Experiment: 3W1I

Crystal structure of the N-terminal truncated selenocysteine synthase SelA

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	293	120mM Tris-HCl, 11% PEG 4000, 400mM CaCl2, 160mM KCl, 5.0mM NiCl2, 50mM Na2S2O3, 50mM L-serine, 0.2M NaCl, 10mM 2-mercaptoethanol, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 92.825	α = 90
b = 280.936	β = 113.45
c = 97.645	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	90	CCD	ADSC QUANTUM 270	mirrors	2008-03-04	M	SINGLE WAVELENGTH
2	2	x-ray	90	CCD	ADSC QUANTUM 315	mirrors	2008-02-19	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	PHOTON FACTORY BEAMLINE BL-17A	1.07117	Photon Factory	BL-17A
2	SYNCHROTRON	SPRING-8 BEAMLINE BL41XU	0.97917, 0.97947	SPring-8	BL41XU

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	3.192	50	99.5	0.09	0.09	22.4	7.4	75523	75145		-2

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)
1	3.2	3.31	96		0.674	0.674	2.5	6.2	7513

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	3.192	48.941	1.35	75789	75046	3750	99.02	0.1769	0.1738	0.1658	0.2354	0.2272	RANDOM	130.1176

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]
-21.7714		-6.6801	-9.6703		31.4417

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	14.459
f_angle_d	1.22
f_chiral_restr	0.071
f_bond_d	0.009
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	30712
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	7

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
DM	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
HKL-2000	data reduction
HKL-2000	data scaling
autoSHARP	phasing