3D4D

Crystal structure of Staphylococcal nuclease variant Delta+PHS Y91E 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	25% MPD, 25 mM Potassium Phosphate, Calcium Chloride, pdTp, pH 8.0, vapor diffusion, hanging drop, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.36	47.95

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.022	α = 90
b = 81.293	β = 90.05
c = 60.385	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	BRUKER APEX II	multi-layer optics	2008-02-06	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)	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	2	60.38	99.9	0.0635	0.0226	38.84	11.3	17596	17583			20.5

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2	2.1			0.0996	0.0594	15.41	4.85	2296

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	2.1	60.38	17570	17554	1781	99.91	0.2423	0.239	0.233	0.29	RANDOM	8.908

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]
-0.01		0.01			0.01

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.225
r_dihedral_angle_3_deg	16.847
r_dihedral_angle_4_deg	11.916
r_dihedral_angle_1_deg	6.15
r_scangle_it	1.837
r_angle_refined_deg	1.316
r_scbond_it	1.198
r_mcangle_it	0.788
r_mcbond_it	0.545
r_nbtor_refined	0.298
r_nbd_refined	0.202
r_symmetry_vdw_refined	0.19
r_xyhbond_nbd_refined	0.147
r_symmetry_hbond_refined	0.147
r_chiral_restr	0.083
r_metal_ion_refined	0.044
r_bond_refined_d	0.009
r_gen_planes_refined	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2060
Nucleic Acid Atoms
Solvent Atoms	183
Heterogen Atoms	52

Software

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