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X-RAY DIFFRACTION
Materials and Methods page
1C2M
  •   Crystallization Hide
    Crystallization Experiments
    pH 4.98
    Details TRYPSIN-BENZAMIDINE, P3(1) 2 1 WERE GROWN BY VAPOR DIFFUSION, AS DESCRIBED FOR P2(1) 2(1) 2(1) (LARGE CELL) (MANGEL, ET AL., BIOCHEMISTRY 29, 8351-8357, 1990) THE CRYSTAL WAS SOAKED FOR 25 DAYS IN 2.11 M ZN+2, 250 MM CL-, PH 4.86 IN THE ABSENCE OF AN INHIBITOR. THIS SOLUTION WAS REPLACED ONCE EVERY DAY OR TWO TO REMOVE BOUND BENZAMIDINE AND TO INCORPORATE ZN+2 AT THE ACTIVE SITE. IT WAS THEN SOAKED IN CHLORIDE-FREE SOLUTION OF 1.02 MGSO4 . 7H2O, 1.62 M ZNSO4 . 7 H2O, 0.50 M ZINC ACETATE DIHYDRATE, PH 4.98 FOR 10 DAYS DURING WHICH THE SOAKING SOLUTION WAS REPLACED ONCE A DAY.
     
  •   Crystal Data Hide
    Unit Cell
    Length    (Å) Angle    (°)
    a = 54.85 α = 90
    b = 54.85 β = 90
    c = 109.23 γ = 120
     
    Space Group
    Space Group Name:    P 31 2 1
     
     
  •   Diffraction Hide
    Diffraction Experiment
    Diffrn ID 1
    Data Collection Temperature 298
     
    Diffraction Detector
    Detector IMAGE PLATE
    Type RIGAKU RAXIS IV++
    Details MSC MIRRORS
    Collection Date 1998-04-05
     
    Diffraction Radiation
    Diffraction Protocol SINGLE WAVELENGTH
     
    Diffraction Source
    Source ROTATING ANODE
    Wavelength 1.5418
     
     
  •   Refinement Data Hide
    Reflection Details
    Observed Criterion Sigma(I) 0.5
    Resolution(High) 1.33
    Resolution(Low) 35.84
    Number Reflections(Observed) 32374
    Percent Possible(Observed) 74.0
    R Merge I(Observed) 0.085
    Redundancy 2.3
     
    High Resolution Shell Details
    Resolution(High) 1.4
    Resolution(Low) 1.46
    Percent Possible(All) 37.4
    R Merge I(Observed) 0.345
    Mean I Over Sigma(Observed) 1.6
     
     
  •   Refinement Hide
    Refinement Statistics
    Structure Solution Method DIFFERENCE FOURIER PLUS REFINEMENT
    reflnsShellList 1.4
    Resolution(Low) 7.5
    Cut-off Sigma(F) 1.7
    Number of Reflections(Observed) 28118
    Number of Reflections(R-Free) 2864
    Percent Reflections(Observed) 74.0
    R-Factor(Observed) 0.195
    R-Work 0.195
    R-Free 0.234
     
    Temperature Factor Modeling
    Data Not Available
     
    Resolution Shells
    Refinement method X-RAY DIFFRACTION
    Shell Resolution(High) 1.4
    Shell Resolution(Low) 1.46
    Number of Reflections(R-Free) 178
    Number of Reflections(R-Work) 1571
    R-Factor(R-Work) 0.413
    R-Factor(R-Free) 0.422
    Percent Reflections(Observed) 37.4
     
    RMS Deviations
    Parameter Type Deviation from Ideal
    x_improper_angle_d 0.52
    x_bond_d 0.018
    x_angle_deg 3.7
    x_dihedral_angle_d 26.2
     
    Number of Non-Hydrogen Atoms Used in Refinement
    Protein Atoms 1629
    Nucleic Acid Atoms 0
    Heterogen Atoms 8
    Solvent Atoms 213
     
     
  •   Software and Computing Hide
    Computing
    Data Reduction (intensity integration) BIOTEX (MSC)
    Data Reduction (data scaling) BIOTEX
    Structure Solution X-PLOR, QUANTA, INSIGHTII
    Structure Refinement X-PLOR 3.1
     
    Software
    refinement X-PLOR version: 3.1
    model building INSIGHTII
    model building QUANTA
    model building X-PLOR
    data reduction BIOTEX version: (MSC)
    data collection BIOTEX version: (MSC)