3HEJ

Crystal structure of Staphylococcal nuclease variant Delta+PHS T62R at cryogenic temperature

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	277	24% MPD, 25 mM Potassium Phosphate, Calcium Chloride, 5% Glycerol, pdTp, pH 8.0, vapor diffusion, hanging drop, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.64	53.38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 67.598	α = 90
b = 74.42	β = 90.22
c = 67.975	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	Meridionally-bent fused silica mirror with palladium and uncoated stripes	2008-10-28	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)	R Sym 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	68.04	99.3	0.056	0.046	22.9	9.4	62888	62385			34.3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.8	1.86	99.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	1.8	50	62385	62385	3162	99.64	0.207	0.207	0.205	0.244	RANDOM	26.557

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]
1.36		-0.42	-0.48		-0.88

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.287
r_dihedral_angle_4_deg	16.02
r_dihedral_angle_3_deg	15.359
r_scangle_it	6.585
r_dihedral_angle_1_deg	5.807
r_scbond_it	4.594
r_mcangle_it	2.763
r_mcbond_it	1.787
r_angle_refined_deg	1.239
r_chiral_restr	0.112
r_gen_planes_refined	0.016
r_bond_refined_d	0.01

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4320
Nucleic Acid Atoms
Solvent Atoms	478
Heterogen Atoms	128

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 scaling