3OWE

Crystal Structure of Staphylococcal Enterotoxin G (SEG) in Complex with a High Affinity Mutant Mouse T-cell Receptor Chain

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	298	0.2 M sodium citrate, 30% iso-propanol and 0.1 M sodium cacodylate, Protein concentration: 3.25 mg/ml in the drop, VAPOR DIFFUSION, HANGING DROP, temperature 298K, pH 6.5

Crystal Properties
Matthews coefficient	Solvent content
4.06	69.69

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 141.205	α = 90
b = 141.205	β = 90
c = 255.751	γ = 90

Symmetry
Space Group	P 43

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray		CCD	ADSC QUANTUM 315	Cryogenically cooled double crystal monochrometer with horizontal focusing sagittal bend second mono crystal with 4:1 magnification ratio and vertically focusing mirror.	2007-03-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X29A	1.1	NSLS	X29A

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	2.6	50	75	0.111				152700	2.046	2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 2AQ3	2.6	50	2	144940	7666	99.69	0.211	0.261	RANDOM	34.069

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]
0.32			0.32		-0.64

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	39.221
r_dihedral_angle_3_deg	20.026
r_dihedral_angle_4_deg	19.595
r_dihedral_angle_1_deg	9.474
r_scangle_it	5.513
r_scbond_it	3.832
r_mcangle_it	2.692
r_angle_refined_deg	2.663
r_mcbond_it	1.653
r_nbtor_refined	0.337
r_symmetry_hbond_refined	0.304
r_symmetry_vdw_refined	0.279
r_nbd_refined	0.268
r_chiral_restr	0.18
r_xyhbond_nbd_refined	0.179
r_bond_refined_d	0.032
r_gen_planes_refined	0.011
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	21499
Nucleic Acid Atoms
Solvent Atoms	181
Heterogen Atoms

Software

Software
Software Name	Purpose
ADSC	data collection
MOLREP	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling