3NXO

Perferential Selection of Isomer Binding from Chiral Mixtures: Alternate Binding Modes Observed for the E- and Z-isomers of a Series of 5-Substituted 2,4-Diaminofuro[2,3-d]pyrimidines as Ternary Complexes with NADPH and Human Dihydrofolate Reductase


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1U70PDB entry 1u70.pdb

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP6.9298K2PO4 with 30% saturated ammonium sulfate with 3% v/v ethanol, pH 6.9, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Crystal Properties
Matthews coefficientSolvent content
2.4950.51

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 84.15α = 90
b = 84.15β = 90
c = 77.968γ = 120
Symmetry
Space GroupH 3

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray200CCDMARMOSAIC 325 mm CCDmirrors2008-12-06MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONSSRL BEAMLINE BL9-20.975SSRLBL9-2

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)RedundancyNumber Reflections (All)Number Reflections (Observed)Observed Criterion Sigma (F)Observed Criterion Sigma (I)B (Isotropic) From Wilson Plot
11.3526.699.90.0680.02518.98.745729451972220.1
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)R Merge I (Observed)R-Sym I (Observed)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
11.351.4299.90.50.174.48.26605

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodStarting modelResolution (High)Resolution (Low)Cut-off Sigma (I)Number Reflections (All)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (All)R-Factor (Observed)R-WorkR-FreeR-Free Selection DetailsMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUTPDB entry 1u70.pdb1.3526.6224519742917227699.940.19670.192230.191320.20892RANDOM16.678
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]
0.01
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg37.888
r_dihedral_angle_4_deg18.495
r_dihedral_angle_3_deg14.454
r_dihedral_angle_1_deg7.071
r_scangle_it5.297
r_scbond_it3.618
r_angle_refined_deg2.788
r_mcangle_it2.491
r_mcbond_it1.492
r_chiral_restr0.176
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg37.888
r_dihedral_angle_4_deg18.495
r_dihedral_angle_3_deg14.454
r_dihedral_angle_1_deg7.071
r_scangle_it5.297
r_scbond_it3.618
r_angle_refined_deg2.788
r_mcangle_it2.491
r_mcbond_it1.492
r_chiral_restr0.176
r_bond_refined_d0.034
r_gen_planes_refined0.015
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms1504
Nucleic Acid Atoms
Solvent Atoms165
Heterogen Atoms97

Software

Software
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling