X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Vapor Diffusion
pH 8.8
Temperature 293.0
Details NaCl, Bicine, Tris-HCl, alpha-chymotrypsin, pH 8.8, VAPOR DIFFUSION, temperature 293K

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 64.31 α = 90
b = 69.19 β = 90
c = 149.99 γ = 90
Symmetry
Space Group P 21 21 21

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
CCD ADSC QUANTUM 4 -- 2000-11-02
Diffraction Radiation
Monochromator Protocol
Si monochomator MAD
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON NSLS BEAMLINE X9B 0.9791, 0.9789, 0.9686 NSLS X9B

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
2.3 20 97.6 0.048 -- -- 5.7 29499 168715 -- -3.0 50.9
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)
2.3 2.38 99.5 0.32 -- -- -- 2941

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 2.3 20.0 -- 2.0 30417 27024 1343 88.8 -- -- 0.221 0.275 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 2.3 2.38 2070 108 2070 0.315 0.358 -- 69.6
Temperature Factor Modeling
Temperature Factor Value
Isotropic Thermal Model Isotropic
Mean Isotropic B 55.6
RMS Deviations
Key Refinement Restraint Deviation
c_improper_angle_d 0.94
c_angle_deg 1.63
c_scangle_it 4.2
c_scbond_it 3.0
c_dihedral_angle_d 22.5
c_mcbond_it 2.1
c_mcangle_it 3.4
c_bond_d 0.0118
Coordinate Error
Parameter Value
Luzzati ESD (Observed) 0.33
Luzzati Sigma A (Observed) 0.37
Luzzati Resolution Cutoff (Low) 5.0
Luzzati ESD (R-Free Set) 0.41
Luzzati Sigma A (R-Free Set) 0.41
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 3664
Nucleic Acid Atoms 0
Heterogen Atoms 0
Solvent Atoms 204

Software

Software
Software Name Purpose
SOLVE phasing
SnB phasing version: AND PHASES-95
CNS refinement version: 1.0
DENZO data reduction
SCALEPACK data scaling
SHAKE-N-BAKE phasing
PHASES phasing version: V. 95