6CW7

E. coli DHFR product complex with (6S)-5,6,7,8-TETRAHYDROFOLATE


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 7DFR 

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, SITTING DROP6.5293.1520 mg/ml protein working stock was prepared from 2:1 v/v mixing of 30mg/ml protein in 20mM Tris pH 8, 1mM DTT and 50mM HEPES pH 7.3, 100mM NaCl. Then the working protein stock at 20 mg/ml is mixed at 1:1 v/v ratio with reservoir solution of 0.1M MES pH 6.5, 30% PEG3350, 0.4M MgCl2
Crystal Properties
Matthews coefficientSolvent content
1.8433.22

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 33.861α = 90
b = 51.529β = 90
c = 77.841γ = 90
Symmetry
Space GroupP 21 21 21

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100CCDRAYONIX MX-225Diamond(111)2017-12-08MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONAPS BEAMLINE 31-ID0.97931APS31-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
11.0331.05797.30.06412.576.3546591610.76
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)
11.031.0984.21.0191.013.06

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodStarting modelResolution (High)Resolution (Low)Cut-off Sigma (F)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-WorkR-FreeMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUT7DFR1.0331.061.3465896199597.30.1860.1860.20616.39
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
KeyRefinement Restraint Deviation
f_dihedral_angle_d13.331
f_angle_d1.387
f_chiral_restr0.074
f_bond_d0.008
f_plane_restr0.007
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms1297
Nucleic Acid Atoms
Solvent Atoms205
Heterogen Atoms39

Software

Software
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing
PDB_EXTRACTdata extraction