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 Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Vapor Diffusion Hanging Drop
pH 6.5
Temperature 277.0
Details DIHYDRO-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 Data

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

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 293
Diffraction Detector
Detector Diffraction Type Details Collection Date
AREA DETECTOR XENTRONICS Huber graphite monochromator 1989-08-11
Diffraction Radiation
Monochromator Protocol
Huber graphite monochromator SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
ROTATING ANODE ELLIOTT GX-21 -- -- --

Data Collection

Overall
Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge I (Observed) R Sym I (Observed) Net I Over Average Sigma (I) Redundancy Number Reflections (All) Number Reflections (Observed) Observed Criterion Sigma (F) Observed Criterion Sigma (I) B (Isotropic) From Wilson Plot
1.85 25 97.6 0.0739 0.0739 -- 3.58 117195 32740 -3.0 0.0 32.64
High Resolution Shell
Resolution (High) Resolution (Low) Percent Possible (All) R Merge I (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All)
1.85 1.96 91.1 0.2926 0.2926 1.3 1.98 5054

Refinement

Statistics
Structure Solution Method Refinement High Resolution Refinement Low Resolution Cut-off Sigma (I) Cut-off Sigma (F) Number of Reflections (All) Number of Reflections (Observed) Number of Reflections (R-Free) Percent Reflections (Observed) R-Factor (All) R-Factor (Observed) R-Work R-Free R-Free Selection Details
DIRECT REPLACEMENT 1.85 10.0 0.0 2.0 32740 26626 -- 97.6 0.159 0.159 0.159 -- --
High Resolution Shell
Refinement method Shell Resolution (High) Shell Resolution (Low) # of Reflections (Observed) # of Reflections (R-Free) # of Reflections (R-Work) R-Factor (R-Work) R-Factor (R-Free) R-Factor (R-Free Error) Percent Reflections (Observed)
X Ray Diffraction 1.85 1.98 3026 -- -- 0.208 -- -- --
X Ray Diffraction 1.98 2.14 4131 -- -- 0.186 -- -- --
X Ray Diffraction 2.14 2.36 4527 -- -- 0.169 -- -- --
X Ray Diffraction 2.36 2.7 4818 -- -- 0.166 -- -- --
X Ray Diffraction 2.7 3.4 5091 -- -- 0.149 -- -- --
X Ray Diffraction 3.4 10.0 5033 -- -- 0.145 -- -- --
Temperature Factor Modeling
Temperature Factor Value
Isotropic Thermal Model Konnert, J.H. & Hendrickson, W.A. (1980) Acta Crystallogr. A A36, 344.
RMS Deviations
Key Refinement Restraint Deviation
p_multtor_nbd 0.15
p_angle_d 0.035
p_scangle_it 7.048
p_plane_restr 0.02
p_transverse_tor 29.9
p_planar_d 0.041
p_mcangle_it 5.223
p_scbond_it 5.613
p_mcbond_it 4.437
p_staggered_tor 14.9
p_singtor_nbd 0.17
p_bond_d 0.021
p_chiral_restr 0.258
p_planar_tor 3.9
p_xyhbond_nbd 0.15
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 3180
Nucleic Acid Atoms 0
Heterogen Atoms 148
Solvent Atoms 331

Software

Software
Software Name Purpose
XENGEN data reduction
FRODO model building
PROFFT refinement
XENGEN data scaling