X-RAY DIFFRACTION Experimental Data & Validation

X-ray Experimental Help


Crystalization Experiments
Method Vapor Diffusion Hanging Drop
pH 7.2
Temperature 298.0
Details Crystalline DFMO and L-ornithine complexes with human arginase I were prepared by soaking these ligands into pre-formed crystals of the native enzyme, which were prepared by the hanging drop vapor diffusion method at 21 C. Typically, drops containing 3 uL of protein solution [3.5 mg/mL protein, 50 mM bicine (pH 8.5), 2 mM thymine, 100 uM MnCl2] and 3 uL of precipitant solution [0.1 M bis-Tris (pH 6.5), 28% PEG monomethyl ether 2000] were equilibrated over a 1 mL reservoir of precipitant solution. VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 90.39 α = 90
b = 90.39 β = 90
c = 69.42 γ = 120
Space Group P 3


Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
CCD ADSC QUANTUM 315 -- 2008-06-13
Diffraction Radiation
Monochromator Protocol
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline

Data Collection

Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge I (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
1.43 50 99.8 0.067 0.067 -- -- 116771 116771 -- -- --
High Resolution Shell
Resolution (High) Resolution (Low) Percent Possible (All) R Merge I (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All)
1.43 1.53 100.0 0.64 0.64 2.0 -- --


Structure Solution Method Refinement High Resolution Refinement Low Resolution Cut-off Sigma (I) Cut-off Sigma (F) Number of Reflections (All) Number of Reflections (Observed) Number of Reflections (R-Free) Percent Reflections (Observed) R-Factor (All) R-Factor (Observed) R-Work R-Free R-Free Selection Details
FOURIER SYNTHESIS 1.43 50.0 -- -- 111891 111891 5513 -- -- -- 0.147 0.185 throughout
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 20.503
Anisotropic B[1][1] -1.068
Anisotropic B[1][2] -0.75
Anisotropic B[1][3] 0.0
Anisotropic B[2][2] -1.068
Anisotropic B[2][3] 0.0
Anisotropic B[3][3] 2.137
RMS Deviations
Key Refinement Restraint Deviation
c_scbond_it 1.572
c_scangle_it 2.206
c_mcangle_it 1.503
c_mcbond_it 0.966
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 4790
Nucleic Acid Atoms 0
Heterogen Atoms 22
Solvent Atoms 393


Computing Package Purpose
ADSC Quantum Data Collection
HKL-2000 Data Reduction (intensity integration)
SCALEPACK Data Reduction (data scaling)
CNS Structure Solution
CNS Structure Refinement
Software Name Purpose
ADSC version: Quantum data collection
CNS model building
CNS refinement