2R2V

Sequence Determinants of the Topology of the Lac Repressor Tetrameric Coiled Coil

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4.8	295	0.1M sodium citrate, 5% Jeffamine M-600, 0.05M zinc acetate, pH 4.8, VAPOR DIFFUSION, HANGING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
2.15	42.82

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 51.696	α = 90
b = 51.696	β = 90
c = 99.793	γ = 90

Symmetry
Space Group	P 43

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 4		2006-11-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X4A	0.97912	NSLS	X4A

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	1.9	51.7	99.7	0.061	13.2	5	20545	20545			27.8

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)
	1.9	1.97	99.9		0.484	3.4	5	2048

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 2NRN	1.9	51.71	20545	20545	1054	99.71	0.19347	0.19347	0.19108	0.24028	RANDOM	37.479

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]
0.63			0.63		-1.26

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.662
r_dihedral_angle_3_deg	17.259
r_dihedral_angle_4_deg	13.05
r_dihedral_angle_1_deg	4.309
r_scangle_it	2.664
r_scbond_it	1.699
r_angle_refined_deg	1.088
r_mcangle_it	0.92
r_mcbond_it	0.536
r_nbtor_refined	0.283
r_symmetry_hbond_refined	0.237
r_nbd_refined	0.197
r_symmetry_vdw_refined	0.177
r_xyhbond_nbd_refined	0.161
r_chiral_restr	0.062
r_metal_ion_refined	0.028
r_bond_refined_d	0.009
r_gen_planes_refined	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2045
Nucleic Acid Atoms
Solvent Atoms	99
Heterogen Atoms	66

Software

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