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X-RAY DIFFRACTION
Materials and Methods page
1AT5
  •   Crystallization Hide
    Crystallization Experiments
    pH 4.2
    Details CRYSTALS WERE PREPARED AT 277K FROM A SOLUTION CONTAINING 20 MG/ML PROTEIN, 7 MM TRI-N-ACETYLCHITOTRIOSE, 25 MG/ML SODIUM CHLORIDE, AND 100 MM ACETATE BUFFER PH 4.2, BY EQUILIBRATING THE SOLUTION AGAINST A RESERVOIR SOLUTION CONTAINING 50 MG/ML SODIUM CHLORIDE AND 100 MM ACETATE BUFFER PH 4.2.
     
  •   Crystal Data Hide
    Unit Cell
    Length    (Å) Angle    (°)
    a = 78.61 α = 90
    b = 78.61 β = 90
    c = 38.78 γ = 90
     
    Space Group
    Space Group Name:    P 43 21 2
     
     
  •   Diffraction Hide
    Diffraction Experiment
    Diffrn ID 1
    Data Collection Temperature 277
     
    Diffraction Detector
    Detector IMAGE PLATE
    Type RIGAKU
    Details MIRRORS
    Collection Date 1996-05
     
    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) 34.8
    Number Reflections(Observed) 10924
    Percent Possible(Observed) 92.3
    R Merge I(Observed) 0.052
    B(Isotropic) From Wilson Plot 21.1
    Redundancy 5.2
     
    High Resolution Shell Details
    Resolution(High) 1.8
    Resolution(Low) 1.83
    Percent Possible(All) 65.2
     
     
  •   Refinement Hide
    Refinement Statistics
    Structure Solution Method MOLECULAR REPLACEMENT
    reflnsShellList 1.8
    Resolution(Low) 8.0
    Cut-off Sigma(F) 0.0
    Number of Reflections(Observed) 10754
    Number of Reflections(R-Free) 1071
    Percent Reflections(Observed) 92.8
    R-Factor(Observed) 0.182
    R-Work 0.182
    R-Free 0.233
    R-Free Selection Details RANDOM
     
    Temperature Factor Modeling
    Isotropic Thermal Model RESTRAINED
    Mean Isotropic B Value 20.8
     
    Resolution Shells
    Refinement method X-RAY DIFFRACTION
    Shell Resolution(High) 1.8
    Shell Resolution(Low) 1.86
    Number of Reflections(R-Free) 89
    Number of Reflections(R-Work) 668
    R-Factor(R-Work) 0.233
    R-Factor(R-Free) 0.277
    R-Free Error 0.029
    Percent Reflections(Observed) 65.2
     
    RMS Deviations
    Parameter Type Deviation from Ideal
    x_scangle_it 4.61
    x_scbond_it 2.93
    x_mcangle_it 2.44
    x_mcbond_it 1.54
    x_improper_angle_d 1.28
    x_bond_d 0.01
    x_angle_deg 1.35
    x_dihedral_angle_d 23.0
     
    Coordinate Error
    Luzzati ESD(Observed) 0.2
    Luzzati Sigma A(Observed) 0.19
    Luzzati Resolution Cutoff(Low) 5.0
    Luzzati ESD(R-Free Set) 0.24
    Luzzati Sigma A(R-Free Set) 0.2
     
    Number of Non-Hydrogen Atoms Used in Refinement
    Protein Atoms 1000
    Nucleic Acid Atoms 0
    Heterogen Atoms 45
    Solvent Atoms 95
     
     
  •   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