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 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-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 Data

Unit Cell
Length (Å) Angle (°)
a = 76.91 α = 90
b = 67.28 β = 93.07
c = 38.49 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 1988-08-30
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
1.75 25 90.1 0.0549 0.0549 -- 3.24 116944 36058 0.0 -3.0 36.3
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)
1.75 1.85 60.4 0.2694 0.2694 2.23 1.11 4005

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 1.78 10.0 0.0 2.0 36058 32308 -- 84.6 0.16 0.16 0.16 -- --
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 1.78 2.0 7123 -- -- 0.192 -- -- --
X Ray Diffraction 2.0 2.16 4897 -- -- 0.17 -- -- --
X Ray Diffraction 2.16 2.39 5136 -- -- 0.161 -- -- --
X Ray Diffraction 2.39 2.77 5394 -- -- 0.163 -- -- --
X Ray Diffraction 2.77 3.63 5470 -- -- 0.143 -- -- --
X Ray Diffraction 3.63 10.0 4288 -- -- 0.153 -- -- --
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_plane_restr 0.021
p_mcbond_it 0.847
p_multtor_nbd 0.148
p_transverse_tor 32.6
p_mcangle_it 1.462
p_singtor_nbd 0.167
p_xyhbond_nbd 0.136
p_staggered_tor 14.9
p_scangle_it 3.826
p_bond_d 0.021
p_scbond_it 2.401
p_planar_tor 3.8
p_planar_d 0.04
p_chiral_restr 0.243
p_angle_d 0.034
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 3181
Nucleic Acid Atoms 0
Heterogen Atoms 140
Solvent Atoms 350

Software

Software
Software Name Purpose
X-GEN data reduction
FRODO model building
PROFFT refinement
X-GEN data scaling