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X-RAY DIFFRACTION
Materials and Methods page
1AT6
  •   Crystallization Hide
    Crystallization Experiments
    pH 7.5
    Temperature 277.0
    Details CRYSTALS WERE PREPARED AT 277 K FROM THE DROPLET MIXTURE OF A 20 MG/ML PROTEIN SOLUTION CONTAINING 7 MM TRI-N-ACETYLCHITOTRIOSE (NAG3) AND 50 MM ACETATE BUFFER PH 4.2 WITH EQUAL VOLUME OF A RESERVOIR SOLUTION CONTAINING 2.0 M AMMONIUM FORMATE AND 100 MM N-(2-HYDROXYETHYL)PIPERAZINE-N'-(2-ETHANESULFONIC ACID) (HEPES) BUFFER PH 7.5. PRIOR TO THE DIFFRACTION DATA COLLECTION, THE CRYSTAL WAS SOAKED IN A CRYOPROTECTANT SOLUTION CONTAINING 30 % (W/V) POLYETHYLENE GLYCOL 20,000, 2.2 M AMMONIUM FORMATE, 100 MM HEPES BUFFER PH 7.5, AND 7 MM NAG3 FOR 2 MINUTES AT 277 K.
     
  •   Crystal Data Hide
    Unit Cell
    Length    (Å) Angle    (°)
    a = 76.66 α = 90
    b = 76.66 β = 90
    c = 38.29 γ = 90
     
    Space Group
    Space Group Name:    P 43 21 2
     
     
  •   Diffraction Hide
    Diffraction Experiment
    Diffrn ID 1
    Data Collection Temperature 100
     
    Diffraction Detector
    Detector IMAGE PLATE
    Type RIGAKU
    Details MIRRORS
    Collection Date 1997-03
     
    Diffraction Radiation
    Monochromator NI FILTER
     
    Diffraction Source
    Source ROTATING ANODE
    Type RIGAKU RUH3R
    Wavelength 1.5418
     
     
  •   Refinement Data Hide
    Reflection Details
    Observed Criterion Sigma(I) 0.0
    Resolution(High) 1.8
    Resolution(Low) 34.3
    Number Reflections(Observed) 10515
    Percent Possible(Observed) 95.8
    R Merge I(Observed) 0.049
    B(Isotropic) From Wilson Plot 15.4
    Redundancy 11.0
     
    High Resolution Shell Details
    Resolution(High) 1.8
    Resolution(Low) 1.86
    Percent Possible(All) 64.9
    R Merge I(Observed) 0.147
    Mean I Over Sigma(Observed) 7.1
    Redundancy 5.6
     
     
  •   Refinement Hide
    Refinement Statistics
    Structure Solution Method MOLECULAR REPLACEMENT
    reflnsShellList 1.8
    Resolution(Low) 34.3
    Cut-off Sigma(F) 0.0
    Number of Reflections(Observed) 10515
    Number of Reflections(R-Free) 992
    Percent Reflections(Observed) 95.8
    R-Factor(Observed) 0.184
    R-Work 0.184
    R-Free 0.23
    R-Free Selection Details RANDOM
     
    Temperature Factor Modeling
    Isotropic Thermal Model RESTRAINED
    Mean Isotropic B Value 14.7
     
    Resolution Shells
    Refinement method X-RAY DIFFRACTION
    Shell Resolution(High) 1.8
    Shell Resolution(Low) 1.86
    Number of Reflections(R-Free) 75
    Number of Reflections(R-Work) 673
    R-Factor(R-Work) 0.233
    R-Factor(R-Free) 0.268
    R-Free Error 0.031
    Percent Reflections(Observed) 69.4
     
    RMS Deviations
    Parameter Type Deviation from Ideal
    x_scangle_it 3.21
    x_scbond_it 2.17
    x_mcangle_it 1.9
    x_mcbond_it 1.27
    x_improper_angle_d 1.37
    x_bond_d 0.01
    x_angle_deg 1.29
    x_dihedral_angle_d 23.1
     
    Coordinate Error
    Luzzati ESD(Observed) 0.2
    Luzzati Sigma A(Observed) 0.18
    Luzzati Resolution Cutoff(Low) 5.0
    Luzzati ESD(R-Free Set) 0.23
    Luzzati Sigma A(R-Free Set) 0.18
     
    Number of Non-Hydrogen Atoms Used in Refinement
    Protein Atoms 1001
    Nucleic Acid Atoms 0
    Heterogen Atoms 43
    Solvent Atoms 184
     
     
  •   Software and Computing Hide
    Computing
    Data Reduction (intensity integration) DENZO
    Data Reduction (data scaling) SCALEPACK
    Structure Solution X-PLOR 3.843
    Structure Refinement X-PLOR 3.843
     
    Software
    refinement X-PLOR version: 3.843
    model building X-PLOR version: 3.843
    data reduction SCALEPACK
    data collection DENZO