4TRD

Crystal structure of Staphylcoccal nuclease variant Delta+PHS I72K/V74K at pH 9.0 at cryogenic temperature

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	9	277	20% MPD, 25mM potassium phosphate, calcium chloride, pdTp

Crystal Properties
Matthews coefficient	Solvent content
2.18	43.66

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.809	α = 90
b = 60.204	β = 90
c = 73.827	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	110	CCD	APEX II CCD	mirrors	2014-04-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SEALED TUBE	OTHER	1.54

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	1.6	50	100	0.0237	33.96	18.49	19443	19443			19.7

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	1.6	1.62	100		0.1827	5.09	5.73

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	PDB entry 3BDC	1.6	31.47	19388	991	99.97	0.1713	0.17	0.1947	RANDOM	13.591

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]
-0.07			0.22		-0.15

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.975
r_dihedral_angle_3_deg	15.325
r_dihedral_angle_4_deg	13.299
r_dihedral_angle_1_deg	6.879
r_angle_refined_deg	1.863
r_angle_other_deg	1.131
r_chiral_restr	0.112
r_bond_refined_d	0.017
r_gen_planes_refined	0.013
r_gen_planes_other	0.007

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.975
r_dihedral_angle_3_deg	15.325
r_dihedral_angle_4_deg	13.299
r_dihedral_angle_1_deg	6.879
r_angle_refined_deg	1.863
r_angle_other_deg	1.131
r_chiral_restr	0.112
r_bond_refined_d	0.017
r_gen_planes_refined	0.013
r_gen_planes_other	0.007
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1053
Nucleic Acid Atoms
Solvent Atoms	131
Heterogen Atoms	26

Software

Software
Software Name	Purpose
SAINT	data reduction
PDB_EXTRACT	data extraction
PHASER	phasing
REFMAC	refinement

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 R01GM133198.