X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Vapor Diffusion Sitting Drop
pH 5.6
Details ALPHA-CHYMOTRYPSIN WAS DISSOLVED IN POTASSIUM BORATE (PH8.6) AND WAS INCUBATED AT 310K FOR 6 HOURS. SOLID AMMONIUM SULFATE WAS ADDED TO THE SOLUTION, AND THE PRECIPITATE FORMED WAS RECOVERED AND RE-DISSOLVED WITH WATER. CRYSTALLIZATION WAS DONE WITH A SITTING-DROP VAPOR-DIFFUSION PROCEDURE, IN WHICH PROTEIN SOLUTION (15MG/ML) CONTAINING 10MM CACODYLATE, 0.75% SATURATED ACETYLTRIMETHYL AMMONIUM AND 45% SATURATED AMMONIUM SULFATE WAS EQUILIBRATED AGAINST 65% SATURATED AMMONIUM SULFATE AT 293K., pH 5.6, vapor diffusion - sitting drop

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 69.52 α = 90
b = 69.52 β = 90
c = 97.81 γ = 90
Symmetry
Space Group P 42 21 2

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 292
Diffraction Detector
Detector Diffraction Type Details Collection Date
IMAGE PLATE RIGAKU RAXIS IIC YALE MIRRORS 1995-10-24
Diffraction Radiation
Monochromator Protocol
NI FILTER --
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
ROTATING ANODE RIGAKU RUH2R -- -- --

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
1.6 69.5 97.8 0.055 -- -- 10.3 -- 31740 -- 1.0 19.0
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)
1.6 1.65 94.7 0.208 -- 3.1 -- --

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
MOLECULAR REPLACEMENT 1.6 5.0 -- 2.0 -- 30329 2496 97.3 -- 0.191 0.191 0.19 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 1.6 1.66 -- 243 2630 0.285 0.263 0.017 93.4
Temperature Factor Modeling
Temperature Factor Value
Isotropic Thermal Model RESTRAINED
Mean Isotropic B 21.2
RMS Deviations
Key Refinement Restraint Deviation
x_scangle_it 2.5
x_scbond_it 2.0
x_mcangle_it 2.0
x_mcbond_it 1.5
x_improper_angle_d 1.26
x_bond_d 0.007
x_angle_deg 1.42
x_dihedral_angle_d 26.6
Coordinate Error
Parameter Value
Luzzati ESD (Observed) 0.2
Luzzati Resolution Cutoff (Low) 5.0
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 1782
Nucleic Acid Atoms 0
Heterogen Atoms 5
Solvent Atoms 127

Software

Computing
Computing Package Purpose
CONTROL Data Reduction (intensity integration)
PROCESS Data Reduction (data scaling)
X-PLOR 3.1 Structure Solution
X-PLOR 3.1 Structure Refinement
Software
Software Name Purpose
X-PLOR version: 3.1 refinement
X-PLOR version: 3.1 model building
PROCESS data reduction
CONTROL data collection