2J31

The Role of Loop Bundle Hydrogen Bonds in the Maturation and Activity of(Pro)caspase-3


X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP8.52918 MG/ML PRO-CASPASE3 IN 10 MM TRIS- HCL, PH 8.5, 1 MM DTT. THE PROTEIN WAS CONCENTRATED TO 10 MG/ML USING AMICON ULTRAFREE CENTRIFUGAL FILTER DEVICES, AND INHIBITOR, AC-DEVD-CMK RECONSTITUTED IN DMSO, WAS THEN ADDED AT 5:1 WT:WT, INHIBITOR TO PEPTIDE. THE PROTEIN WAS DILUTED TO A CONCENTRATION OF 8 MG/ML BY ADDING 10 MM TRIS-HCL, PH 8.5, CONCENTRATED DTT AND CONCENTRATED NAN3 SO THAT THE FINAL BUFFER WAS 10 MM TRIS-HCL, PH 8.5, 10 MM DTT, 3 MM NAN3. 2 UL OF CONCENTRATED PROTEIN WAS MIXED 1:1 WITH WELL BUFFER THAT CONTAINED 100 MM SODIUM CITRATE, PH 5, 3 MM NAN3, 10 MM DTT AND 17% PEG 6000 W/V. SOLUTIONS WERE INCUBATED AT 18 DEG C USING THE HANGING DROP METHOD. CRYSTALS GREW WITHIN THREE DAYS FOR WILD-TYPE CASPASE-3 AND WITHIN TWO WEEKS FOR THE MUTANTS. THE IDEAL FREEZING CONDITIONS WERE FOUND TO BE WITH 80% MOTHER LIQUOR AND 20% PEG 400.
Crystal Properties
Matthews coefficientSolvent content
2.2144.02

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 67.332α = 90
b = 83.925β = 90
c = 95.504γ = 90
Symmetry
Space GroupI 2 2 2

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100CCDMARRESEARCHMSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONAPS BEAMLINE 22-IDAPS22-ID

Data Collection

Overall
ID #Resolution (High)Resolution (Low)Percent Possible (Observed)R Merge I (Observed)Net I Over Average Sigma (I)RedundancyNumber Reflections (All)Number Reflections (Observed)Observed Criterion Sigma (F)Observed Criterion Sigma (I)B (Isotropic) From Wilson Plot
11.55092.20.0934.65.149333217.7
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)R Merge I (Observed)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
11.51.5890.50.433.53

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodResolution (High)Resolution (Low)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-WorkR-FreeR-Free Selection DetailsMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUT1.533.6740798411193.50.20.20.216RANDOM23.8
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]
3.51.9-5.4
RMS Deviations
KeyRefinement Restraint Deviation
c_dihedral_angle_d24.3
c_scangle_it3.16
c_scbond_it2.1
c_mcangle_it1.7
c_angle_deg1.3
c_mcbond_it1.1
c_improper_angle_d1
c_bond_d0.005
c_bond_d_na
c_bond_d_prot
RMS Deviations
KeyRefinement Restraint Deviation
c_dihedral_angle_d24.3
c_scangle_it3.16
c_scbond_it2.1
c_mcangle_it1.7
c_angle_deg1.3
c_mcbond_it1.1
c_improper_angle_d1
c_bond_d0.005
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms1971
Nucleic Acid Atoms
Solvent Atoms204
Heterogen Atoms

Software

Software
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling