1ZT9

E. coli trp repressor, tetragonal crystal form

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.6	294	2.8 M ammonium sulfate plus 50 mM sodium, potassium phosphate buffer, 5 mM L-tryptophan, VAPOR DIFFUSION, HANGING DROP, temperature 294K, pH 5.60

Crystal Properties
Matthews coefficient	Solvent content
3.1	60.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 81.348	α = 90
b = 81.348	β = 90
c = 72.687	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	MIRRORS	2003-10-19	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X26C		NSLS	X26C

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	50	99.1	0.063		4.3		31825		-3

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)
	2	2.07			0.169		3.2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	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 2WRP, BIOLOGICAL UNIT	2	30	-3	30461	30166	1636	99	0.167	0.164	0.219	RANDOM	19.83

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]
0.08			0.08		-0.17

RMS Deviations
Key	Refinement Restraint Deviation
r_scangle_it	6.149
r_dihedral_angle_1_deg	4.673
r_scbond_it	4.331
r_mcangle_it	4.283
r_mcbond_it	2.948
r_angle_refined_deg	1.203
r_angle_other_deg	0.802
r_nbd_other	0.236
r_symmetry_vdw_other	0.23
r_symmetry_vdw_refined	0.212
r_nbd_refined	0.208
r_symmetry_hbond_refined	0.173
r_xyhbond_nbd_refined	0.164
r_nbtor_other	0.08
r_chiral_restr	0.069
r_bond_refined_d	0.013
r_gen_planes_refined	0.006
r_gen_planes_other	0.004
r_bond_other_d	0.002
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_nbtor_refined
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_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3248
Nucleic Acid Atoms
Solvent Atoms	558
Heterogen Atoms	100

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
CBASS	data collection