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Crystal structure of a type III polyketide synthase PKS18 from Mycobacterium tuberculosis
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 1CGZ PDB ENTRY 1CGZ
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 VAPOR DIFFUSION, HANGING DROP 7.7 277 PEG 8000, HEPES, ethylene glycol, pH 7.7, VAPOR DIFFUSION, HANGING DROP, temperature 277K
Crystal Properties Matthews coefficient Solvent content 2.5 50.4
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 59.914 α = 108.23 b = 80.654 β = 92.97 c = 99.612 γ = 103.69
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 x-ray 100 IMAGE PLATE MARRESEARCH 2003-09-26 M SINGLE WAVELENGTH
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 ROTATING ANODE RIGAKU RU300 1.5418
Data Collection Overall ID # Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge 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 2.25 25 95.1 0.07 9.5 1.74 80874 76912 35.5
Highest Resolution Shell ID # Resolution (High) Resolution (Low) Percent Possible (All) Percent Possible (Observed) R Merge I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All) 1 2.25 2.36 91.2 0.307 2 1.7 7360
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Starting model Resolution (High) Resolution (Low) Number Reflections (All) 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 PDB ENTRY 1CGZ 2.25 24.87 76912 76912 3858 95 0.205 0.205 0.2013 0.265 0.2014 RANDOM 36.7
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] 5.77 0.5 -2.32 -2.35 -0.4 -3.42
RMS Deviations Key Refinement Restraint Deviation c_dihedral_angle_d 23.3 c_scangle_it 3.11 c_scbond_it 2.15 c_mcangle_it 2.1 c_angle_deg 1.4 c_mcbond_it 1.31 c_improper_angle_d 0.9 c_bond_d 0.007
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 10856 Nucleic Acid Atoms Solvent Atoms 1106 Heterogen Atoms 64
Software Software Software Name Purpose CNS refinement DENZO data reduction SCALEPACK data scaling CCP4 phasing