3SK4

Crystal structure of Staphylococcal nuclease variant Delta+PHS D21N/V23E at cryogenic temperature

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3BDC	PDB ENTRY 3BDC

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	277	25% MPD, 25 mM potassium phosphate, calcium chloride, pdTp, pH 8, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.25	45.31

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.213	α = 90
b = 60.51	β = 94.38
c = 38.626	γ = 90

Symmetry
Space Group	P 1 21 1

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	BRUKER APEX II	multi-layer optics	2010-01-14	M	SINGLE WAVELENGTH

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

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	1.85	60.51	100	0.0323	29	12.5	12309	12309			28.1

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	1.85	1.88	100		0.3387		5.01

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 3BDC	1.85	31.12	12293	12293	586	99.99	0.1766	0.1766	0.1742	0.2275	RANDOM	22.4439

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]
-0.08		0.05	-0.08		0.17

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.318
r_dihedral_angle_3_deg	15.88
r_dihedral_angle_1_deg	6.597
r_dihedral_angle_4_deg	5.097
r_scangle_it	4.856
r_scbond_it	3.299
r_mcangle_it	1.916
r_angle_refined_deg	1.542
r_mcbond_it	1.126
r_chiral_restr	0.122

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.318
r_dihedral_angle_3_deg	15.88
r_dihedral_angle_1_deg	6.597
r_dihedral_angle_4_deg	5.097
r_scangle_it	4.856
r_scbond_it	3.299
r_mcangle_it	1.916
r_angle_refined_deg	1.542
r_mcbond_it	1.126
r_chiral_restr	0.122
r_bond_refined_d	0.016
r_gen_planes_refined	0.013

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1035
Nucleic Acid Atoms
Solvent Atoms	108
Heterogen Atoms	25

Software

Software
Software Name	Purpose
XPREP	data reduction
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
APEX	data collection
APEX	data reduction

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.