4R5Q

Crystal structure and nuclease activity of the CRISPR-associated Cas4 protein Pcal_0546 from Pyrobaculum calidifontis containing a [2Fe-2S] cluster

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7	293	3.5M Sodium FORMATE, 0.1M BIS-TRIS PROPANE, pH 7, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.1	60.32

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 117.836	α = 90
b = 117.836	β = 90
c = 89.412	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 315r	MIRRORS	2012-05-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-ID		APS	19-ID

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	2.65	37.26	99.4	0.047	41	10.4		9378		2	33

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	SAD	2.65	37.26	3	9378	9155	651	99.1	0.229	0.228	0.253

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
f_dihedral_angle_d	14.45
f_angle_d	0.632
f_chiral_restr	0.028
f_bond_d	0.01
f_plane_restr	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1711
Nucleic Acid Atoms
Solvent Atoms	21
Heterogen Atoms	5

Software

Software
Software Name	Purpose
SBC-Collect	data collection
HKL-3000	phasing
DM	model building
SHELX	model building
Coot	model building
PHENIX	refinement
HKL-3000	data reduction
HKL-3000	data scaling
DM	phasing
SHELX	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729.