2RBM

Crystal structure of Staphylococcal nuclease variant Delta+PHS I72K 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	33% MPD, 25 mM Potassium Phosphate, Calcium Chloride, pdTp, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.19	43.92

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 32.229	α = 90
b = 60.603	β = 90
c = 72.579	γ = 90

Symmetry
Space Group	P 21 21 21

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	2007-08-06	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 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	1.9	46.52	99.99	0.0595	37.25	18.9		11779

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.9	2	100		0.3135	6.13	8.75

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1TQO.PDB where all waters removed, all Bs=20.0 A^2, and I72A, and E92A	1.9	46.52	11725	10580	1144	99.9	0.17981	0.17349	0.23795	RANDOM	16.482

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]

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.749
r_dihedral_angle_1_deg	17.144
r_dihedral_angle_3_deg	16.922
r_dihedral_angle_4_deg	16.491
r_scangle_it	4.141
r_scbond_it	2.749
r_angle_refined_deg	1.95
r_mcangle_it	1.604
r_mcbond_it	1.022
r_nbtor_refined	0.314
r_symmetry_vdw_refined	0.247
r_nbd_refined	0.242
r_symmetry_hbond_refined	0.207
r_xyhbond_nbd_refined	0.166
r_chiral_restr	0.142
r_bond_refined_d	0.016
r_gen_planes_refined	0.007
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1054
Nucleic Acid Atoms
Solvent Atoms	129
Heterogen Atoms	31

Software

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