X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
otherUNPUBLISHED HUMAN DHFR FOLATE COMPLEX

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP8.75277HUMAN DHFR/FOLATE COMPLEX WAS MIXED WITH NADPH AND TRIMETHOPRIM (BOTH 2 MM FINAL). CRYSTALS WERE GROWN BY HANGING DROP VAPOR DIFFUSION AT 277 K BY MIXING EQUAL VOLUMES OF PROTEIN/NADPH/TMP WITH RESERVOIR (24% PEG 4000, 200 MM LI2SO4, 100 MM TRIS.HCL, PH 8.75). TRUNCATED TRIANGULAR CRYSTALS APPEARED SLOWLY, IN ABOUT A MONTH. THE CRYSTAL WAS CRYOPROTECTED WITH 15% GLYCEROL AND FLASH-COOLED IN LIQUID N2.
Crystal Properties
Matthews coefficientSolvent content
2.3447.47

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 88.468α = 90
b = 94.014β = 90
c = 96.576γ = 90
Symmetry
Space GroupC 2 2 21

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100CCDADSC QUANTUM-1MIRRORS1997-07-14MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONCHESS BEAMLINE A1CHESSA1

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
11.52085.70.058.33.355140-1016
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)
11.51.5428.30.192.91.1

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodStarting modelResolution (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 REPLACEMENTTHROUGHOUTUNPUBLISHED HUMAN DHFR FOLATE COMPLEX1.59.952301281085.40.1810.1790.214RANDOM16.75
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]
0.190.09-0.28
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg37.78
r_dihedral_angle_4_deg13.104
r_dihedral_angle_3_deg11.995
r_dihedral_angle_1_deg5.766
r_scangle_it3.129
r_scbond_it2.433
r_mcangle_it1.633
r_angle_refined_deg1.506
r_mcbond_it1.377
r_angle_other_deg1.198
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg37.78
r_dihedral_angle_4_deg13.104
r_dihedral_angle_3_deg11.995
r_dihedral_angle_1_deg5.766
r_scangle_it3.129
r_scbond_it2.433
r_mcangle_it1.633
r_angle_refined_deg1.506
r_mcbond_it1.377
r_angle_other_deg1.198
r_nbd_refined0.2
r_nbd_other0.192
r_nbtor_refined0.175
r_symmetry_vdw_other0.166
r_xyhbond_nbd_refined0.15
r_symmetry_hbond_refined0.15
r_symmetry_vdw_refined0.089
r_chiral_restr0.087
r_nbtor_other0.081
r_bond_refined_d0.012
r_gen_planes_refined0.006
r_bond_other_d0.001
r_gen_planes_other0.001
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms2957
Nucleic Acid Atoms
Solvent Atoms408
Heterogen Atoms155

Software

Software
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing