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BETA FORM OF CARBOXYPEPTIDASE A (RESIDUES 3-307) FROM BOVINE PANCREAS IN AN ORTHORHOMBIC CRYSTAL FORM WITH TWO ZINC IONS IN THE ACTIVE SITE.
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 5CPA 5CPA WITHOUT WATERS AND ZN
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 MICRODIALYSIS 7.5 CPA FROM SIGMA #C0261 WAS DISSOLVED IN 1.0 M LICL WITH 20 MM TRIS-HCL PH 7.5 TO GIVE 12 MG/ML AND USED WITHOUT FURTHER PURIFICATION. THIS PROTEIN SOLUTION WAS PLACED IN 50 MICROL DIALYSIS BUTTONS FROM HAMPTON RESEARCH AND DIALYZED AGAINST A 2 ML RESERVOIR OF THE ABOVE MENTIONED BUFFER WHILE LOWERING THE EXTERNAL LICL CONCENTRATION BY 25% EVERY OTHER DAY. THE CRYSTALS APPEARED A~0.24 M LICL AND WAS STORED AT 0.30M LICL. IF THIS PROCEDURE DOES NOT WORK BY ITSELF AND YOU END UP WITH THE MONOCLINIC ALPHA-FORM (1-307), YOU CAN TRY TO AD TRACES OF TRYPSIN (~10 MICROG/ML) TO THE PROTEIN SOLUTION TO PROVOKE FORMATION OF THE BETA-FORM (3-307), micro dialysis
Crystal Properties Matthews coefficient Solvent content 2.25 45
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 48.79 α = 90 b = 66.85 β = 90 c = 96.02 γ = 90
Symmetry Space Group P 21 21 21
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 x-ray 290 IMAGE PLATE RIGAKU RAXIS II 1996-12-06 M SINGLE WAVELENGTH
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 ROTATING ANODE RIGAKU RU200
Data Collection Overall ID # 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 2 40 94.1 0.038 0.038 30.7 4.3 20453 19
Highest Resolution Shell ID # Resolution (High) Resolution (Low) Percent Possible (All) Percent Possible (Observed) R Merge I (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All) 2 2.03 67.7 0.157 0.157 7.1 3.9
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Starting model Resolution (High) Resolution (Low) Number Reflections (Observed) Number Reflections (R-Free) Percent Reflections (Observed) R-Factor (Observed) R-Work (Depositor) R-Work (DCC) R-Free (Depositor) R-Free (DCC) R-Free Selection Details Mean Isotropic B X-RAY DIFFRACTION MOLECULAR REPLACEMENT THROUGHOUT 5CPA WITHOUT WATERS AND ZN 2 8 20060 977 93.4 0.167 0.167 0.1549 0.226 0.209 RANDOM 15.8
Temperature Factor Modeling Anisotropic B[1][1] Anisotropic B[1][2] Anisotropic B[1][3] Anisotropic B[2][2] Anisotropic B[2][3] Anisotropic B[3][3]
RMS Deviations Key Refinement Restraint Deviation x_dihedral_angle_d 22.4 x_scbond_it 2.876 x_scangle_it 2.8 x_mcangle_it 2.277 x_mcbond_it 2.221 x_angle_deg 2.001 x_improper_angle_d 1.238 x_bond_d 0.01 x_bond_d_na x_bond_d_prot
RMS Deviations Key Refinement Restraint Deviation x_dihedral_angle_d 22.4 x_scbond_it 2.876 x_scangle_it 2.8 x_mcangle_it 2.277 x_mcbond_it 2.221 x_angle_deg 2.001 x_improper_angle_d 1.238 x_bond_d 0.01 x_bond_d_na x_bond_d_prot x_angle_d x_angle_d_na x_angle_d_prot x_angle_deg_na x_angle_deg_prot x_dihedral_angle_d_na x_dihedral_angle_d_prot x_improper_angle_d_na x_improper_angle_d_prot
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 2421 Nucleic Acid Atoms Solvent Atoms 277 Heterogen Atoms 3
Software Software Software Name Purpose DENZO data reduction SCALEPACK data scaling AMoRE phasing X-PLOR refinement