4KHV | pdb_00004khv

Crystal structure of Staphylococcal nuclease variant Delta+PHS V23S at cryogenic temperature

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3BDC	PDB ENTRY 3BDC

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	9	277	26% MPD, 25 mM potassium phosphate, calcium chloride, pdTp, pH 9, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.21	44.25

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 31.145	α = 90
b = 60.403	β = 93.68
c = 37.914	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	PIXEL	DECTRIS PILATUS 6M	Meridionally-bent fused silica mirror with palladium and uncoated stripes vertically-focusing at 6.6:1 demagnification	2013-02-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X25	1.10	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	1.6	50	99.7	0.054	11.5	6.4	18541	18541			33.3

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	1.6	1.63	97.4		0.217	7.8	5.3	907

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 (Depositor)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 3BDC	1.6	32.06	18521	18521	947	99.61	0.1713	0.1713	0.1694	0.2067	0.2239	RANDOM	27.9421

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]
-0.26		-0.15	0.23		0.03

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.886
r_dihedral_angle_3_deg	13.058
r_dihedral_angle_4_deg	9.986
r_dihedral_angle_1_deg	6.502
r_angle_refined_deg	1.74
r_angle_other_deg	0.839
r_chiral_restr	0.117
r_bond_refined_d	0.016
r_gen_planes_refined	0.011
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1032
Nucleic Acid Atoms
Solvent Atoms	118
Heterogen Atoms	26

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
HKL-2000	data scaling