1O57

CRYSTAL STRUCTURE OF THE PURINE OPERON REPRESSOR OF BACILLUS SUBTILIS

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	293	10mg/mL PurR, 83 mM HEPES, pH 7.0, 5% PEG8000, 450 mM Lithium sulfate, 50 mM ammonium sulfate, 300 mM NaCl, 5mM DTT, VAPOR DIFFUSION, HANGING DROP, temperature 293K, pH 7.00

Crystal Properties
Matthews coefficient	Solvent content
2.8	55.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 65.077	α = 84.75
b = 72.156	β = 84.03
c = 82.967	γ = 67.47

Symmetry
Space Group	P 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	IMAGE PLATE	MARRESEARCH		1997-09-01	M	MAD
2	1		IMAGE PLATE	RIGAKU RAXIS IIC		1997-09-01

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-1	0.9790, 0.9788, 1.5418	ESRF	ID14-1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	20	97.6	0.073	11.1	4.3		66722		2	45.3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2	2.28	96.6		0.194	3.6	1

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	MAD	THROUGHOUT	2.2	20	66365	3335	94.4	0.1	0.188	0.237	RANDOM	52.7

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]
1.35	2.47	-0.65	0.88	0.16	-2.23

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	23.5
c_scangle_it	9.74
c_scbond_it	7.8
c_mcangle_it	6
c_mcbond_it	4.39
c_angle_deg	1.5
c_improper_angle_d	0.93
c_bond_d	0.01
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8383
Nucleic Acid Atoms
Solvent Atoms	568
Heterogen Atoms	181

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MLPHARE	phasing
CNS	refinement