2OST

The structure of a bacterial homing endonuclease : I-Ssp6803I

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	277	15% to 20% MPD, 100 mM MES buffer, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
4.67	73.69

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 143.777	α = 90
b = 143.777	β = 90
c = 319.179	γ = 90

Symmetry
Space Group	I 4 2 2

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 315		2006-06-08	M	SINGLE WAVELENGTH
2	1	x-ray	100	CCD	ADSC QUANTUM 315		2006-08-25	M	SINGLE WAVELENGTH
3	1	x-ray	100	IMAGE PLATE	RIGAKU RAXIS V		2006-05-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	0.979	ALS	5.0.2
2	SYNCHROTRON	ALS BEAMLINE 5.0.2	0.965	ALS	5.0.2
3	ROTATING ANODE	RIGAKU RU200

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
1,2,3	3.1	160.13	94	0.083	10.7	7.6		28899

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)
1,2,3	3.1	3.15	61.4		0.374		7.6	928

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	3.1	160.13	28898	1459	93.96	0.281	0.278	0.328	RANDOM	83.07

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]
3.44			3.44		-6.88

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.079
r_dihedral_angle_3_deg	19.415
r_dihedral_angle_4_deg	14.392
r_dihedral_angle_1_deg	5.497
r_angle_refined_deg	1.889
r_scangle_it	1.158
r_mcangle_it	0.682
r_scbond_it	0.609
r_mcbond_it	0.374
r_nbtor_refined	0.302
r_chiral_restr	0.228
r_nbd_refined	0.194
r_symmetry_vdw_refined	0.148
r_xyhbond_nbd_refined	0.146
r_symmetry_hbond_refined	0.14
r_metal_ion_refined	0.111
r_bond_refined_d	0.007
r_gen_planes_refined	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4540
Nucleic Acid Atoms	1189
Solvent Atoms	16
Heterogen Atoms	2

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SHARP	phasing
DM	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection