2BNW

Structural basis for cooperative binding of Ribbon-Helix-Helix Omega repressor to direct DNA heptad repeats

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7		150 MM NA/KPO4, PH 7.0, 2.4 NA2MALONATE, PH 7.5, 2% AMINOCAPROIC ACID

Crystal Properties
Matthews coefficient	Solvent content
4	69

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 219.426	α = 90
b = 44.631	β = 108.8
c = 75.96	γ = 90

Symmetry
Space Group	C 1 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	100	CCD	MARRESEARCH		2004-10-28	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	2.45	30	97.4	0.06	12.7	3.3		83105		1

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	2.45	2.54	81.7		0.38	3	2.4

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 1IRQ AND 1CMA	2.45	43.44	24191	1044	97.2	0.227	0.226	0.26	RANDOM	45.81

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]
0.88		-1.1	1.44		-3.03

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.31
r_dihedral_angle_4_deg	21.229
r_dihedral_angle_3_deg	17.072
r_dihedral_angle_1_deg	5.761
r_scangle_it	1.426
r_angle_refined_deg	1.385
r_scbond_it	0.882
r_angle_other_deg	0.798
r_mcangle_it	0.663
r_mcbond_it	0.585
r_symmetry_hbond_refined	0.264
r_nbd_refined	0.214
r_nbtor_refined	0.211
r_nbd_other	0.203
r_xyhbond_nbd_refined	0.203
r_symmetry_vdw_other	0.188
r_symmetry_vdw_refined	0.181
r_nbtor_other	0.091
r_chiral_restr	0.053
r_bond_refined_d	0.011
r_gen_planes_refined	0.006
r_bond_other_d	0.003
r_gen_planes_other	0.001
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_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	1634
Nucleic Acid Atoms	1440
Solvent Atoms	79
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing