2O7M

The C-terminal loop of the homing endonuclease I-CreI is essential for DNA binding and cleavage. Identification of a novel site for specificity engineering in the I-CreI scaffold

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	293	pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.088	α = 90
b = 69.088	β = 90
c = 93.04	γ = 90

Symmetry
Space Group	P 43

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	SINGLE WAVELENGTH
2	1	x-ray	100	CCD	MARMOSAIC 225 mm CCD			M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-4	0.97	ESRF	ID14-4
2	SYNCHROTRON	SLS BEAMLINE X06SA	1.0	SLS	X06SA

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	2		93.2			25943	25943

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1g9z	2	34.54	25943	1380	93.2	0.18634	0.18379	0.23464	RANDOM	34.251

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]
-0.09			-0.09		0.18

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.442
r_dihedral_angle_4_deg	25.029
r_dihedral_angle_3_deg	16.413
r_scangle_it	6.049
r_dihedral_angle_1_deg	5.743
r_scbond_it	4.091
r_mcangle_it	2.702
r_angle_refined_deg	2.137
r_mcbond_it	1.785
r_nbtor_refined	0.318

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.442
r_dihedral_angle_4_deg	25.029
r_dihedral_angle_3_deg	16.413
r_scangle_it	6.049
r_dihedral_angle_1_deg	5.743
r_scbond_it	4.091
r_mcangle_it	2.702
r_angle_refined_deg	2.137
r_mcbond_it	1.785
r_nbtor_refined	0.318
r_nbd_refined	0.232
r_xyhbond_nbd_refined	0.186
r_symmetry_hbond_refined	0.179
r_chiral_restr	0.172
r_symmetry_vdw_refined	0.165
r_bond_refined_d	0.029
r_gen_planes_refined	0.011

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2484
Nucleic Acid Atoms
Solvent Atoms	262
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.