4EQO

Crystal structure of Staphylococcal nuclease variant Delta+PHS V99D at cryogenic temperature

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	277	20% MPD, 25 mM potassium phosphate, calcium chloride, pdTp, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.21	44.38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.106	α = 90
b = 60.503	β = 93.07
c = 38.032	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	PIXEL	DECTRIS PILATUS 6M	Meridionally-bent fused silica mirror with palladium and uncoated stripes vertically-focusing at 6.6:1 demagnification	2011-08-19	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X25	1.10	NSLS	X25

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	1.697	50	99.7	0.052	20.3	6.3	15559	15559

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	1.697	1.73	96		0.178		5.1	762

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	1.697	37.98	15541	15541	778	99.4	0.1892	0.1892	0.1867	0.2343	RANDOM	30.5134

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]
0.03		-0.03	0.04		-0.07

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.665
r_dihedral_angle_3_deg	19.883
r_dihedral_angle_4_deg	17.331
r_dihedral_angle_1_deg	6.288
r_scangle_it	5.04
r_scbond_it	3.52
r_mcangle_it	2.039
r_angle_refined_deg	1.894
r_mcbond_it	1.312
r_chiral_restr	0.188

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.665
r_dihedral_angle_3_deg	19.883
r_dihedral_angle_4_deg	17.331
r_dihedral_angle_1_deg	6.288
r_scangle_it	5.04
r_scbond_it	3.52
r_mcangle_it	2.039
r_angle_refined_deg	1.894
r_mcbond_it	1.312
r_chiral_restr	0.188
r_bond_refined_d	0.02
r_gen_planes_refined	0.011

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1034
Nucleic Acid Atoms
Solvent Atoms	67
Heterogen Atoms	26

Software

Software
Software Name	Purpose
SCALEPACK	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
CBASS	data collection
HKL-2000	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.