2XKO

Crystal structure of the complex of NtcA with its transcriptional co- activator PipX

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.5		NTCA-PIPX COMPLEX WAS 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. CRYSTALLIZATION SOLUTION: 50 MM MES PH 5.5, 1M SODIUM MALONATE 10 MM MANGANESE CHLORIDE, 2% MPD, 5% DMSO.

Crystal Properties
Matthews coefficient	Solvent content
2	43.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 52.02	α = 90
b = 52.02	β = 90
c = 227.73	γ = 90

Symmetry
Space Group	P 41

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 QUANTUM 210r		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	2.25	56.89	98.9	0.08	7.1	6.9		28245		2	36.2

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	2.37	98.9		0.4	2	5.6

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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 2XHK	2.25	25	26813	1420	98.98	0.2157	0.21413	0.24533	RANDOM	35.677

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]
-0.17			-0.17		0.34

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.474
r_dihedral_angle_4_deg	20.187
r_dihedral_angle_3_deg	16.911
r_dihedral_angle_1_deg	6.793
r_scangle_it	2.999
r_scbond_it	1.813
r_angle_refined_deg	1.419
r_mcangle_it	1.171
r_angle_other_deg	0.896
r_mcbond_it	0.617
r_mcbond_other	0.132
r_chiral_restr	0.08
r_bond_refined_d	0.014
r_gen_planes_refined	0.005
r_bond_other_d	0.001
r_gen_planes_other	0.001
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	4744
Nucleic Acid Atoms
Solvent Atoms	100
Heterogen Atoms	20

Software

Software
Software Name	Purpose
REFMAC	refinement
XDS	data reduction
SCALA	data scaling
MOLREP	phasing