4KV6

Crystal structure of Staphylococcal nuclease variant Delta+PHS R126Q at cryogenic temperature

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	277	24% MPD, 25 mM potassium phosphate, calcium chloride, pdTp, pH 8, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.21	44.44

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.024	α = 90
b = 60.238	β = 93.16
c = 38.235	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	110	CCD	APEX II CCD	multi-layer optics	2013-04-23	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	1.55	50	100	0.0216	25.61	10.32	20453	20453			26

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	1.55	1.65	100		0.166	5.24	7	3470

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	1.55	32.27	20385	20385	1042	99.75	0.1732	0.1732	0.1715	0.2032	RANDOM	23.0645

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]
-0.82		0.15	-0.74		1.54

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.998
r_dihedral_angle_3_deg	14.264
r_dihedral_angle_4_deg	9.571
r_dihedral_angle_1_deg	6.402
r_mcangle_it	2.07
r_angle_refined_deg	1.863
r_mcbond_it	1.58
r_mcbond_other	1.537
r_angle_other_deg	0.81
r_chiral_restr	0.132

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.998
r_dihedral_angle_3_deg	14.264
r_dihedral_angle_4_deg	9.571
r_dihedral_angle_1_deg	6.402
r_mcangle_it	2.07
r_angle_refined_deg	1.863
r_mcbond_it	1.58
r_mcbond_other	1.537
r_angle_other_deg	0.81
r_chiral_restr	0.132
r_bond_refined_d	0.018
r_gen_planes_refined	0.011
r_bond_other_d	0.004
r_gen_planes_other	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1031
Nucleic Acid Atoms
Solvent Atoms	136
Heterogen Atoms	26

Software

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

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.