1WTD

Crystal structure of type II restrcition endonuclease, EcoO109I DNA-free form

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	293	PEG 4000, potassium chloride, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.7	54

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 175.551	α = 90
b = 175.551	β = 90
c = 44.603	γ = 90

Symmetry
Space Group	I 4

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			M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SPRING-8 BEAMLINE BL38B1	1.0000, 1.0082, 1.0089, 0.9	SPring-8	BL38B1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.4	20	99.1			26765	26765

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.4	2.49	99

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	2.401	20	25421	25421	1343	98.84	0.257	0.257	0.255	0.297	RANDOM	52.495

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]
2.09			2.09		-4.18

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	40.519
r_dihedral_angle_4_deg	20.469
r_dihedral_angle_3_deg	17.626
r_dihedral_angle_1_deg	5.785
r_angle_other_deg	3.845
r_scangle_it	2.643
r_scbond_it	1.686
r_angle_refined_deg	1.426
r_mcangle_it	1.272
r_mcbond_it	0.702
r_xyhbond_nbd_other	0.277
r_nbd_refined	0.211
r_symmetry_vdw_other	0.18
r_nbtor_refined	0.178
r_xyhbond_nbd_refined	0.178
r_symmetry_hbond_refined	0.158
r_nbtor_other	0.115
r_symmetry_vdw_refined	0.105
r_chiral_restr	0.08
r_bond_refined_d	0.014
r_gen_planes_other	0.006
r_gen_planes_refined	0.005
r_bond_other_d
r_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4125
Nucleic Acid Atoms
Solvent Atoms	45
Heterogen Atoms	60

Software

Software
Software Name	Purpose
HKL-2000	data collection
SCALEPACK	data scaling
SOLVE	phasing
REFMAC	refinement
HKL-2000	data reduction