X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
pH 7.5
Details CRYSTALS WERE GROWN AT 18C USING THE HANGING DROP METHOD WITH 8-13% MONOMETHYL ETHER POLYETHYLENE GLYCOL 2000 OR 5000 AS PRECIPITANT. DROPS WERE BUFFERED WITH 0.1M TRIS/HCL PH 7.5 CONTAINING 5MM CACL2 AND THE PROTEIN CONCENTRATION WAS 30-35MG/ML. CRYSTALS WERE THEN SOAKED IN 10MM ACARBOSE SOLUTION TO OBTAIN THE COMPLEX.

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 52.72 α = 90
b = 78.27 β = 90
c = 238.86 γ = 90
Symmetry
Space Group C 2 2 21

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 293
Diffraction Detector
Detector Diffraction Type Details Collection Date
IMAGE PLATE MARRESEARCH -- 1995-05-15
Diffraction Radiation
Monochromator Protocol
-- SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON EMBL/DESY, HAMBURG BEAMLINE X11 -- EMBL/DESY, Hamburg X11

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
1.93 30 100.0 0.07 -- -- 4.1 -- 38273 -- -- --
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)
1.93 1.96 99.0 0.13 -- 10.0 3.5 --

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 1.93 20.0 -- 0.0 -- 36166 1844 100.0 -- -- 0.13 0.2 RANDOM
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 12.1
RMS Deviations
Key Refinement Restraint Deviation
p_angle_d 0.026
p_mcangle_it 1.791
p_chiral_restr 0.118
p_xyhbond_nbd 0.122
p_plane_restr 0.01
p_bond_d 0.01
p_staggered_tor 14.0
p_singtor_nbd 0.167
p_planar_d 0.026
p_mcbond_it 1.223
p_multtor_nbd 0.195
p_planar_tor 3.5
p_scbond_it 1.697
p_transverse_tor 28.6
p_scangle_it 2.655
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 3900
Nucleic Acid Atoms 0
Heterogen Atoms 113
Solvent Atoms 680

Software

Software
Software Name Purpose
REFMAC refinement
DENZO data reduction
SCALEPACK data scaling
CCP4 phasing