1CH0

RNASE T1 VARIANT WITH ALTERED GUANINE BINDING SEGMENT

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.7		HANGING DROP CONTAINING 2.5 MG/ML RNASE T1, 2.5 MG/ML 2GMP, 15% PEG MONOMETHYLETHER 5000, 50 MM TRIS/HCL (PH7.7), 50 MM MGCL2, 50 MM CACL2 AGAINST 30 % PEG MONOMETHYLETHER 5000, 100 MM TRIS/HCL (PH7.7), 100 MM MGCL2, 100 MM CACL2

Crystal Properties
Matthews coefficient	Solvent content
2.31	36

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 39.82	α = 90
b = 48.85	β = 90
c = 158.77	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	298	IMAGE PLATE	MARRESEARCH		1998-08-19	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ELLIOTT GX-21

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	2.3	35.6	97.7	0.115	9.04	3.14		14434			32.8

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)
	2.3	2.38	98.1		0.396	2.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	1RNT	2.3	35.6	14131	812	97.8	0.198	0.241	RANDOM	34.5

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
x_scangle_it	3.678
x_mcangle_it	2.669
x_scbond_it	2.537
x_mcbond_it	1.682
x_angle_deg	1.2
x_bond_d	0.006
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2355
Nucleic Acid Atoms
Solvent Atoms	144
Heterogen Atoms	53

Software

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