2XGD

Crystal structure of a designed homodimeric variant T-A(L)A(L) of the tetracycline repressor

X-RAY DIFFRACTION

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Crystallization

Crystal Properties
Matthews coefficient	Solvent content
2.38	48.32

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.656	α = 90
b = 69.656	β = 90
c = 184.328	γ = 90

Symmetry
Space Group	I 41 2 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	RAYONIX			M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	BESSY BEAMLINE 14.1		BESSY	14.1

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	2.25	40	99.3	0.06	28.2	19.4		11142			58

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	2.25	2.39	96.2		0.69	4.2	14.1

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 1A6I	2.25	34.84	10254	890	100	0.22032	0.21686	0.25886	RANDOM	48.629

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]
1.93			1.93		-3.86

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	38.638
r_dihedral_angle_3_deg	20.376
r_dihedral_angle_4_deg	18.138
r_dihedral_angle_1_deg	7.468
r_scangle_it	1.994
r_angle_refined_deg	1.445
r_scbond_it	1.433
r_angle_other_deg	0.964
r_mcangle_it	0.95
r_mcbond_it	0.784
r_symmetry_hbond_refined	0.288
r_symmetry_vdw_other	0.248
r_nbd_refined	0.225
r_symmetry_vdw_refined	0.218
r_xyhbond_nbd_other	0.194
r_xyhbond_nbd_refined	0.193
r_nbd_other	0.19
r_nbtor_refined	0.174
r_mcbond_other	0.139
r_nbtor_other	0.096
r_chiral_restr	0.085
r_bond_refined_d	0.014
r_gen_planes_refined	0.005
r_bond_other_d	0.002
r_gen_planes_other	0.001
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1550
Nucleic Acid Atoms
Solvent Atoms	55
Heterogen Atoms	1

Software

Software
Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling