1IA4

Candida albicans dihydrofolate reductase complex in which the dihydronicotinamide moiety of dihydro-nicotinamide-adenine-dinucleotide phosphate (NADPH) is displaced by 5-{[4-(4-MORPHOLINYL)PHENYL]SULFANYL}-2,4-QUINAZOLINEDIAMIN (GW2021)


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1AI9CANDIDA ALBICANS DHFR (PDB ENTRY 1AI9)

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP6.5277DIHYDRO-NICOTINAMIDE-ADENINE- DINUCLEOTIDE PHOSPHATE (NADPH), 5-{[4-(4-MORPHOLINYL) PHENYL]SULFANYL}-2,4-QUINAZOLINEDIAMINE (GW2021), PEG-3350, POTASSIUM 4-MORPHILINEETHANESULFONIC ACID, DITHIOTHREITOL A THREE-FOLD EXCESS OF GW2021 AND THREE-FOLD EXCESS OF NADPH WAS ADDED TO THE C. ALBICANS DHFR SOLUTION AND LET STAND 277K OVERNIGHT. 17-20 MG/ML C. ALBICANS DHFR IN 50 UM GW995, 50 UM NADPH, 20 MM KMES, 1 MM DTT, PH 6.5 WAS MIXED WITH AN EQUAL PART OF 26 - 34% PEG-3350, THE RESERVOIR SOLUTION. , VAPOR DIFFUSION, HANGING DROP
Crystal Properties
Matthews coefficientSolvent content
2.2743

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 77.05α = 90
b = 67.09β = 93.43
c = 38.54γ = 90
Symmetry
Space GroupP 1 21 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray293AREA DETECTORXENTRONICSHuber graphite monochromator1989-08-11MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1ROTATING ANODEELLIOTT GX-21

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
11.852597.60.07390.07397.773.5811719532740-332.64
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)
1.851.9691.10.29260.29261.31.985054

Refinement

Statistics
Diffraction IDStructure Solution MethodStarting modelResolution (High)Resolution (Low)Cut-off Sigma (F)Number Reflections (All)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (All)R-Factor (Observed)R-WorkR-FreeMean Isotropic B
X-RAY DIFFRACTIONDIRECT REPLACEMENTCANDIDA ALBICANS DHFR (PDB ENTRY 1AI9)1.85102327402662697.60.1590.1590.159
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
p_transverse_tor29.9
p_staggered_tor14.9
p_scangle_it7.048
p_scbond_it5.613
p_mcangle_it5.223
p_mcbond_it4.437
p_planar_tor3.9
p_chiral_restr0.258
p_singtor_nbd0.17
p_multtor_nbd0.15
RMS Deviations
KeyRefinement Restraint Deviation
p_transverse_tor29.9
p_staggered_tor14.9
p_scangle_it7.048
p_scbond_it5.613
p_mcangle_it5.223
p_mcbond_it4.437
p_planar_tor3.9
p_chiral_restr0.258
p_singtor_nbd0.17
p_multtor_nbd0.15
p_xyhbond_nbd0.15
p_planar_d0.041
p_angle_d0.035
p_bond_d0.021
p_plane_restr0.02
p_hb_or_metal_coord
p_xhyhbond_nbd
p_special_tor
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms3180
Nucleic Acid Atoms
Solvent Atoms331
Heterogen Atoms148

Software

Software
Software NamePurpose
X-GENdata reduction
FRODOmodel building
PROFFTrefinement
X-GENdata scaling