1Q9A

Crystal structure of the sarcin/ricin domain from E.coli 23S rRNA at 1.04 resolution

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	295	ammonium sulfate, K-MOPS, magnesium chloride, manganese chloride, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
1.91	35.57

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 29.529	α = 90
b = 29.529	β = 90
c = 76.574	γ = 90

Symmetry
Space Group	P 43

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	CUSTOM-MADE		2000-07-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-ID	0.97764	APS	19-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	1.04	40	94.9	0.037	55.3	5.1	31452	29848

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)
	1.04	1.06	82.5		0.446	2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	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	FOURIER SYNTHESIS	1.04	40	29814	2981		0.1477	0.1477	0.1361	0.1774	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
o_angle_d	0.023
o_bond_d	0.007
o_bond_d_na
o_bond_d_prot
o_angle_d_na
o_angle_d_prot
o_angle_deg
o_angle_deg_na
o_angle_deg_prot
o_dihedral_angle_d
o_dihedral_angle_d_na
o_dihedral_angle_d_prot
o_improper_angle_d
o_improper_angle_d_na
o_improper_angle_d_prot
o_mcbond_it
o_mcangle_it
o_scbond_it
o_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	708
Solvent Atoms	179
Heterogen Atoms

Software

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