X-RAY DIFFRACTION Experimental Data & Validation


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Crystallization

Crystalization Experiments
pH 8
Details CRYSTALS OF TRYPSIN WERE GROWN IN 2.5M AMMONIUM SULPHATE, 6MM CALCIUM CHLORIDE, 0.1M TRIS PH 8.15, 60MM BENZAMIDINE. THEY WERE BACKSOAKED IN 0.1M NA PHOSPHATE PH 5.8, 2.5M AMMONIUM SULPHATE TO REMOVE BENZAMIDINE. CRYSTALS WERE MOVED TO 2.5M AMMONIUM SULPHATE, 1MM CALCIUM CHLORDIE, 0.1M TRIS PH 8 AND PEPTIDE INHIBITOR ADDED AT 10MM AND INCUBATED FOR 16 HOURS.

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 60.66 α = 90
b = 63.93 β = 90
c = 71.7 γ = 90
Symmetry
Space Group P 21 21 21

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
CCD (QUANTUM 4) ADSC MIRROR 2003-10-05
Diffraction Radiation
Monochromator Protocol
SI (111) SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON SRS BEAMLINE PX14.1 -- SRS PX14.1

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
2.25 47.73 97.5 0.12 -- -- 4.2 -- 13342 -- 1.4 --
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)
2.25 2.33 84.9 0.59 -- 1.4 3.6 --

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 2.25 47.73 -- -- -- 12681 661 96.9 -- 0.196 0.194 0.253 RANDOM
High Resolution Shell
Refinement method Shell Resolution (High) Shell Resolution (Low) # of Reflections (Observed) # of Reflections (R-Free) # of Reflections (R-Work) R-Factor (R-Work) R-Factor (R-Free) R-Factor (R-Free Error) Percent Reflections (Observed)
X Ray Diffraction 2.25 2.31 -- 32 716 0.281 0.352 -- --
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 73.66
Anisotropic B[1][1] 3.66
Anisotropic B[1][2] 0.0
Anisotropic B[1][3] 0.0
Anisotropic B[2][2] -2.78
Anisotropic B[2][3] 0.0
Anisotropic B[3][3] -0.88
RMS Deviations
Key Refinement Restraint Deviation
r_scangle_it 3.316
r_scbond_it 2.481
r_mcangle_it 1.555
r_mcbond_it 0.93
r_nbd_refined 0.239
r_gen_planes_refined 0.007
r_chiral_restr 0.13
r_dihedral_angle_4_deg 21.147
r_dihedral_angle_3_deg 15.568
r_dihedral_angle_2_deg 41.14
r_dihedral_angle_1_deg 7.853
r_angle_refined_deg 1.887
r_bond_refined_d 0.022
r_nbtor_refined 0.301
r_xyhbond_nbd_refined 0.18
r_symmetry_vdw_refined 0.179
r_symmetry_hbond_refined 0.276
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 1798
Nucleic Acid Atoms 0
Heterogen Atoms 17
Solvent Atoms 110

Software

Computing
Computing Package Purpose
HKL2000 Data Reduction (intensity integration)
SCALEPACK Data Reduction (data scaling)
AMORE Structure Solution
REFMAC 5.2.0019 Structure Refinement
Software
Software Name Purpose
REFMAC version: 5.2.0019 refinement
AMORE model building