3ECA

CRYSTAL STRUCTURE OF ESCHERICHIA COLI L-ASPARAGINASE, AN ENZYME USED IN CANCER THERAPY (ELSPAR)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5	293	0.1 M sodium acetate, MPD, PEG3350

Crystal Properties
Matthews coefficient	Solvent content
2.94	58.13

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 76.7	α = 90
b = 96.1	β = 97.1
c = 111.3	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293	AREA DETECTOR	SIEMENS-XENTRONICS		1992-01-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ENRAF-NONIUS FR590	1.542

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	2.4	10	85.3	0.055		5.4

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	Mean Isotropic B
X-RAY DIFFRACTION	MIR	THROUGHOUT	2.4	9.99	53577		85.27	0.111	0.111		25.809

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]
0.16		-0.34	0.08		-0.15

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	41.044
r_dihedral_angle_4_deg	18.396
r_dihedral_angle_3_deg	16.853
r_dihedral_angle_1_deg	7.317
r_angle_refined_deg	2.013
r_angle_other_deg	1.453
r_chiral_restr	0.09
r_bond_refined_d	0.016
r_gen_planes_refined	0.011
r_gen_planes_other	0.002

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	41.044
r_dihedral_angle_4_deg	18.396
r_dihedral_angle_3_deg	16.853
r_dihedral_angle_1_deg	7.317
r_angle_refined_deg	2.013
r_angle_other_deg	1.453
r_chiral_restr	0.09
r_bond_refined_d	0.016
r_gen_planes_refined	0.011
r_gen_planes_other	0.002
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	9724
Nucleic Acid Atoms
Solvent Atoms	465
Heterogen Atoms	36

Software

Software
Software Name	Purpose
REFMAC	refinement
X-PLOR	model building
X-PLOR	phasing
d*TREK	data reduction
d*TREK	data scaling

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.