3V2T

Crystal structure of Staphylococcal nuclease variant Delta+PHS I92A/V66A at cryogenic temperature

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	277	20% MPD, 25 mM potassium phosphate, calcium chloride, pdTp, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.24	45.14

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.112	α = 90
b = 60.382	β = 94.24
c = 38.473	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	APEX II CCD	Multi-layer optics	2011-01-25	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SEALED TUBE	OTHER	1.5418

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	1.8	25.047	100	0.022	33.6	12.6	13233	13205			25.5

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	1.8	1.89	100		0.156	6.09	4.97	1805

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	1.8	25.047	13205	13205	1306	99.79	0.167	0.167	0.1614	0.2201	RANDOM	21.1204

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]
-0.84		0.55	-1.19		2.12

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.604
r_dihedral_angle_3_deg	15.763
r_dihedral_angle_4_deg	7.65
r_dihedral_angle_1_deg	6.4
r_scangle_it	4.673
r_scbond_it	3.171
r_mcangle_it	1.829
r_angle_refined_deg	1.541
r_mcbond_it	1.231
r_chiral_restr	0.127

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.604
r_dihedral_angle_3_deg	15.763
r_dihedral_angle_4_deg	7.65
r_dihedral_angle_1_deg	6.4
r_scangle_it	4.673
r_scbond_it	3.171
r_mcangle_it	1.829
r_angle_refined_deg	1.541
r_mcbond_it	1.231
r_chiral_restr	0.127
r_bond_refined_d	0.016
r_gen_planes_refined	0.011

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1028
Nucleic Acid Atoms
Solvent Atoms	115
Heterogen Atoms	26

Software

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

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.