2EA1

Crystal structure of Ribonuclease I from Escherichia coli COMPLEXED WITH GUANYLYL-2(PRIME),5(PRIME)-GUANOSINE

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.1	298	25% PEG 3350, 0.1M MES, 0.1M AMMONIUM ACETATE, 1MM MAGNESIUM CHLORIDE, 10% GLYCEROL, 4MM EDTA, VAPOR DIFFUSION, HANGING DROP, pH 6.10, temperature 298.0K

Crystal Properties
Matthews coefficient	Solvent content
2.15	42.67

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 43.2	α = 90
b = 49.87	β = 96.37
c = 54.52	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	200	IMAGE PLATE	RIGAKU RAXIS IIC		1997-06-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200	1.5418

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	1.8	54.23	85.7	0.077			18458	18428	1	1

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)
	1.8	1.86	36.4		0.182

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	MOLECULAR REPLACEMENT	THROUGHOUT	1.8	54.23	18428	17471	957	85.6	0.231	0.22	0.218	0.257	RANDOM	30.54

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]
2.81		0.26	-1.19		-1.56

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.063
r_dihedral_angle_4_deg	16.549
r_dihedral_angle_3_deg	14.504
r_dihedral_angle_1_deg	5.575
r_scangle_it	4.408
r_scbond_it	3.263
r_mcangle_it	2.096
r_angle_refined_deg	1.932
r_mcbond_it	1.268
r_symmetry_vdw_refined	0.343

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.063
r_dihedral_angle_4_deg	16.549
r_dihedral_angle_3_deg	14.504
r_dihedral_angle_1_deg	5.575
r_scangle_it	4.408
r_scbond_it	3.263
r_mcangle_it	2.096
r_angle_refined_deg	1.932
r_mcbond_it	1.268
r_symmetry_vdw_refined	0.343
r_nbtor_refined	0.308
r_symmetry_hbond_refined	0.292
r_nbd_refined	0.227
r_chiral_restr	0.17
r_xyhbond_nbd_refined	0.157
r_bond_refined_d	0.015
r_gen_planes_refined	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1909
Nucleic Acid Atoms
Solvent Atoms	142
Heterogen Atoms	43

Software

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

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.