1ECB

ESCHERICHIA COLI GLUTAMINE PHOSPHORIBOSYLPYROPHOSPHATE (PRPP) AMIDOTRANSFERASE COMPLEXED WITH 2 GMP, 1 MG PER SUBUNIT

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6		5 MM GMP, 20 MM MGCL2, 100 MM BIS-TRIS PH 6.0, 10% PEG-3350, 10% 2-PROPANOL

Crystal Properties
Matthews coefficient	Solvent content
2.63	53

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 95.8	α = 90
b = 113.2	β = 90
c = 199.6	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	110	IMAGE PLATE	RIGAKU		1996-03-26	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

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	2.7	30	97.7	0.092	12.7	6		58955		-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)
	2.7	2.8	78.9		0.33	3.5

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	FREE R, THROUGHOUT	PDB ENTRY 1ECF	2.7	15	58559	2976	97.7	0.208	0.208	0.291	RANDOM SELECTION FROM ALL DATA	32

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	22.4
x_scangle_it	2.5
x_mcangle_it	2
x_scbond_it	2
x_angle_deg	1.854
x_mcbond_it	1.5
x_improper_angle_d	1.46
x_bond_d	0.012
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	14904
Nucleic Acid Atoms	192
Solvent Atoms	39
Heterogen Atoms	4

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
HKL	data reduction
HKL	data scaling
SCALEPACK	data scaling
X-PLOR	phasing