3MC0

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

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	298	sodium acetate 1.4 M protein concentration 7.5 mg/ml, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
3.59	65.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 91.185	α = 90
b = 91.185	β = 90
c = 233.401	γ = 120

Symmetry
Space Group	P 31 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	78	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.	2006-08-14	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	1.99	29.9		0.084				68880

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	PDB entry 1jck	2	29.9	68345	3634	93.87	0.1803	0.17873	0.21051	RANDOM	37.153

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]
1.64	0.82		1.64		-2.46

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	39.044
r_dihedral_angle_4_deg	18.259
r_dihedral_angle_3_deg	16.136
r_dihedral_angle_1_deg	7.429
r_scangle_it	6.098
r_scbond_it	3.948
r_mcangle_it	3.028
r_angle_refined_deg	2.419
r_mcbond_it	1.749
r_nbtor_refined	0.306
r_nbd_refined	0.224
r_chiral_restr	0.221
r_symmetry_vdw_refined	0.213
r_xyhbond_nbd_refined	0.162
r_symmetry_hbond_refined	0.104
r_bond_refined_d	0.032
r_gen_planes_refined	0.013
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	5371
Nucleic Acid Atoms
Solvent Atoms	438
Heterogen Atoms	32

Software

Software
Software Name	Purpose
ADSC	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling