☰ Navigation Tabs
Neutron Crystal Structure of Escherichia coli Dihydrofolate Reductase Bound to the Anti-cancer drug, Methotrexate
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 3DRC 3DRC (293 K E. COLI DHFR/MTX X-RAY STRUCTURE, 1.7A RESOLUTION)
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 7.5 277 16% (v/v) Polyethylene Glycol 400, 0.2 M CaCl2, 0.1 M Na-HEPES (pH = 7.5); complex [] = 50 mg/ml, Microbatch under parrafin oil, temperature 277K, pH 7.50
Crystal Properties Matthews coefficient Solvent content 2.56 52.03
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 93.12 α = 90 b = 93.12 β = 90 c = 73.87 γ = 120
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 neutron 293 AREA DETECTOR TIME-OF-FLIGHT MULTIWIRE HE3 NEUTRON DETECTOR 2005-02-15 L LAUE
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 0.6-7.0
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 2.17 38.6 79.7 0.136 0.07 3.7 2.9 14213 1.5
Highest Resolution Shell ID # Resolution (High) Resolution (Low) Percent Possible (All) Percent Possible (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All) 1 2.17 2.29 63.7 0.325 1.7 1.7
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Starting model Resolution (High) Resolution (Low) Cut-off Sigma (F) Number Reflections (All) Number Reflections (R-Free) Percent Reflections (Observed) R-Work (Depositor) R-Free (Depositor) R-Free Selection Details Mean Isotropic B NEUTRON DIFFRACTION FOURIER SYNTHESIS THROUGHOUT 3DRC (293 K E. COLI DHFR/MTX X-RAY STRUCTURE, 1.7A RESOLUTION) 2.2 6.5 3 14213 702 79.7 0.233 RANDOM
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 s_zero_chiral_vol 0.059 s_anti_bump_dis_restr 0.057 s_non_zero_chiral_vol 0.052 s_angle_d 0.048 s_bond_d 0.046 s_from_restr_planes 0.016 s_similar_dist s_rigid_bond_adp_cmpnt s_similar_adp_cmpnt s_approx_iso_adps
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 2516 Nucleic Acid Atoms Solvent Atoms 152 Heterogen Atoms 66
Software Software Software Name Purpose d*TREK data scaling SHELXL-97 model building SHELXL-97 refinement d*TREK data reduction CCP4 data scaling SHELXL-97 phasing