1IA3

Candida albicans dihydrofolate reductase complex in which the dihydronicotinamide moiety of dihydro-nicotinamide-adenine-dinucleotide phosphate (NADPH) is displaced by 5-[(4-TERT-BUTYLPHENYL)SULFANYL]-2,4-QUINAZOLINEDIAMINE (GW995)


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-TERT-BUTYLPHENYL) SULFANYL]-2,4-QUINAZOLINEDIAMINE (GW995), PEG-3350, POTASSIUM 4-MORPHILINEERHANESULFONIC ACID, DITHIOTHREITOL A THREE-FOLD EXCESS OF GW995 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 = 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 monochromator1988-08-30MSINGLE 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
11.752590.10.05490.054916.183.2411694436058-336.3
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)
1.751.8560.40.26940.26942.231.114005

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)1.78102360583230884.60.160.160.16
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_tor32.6
p_staggered_tor14.9
p_scangle_it3.826
p_planar_tor3.8
p_scbond_it2.401
p_mcangle_it1.462
p_mcbond_it0.847
p_chiral_restr0.243
p_singtor_nbd0.167
p_multtor_nbd0.148
RMS Deviations
KeyRefinement Restraint Deviation
p_transverse_tor32.6
p_staggered_tor14.9
p_scangle_it3.826
p_planar_tor3.8
p_scbond_it2.401
p_mcangle_it1.462
p_mcbond_it0.847
p_chiral_restr0.243
p_singtor_nbd0.167
p_multtor_nbd0.148
p_xyhbond_nbd0.136
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 Atoms3181
Nucleic Acid Atoms
Solvent Atoms350
Heterogen Atoms140

Software

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