Experiment: 1U3E

DNA binding and cleavage by the HNH homing endonuclease I-HmuI

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		pdb from SAD phase and DM with solvent flipping

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	Hanging drop vapor diffusion	8.75	298	PEG600, pH 8.75, Hanging drop vapor diffusion, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
3.53	60

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 45	α = 90
b = 108.3	β = 90
c = 248.1	γ = 90

Symmetry
Space Group	I 2 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	toroidal focusing mirror	2003-12-10	M	SINGLE WAVELENGTH
2	1	x-ray	100	CCD	ADSC QUANTUM 210	mirrors	2003-12-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	0.9796	ALS	5.0.2
2	SYNCHROTRON	ALS BEAMLINE 5.0.1	1.00	ALS	5.0.1

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	2.9	50	99.4	0.065	23.3	4.5	13440	13360	2	1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1,2	2.9	2.96	97		0.433	0.433	2.4	4	717

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SAD	THROUGHOUT	pdb from SAD phase and DM with solvent flipping	2.92	50	2	1	13440	13360	2174	10	0.22	0.22	0.216	0.2286	0.247	0.2574	random	68.65

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]
6.855			-14.829		7.974

RMS Deviations
Key	Refinement Restraint Deviation
c_angle_deg	1.267
c_bond_d	0.0066

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1393
Nucleic Acid Atoms	1471
Solvent Atoms	31
Heterogen Atoms	41

Software

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