1IA1

Candida albicans dihydrofolate reductase complexed with dihydro-nicotinamide-adenine-dinucleotide phosphate (NADPH) and 5-(PHENYLSULFANYL)-2,4-QUINAZOLINEDIAMINE (GW997)


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1AI9Candida albicans DHFR NADPH complex (1AI9)

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP6.5277dihydro-nicotinamide-adenine-dinucleotide phosphate (NADPH), 5-(phenysulfanyl)-2,4-quinazolinediamine (GW997), PEG-3350, Potassium 4-morphilineerhanesulfonic acid, dithiothreitol (DTT) a three-fold excess of GW997 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 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
2.2445.09

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 76.91α = 90
b = 67.28β = 93.07
c = 38.49γ = 90
Symmetry
Space GroupP 1 21 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray293AREA DETECTORXENTRONICSHuber graphite monochromator1988-04-28MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1ROTATING ANODEELLIOTT GX-211.5418

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
11.72581.80.050.0521.263.2611303734713-330.9
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)
1.71.8141.140.22370.22372.152.312894

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 NADPH complex (1AI9)1.7102347133148881.80.1560.1560.156
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_tor31.4
p_staggered_tor16.1
p_scangle_it5.478
p_scbond_it4.073
p_planar_tor4
p_mcangle_it3.218
p_mcbond_it2.63
p_chiral_restr0.276
p_singtor_nbd0.166
p_multtor_nbd0.154
RMS Deviations
KeyRefinement Restraint Deviation
p_transverse_tor31.4
p_staggered_tor16.1
p_scangle_it5.478
p_scbond_it4.073
p_planar_tor4
p_mcangle_it3.218
p_mcbond_it2.63
p_chiral_restr0.276
p_singtor_nbd0.166
p_multtor_nbd0.154
p_xyhbond_nbd0.127
p_planar_d0.04
p_angle_d0.034
p_bond_d0.021
p_plane_restr0.021
p_hb_or_metal_coord
p_xhyhbond_nbd
p_special_tor
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms3195
Nucleic Acid Atoms
Solvent Atoms236
Heterogen Atoms144

Software

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