2CAX

STRUCTURAL BASIS FOR COOPERATIVE BINDING OF RIBBON-HELIX-HELIX REPRESSOR OMEGA TO MUTATED DIRECT DNA HEPTAD REPEATS

X-RAY DIFFRACTION

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Crystallization

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

Crystal Properties
Matthews coefficient	Solvent content
4.03	69.27

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 219.957	α = 90
b = 44.655	β = 109.26
c = 76.136	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		2004-11-07	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	2.9	30	88.6	0.1	12.1	2.6		14144		2.5

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	2.9	2.97	68.8		0.37	2.5	2.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	OTHER	THROUGHOUT	2.9	30	13145	999	88.6	0.21	0.208	0.247	RANDOM	38.67

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]
0.52		3.14	0.13		1.42

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.893
r_dihedral_angle_4_deg	20.856
r_dihedral_angle_3_deg	17.889
r_dihedral_angle_1_deg	6.86
r_scangle_it	1.948
r_angle_refined_deg	1.454
r_scbond_it	1.134
r_mcangle_it	0.844
r_angle_other_deg	0.766
r_mcbond_it	0.747
r_symmetry_hbond_refined	0.225
r_symmetry_vdw_other	0.215
r_nbd_other	0.211
r_nbtor_refined	0.209
r_nbd_refined	0.205
r_symmetry_vdw_refined	0.191
r_xyhbond_nbd_refined	0.174
r_nbtor_other	0.087
r_chiral_restr	0.056
r_bond_refined_d	0.012
r_gen_planes_refined	0.005
r_bond_other_d	0.002
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	1643
Nucleic Acid Atoms	1440
Solvent Atoms	42
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
SCALEPACK	data scaling