371	12371			100.3

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)
	2.7	2.8	100		0.593	2.1	4.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	2.7	22.5	12560	10539	909	83.9	0.271	0.244	0.23	0.245	RANDOM	80.6

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]
26.51	21.46		26.51		-53.03

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	15.6
c_improper_angle_d	1.24
c_angle_deg	1
c_bond_d	0.006
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot
c_mcbond_it
c_mcangle_it
c_scbond_it
c_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	970
Solvent Atoms	6
Heterogen Atoms	12

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing