2XGX

Crystal structure of transcription factor NtcA from Synechococcus elongatus (mercury derivative)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6.5		NTCA PROTEIN WAS AT 4.7 MG/ML IN 50 MM SODIUM CITRATE PH 6.5, 0.5 M NACL, 5 MM MAGNESIUM CHLORIDE, 50 MM ARGININE HYDROCHLORIDE, 50 MM NA L-GLUTAMATE AND 10 MM 2- OXOGLUTARATE (2OG). CRISTALLIZATION SOLUTION: 0.1 M BIS-TRIS PH 6.5, 36 % PEG 400. THEN, SOAKED IN THE SAME SOLUTION CONTAINING ALSO 10MM 2OG AND 2 MM HGCL2.

Crystal Properties
Matthews coefficient	Solvent content
3.25	62.2

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 67.393	α = 90
b = 69.973	β = 90
c = 149.002	γ = 90

Symmetry
Space Group	P 21 21 21

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	ADSC CCD		2009-02-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE BM16		ESRF	BM16

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	2.85	74.5	97.3	0.08	8	6.6		16626		1.9	74.73

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	2.85	3	97.3		0.46	1.9	6.6

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	SAD	THROUGHOUT	NONE	2.85	50	15751	837	97.07	0.21236	0.21067	0.2453	RANDOM	65.129

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]
0.47			0.16		-0.63

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.357
r_dihedral_angle_4_deg	22.863
r_dihedral_angle_3_deg	20.519
r_dihedral_angle_1_deg	6.058
r_scangle_it	1.541
r_angle_refined_deg	1.298
r_scbond_it	0.9
r_angle_other_deg	0.898
r_mcangle_it	0.567
r_mcbond_it	0.289
r_chiral_restr	0.081
r_mcbond_other	0.061
r_bond_refined_d	0.01
r_gen_planes_refined	0.004
r_bond_other_d	0.003
r_gen_planes_other	0.002
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
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	3302
Nucleic Acid Atoms
Solvent Atoms	9
Heterogen Atoms	36

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
SHELX	phasing