1QCZ

CRYSTAL STRUCTURE OF E. COLI PURE, AN UNUSUAL MUTASE THAT CATALYZES THE CONVERSION OF N5-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE (N5-CAIR) TO 4-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE (CAIR) IN THE PURINE BIOSYNTHETIC PATHWAY


X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Vapor Diffusion Hanging Drop
pH 8
Temperature 291.0
Details PEG400, TRIS.HCL, MAGNESIUM CHLORIDE, pH 8.00, VAPOR DIFFUSION, HANGING DROP, temperature 18K

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 113.04 α = 90
b = 113.04 β = 90
c = 49.41 γ = 90
Symmetry
Space Group I 4 2 2

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 180
Diffraction Detector
Detector Diffraction Type Details Collection Date
CCD ADSC QUANTUM 4 -- 1998-01-01
Diffraction Radiation
Monochromator Protocol
-- SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON CHESS BEAMLINE F1 -- CHESS F1

Data Collection

Overall
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
1.5 20 97.2 0.077 -- -- 7.7 193682 25072 -- 1.0 14.6
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)
1.5 1.58 86.7 0.172 -- -- 3.9 --

Refinement

Statistics
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
MAD 1.5 20.0 1.0 2.0 25065 24987 1252 99.7 0.189 -- 0.186 0.213 RANDOM
High Resolution Shell
Refinement method Shell Resolution (High) Shell Resolution (Low) # of Reflections (Observed) # of Reflections (R-Free) # of Reflections (R-Work) R-Factor (R-Work) R-Factor (R-Free) R-Factor (R-Free Error) Percent Reflections (Observed)
X Ray Diffraction 1.5 1.57 -- 133 2499 0.256 0.262 -- 83.0
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 14.2
RMS Deviations
Key Refinement Restraint Deviation
x_scbond_it 2.15
x_angle_deg 1.23
x_bond_d 0.007
x_improper_angle_d 1.21
x_dihedral_angle_d 22.9
x_mcbond_it 1.36
x_mcangle_it 1.95
x_scangle_it 3.18
Coordinate Error
Parameter Value
Luzzati ESD (Observed) 0.1645
Luzzati ESD (R-Free Set) 0.1882
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 1196
Nucleic Acid Atoms 0
Heterogen Atoms 0
Solvent Atoms 171

Software

Software
Software Name Purpose
SHAKE model building
SnB phasing
X-PLOR refinement version: 3.843
MOSFLM data reduction
CCP4 data scaling version: (SCALA)