3LX0

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

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	277	38% MPD, 25mM Potassium Phosphate, Calcium Chloride, pdTp, pH 6.0, vapor diffusion, hanging drop, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
1.97	37.48

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 30.745	α = 90
b = 60.379	β = 97.76
c = 34.531	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	ADSC QUANTUM 315		2009-08-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X25	0.97950	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	1.45	27.2	98.3	0.067	16.4	6.7	21820	21820			24

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)
	1.45	1.48	93.4		0.3	6.918	5.8	1013

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	3BDC	1.5	24.45	19778	19778	1966	98.55	0.181	0.183	0.179	0.222	Imported from 3BDC and extended to 1.45 Angstroms	18.868

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]
0.97		0.1	0.34		-1.29

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.362
r_dihedral_angle_3_deg	14.866
r_dihedral_angle_4_deg	10.182
r_dihedral_angle_1_deg	6.46
r_scangle_it	5.395
r_scbond_it	3.443
r_mcangle_it	2.322
r_angle_refined_deg	1.865
r_mcbond_it	1.504
r_chiral_restr	0.138

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.362
r_dihedral_angle_3_deg	14.866
r_dihedral_angle_4_deg	10.182
r_dihedral_angle_1_deg	6.46
r_scangle_it	5.395
r_scbond_it	3.443
r_mcangle_it	2.322
r_angle_refined_deg	1.865
r_mcbond_it	1.504
r_chiral_restr	0.138
r_bond_refined_d	0.019
r_gen_planes_refined	0.015

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1085
Nucleic Acid Atoms
Solvent Atoms	142
Heterogen Atoms	30

Software

Software
Software Name	Purpose
DENZO	data reduction
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 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.