Experiment: 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)
Type	Source	Accession Code	Details
experimental model	PDB	1AI9	CANDIDA ALBICANS DHFR (PDB ENTRY 1AI9)

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	277	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 Properties
Matthews coefficient	Solvent content
2.27	43

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 #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293	AREA DETECTOR	XENTRONICS	Huber graphite monochromator	1989-08-11	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ELLIOTT 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)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.85	25	97.6	0.0739	0.0739	7.77	3.58	117195	32740	-3		32.64

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)	Redundancy	Number Unique Reflections (All)
	1.85	1.96	91.1		0.2926	0.2926	1.3	1.98	5054

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (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-Work (Depositor)	R-Free (Depositor)	Mean Isotropic B
X-RAY DIFFRACTION	DIRECT REPLACEMENT	CANDIDA ALBICANS DHFR (PDB ENTRY 1AI9)	1.85	10	2	32740	26626		97.6	0.159	0.159	0.159

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
Key	Refinement Restraint Deviation
p_transverse_tor	29.9
p_staggered_tor	14.9
p_scangle_it	7.048
p_scbond_it	5.613
p_mcangle_it	5.223
p_mcbond_it	4.437
p_planar_tor	3.9
p_chiral_restr	0.258
p_singtor_nbd	0.17
p_multtor_nbd	0.15

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	29.9
p_staggered_tor	14.9
p_scangle_it	7.048
p_scbond_it	5.613
p_mcangle_it	5.223
p_mcbond_it	4.437
p_planar_tor	3.9
p_chiral_restr	0.258
p_singtor_nbd	0.17
p_multtor_nbd	0.15
p_xyhbond_nbd	0.15
p_planar_d	0.041
p_angle_d	0.035
p_bond_d	0.021
p_plane_restr	0.02
p_hb_or_metal_coord
p_xhyhbond_nbd
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3180
Nucleic Acid Atoms
Solvent Atoms	331
Heterogen Atoms	148

Software

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