1AXR

COOPERATIVITY BETWEEN HYDROGEN-BONDING AND CHARGE-DIPOLE INTERACTIONS IN THE INHIBITION OF BETA-GLYCOSIDASES BY AZOLOPYRIDINES: EVIDENCE FROM A STUDY WITH GLYCOGEN PHOSPHORYLASE B


X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Soak Native Crystals
pH 6.7
Details NATIVE T-STATE GLYCOGEN PHOSPHORYLASE CRYSTALS WERE SOAKED WITH 10 MM BES, 0.1 MM EDTA AND 0.02% SODIUM AZIDE SOLUTION CONTAINING 5 MM TRIAZOLE AND 50 MM SODIUM DIHYDROGEN PHOSPHATE FOR 1 HOUR., pH 6.7, soak native crystals

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 126.72 α = 90
b = 126.72 β = 90
c = 115.59 γ = 90
Symmetry
Space Group P 43 21 2

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
IMAGE PLATE MAR scanner 180 mm plate -- 1997-03
Diffraction Radiation
Monochromator Protocol
-- --
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON ELETTRA BEAMLINE 5.2R -- ELETTRA 5.2R

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 15 89.8 0.097 -- -- 7.1 -- 37906 -- 0.0 --
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)
2.3 2.34 76.1 0.258 -- 2.9 -- --

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
-- 2.3 8.0 -- 2.0 -- 35849 -- 84.9 -- 0.203 0.203 0.276 --
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 25.0
RMS Deviations
Key Refinement Restraint Deviation
x_scbond_it 1.5
x_angle_deg 1.44
x_improper_angle_d 1.5
x_bond_d 0.008
x_dihedral_angle_d 23.0
x_mcbond_it 1.5
x_mcangle_it 2.0
x_scangle_it 2.0
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 6742
Nucleic Acid Atoms 0
Heterogen Atoms 39
Solvent Atoms 500

Software

Computing
Computing Package Purpose
DENZO Data Reduction (intensity integration)
SCALEPACK 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 model building
X-PLOR version: 3.1 refinement