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)
Type	Source	Accession Code	Details
experimental model	PDB	1AI9	Candida albicans DHFR NADPH complex (1AI9)

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	277	dihydro-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 coefficient	Solvent content
2.24	45.09

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 #	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	1988-04-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ELLIOTT GX-21	1.5418

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)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.7	25	81.8	0.05	0.05	21.26	3.26	113037	34713		-3	30.9

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)	Redundancy	Number Unique Reflections (All)
	1.7	1.81	41.14		0.2237	0.2237	2.15	2.31	2894

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	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	DIRECT REPLACEMENT	Candida albicans DHFR NADPH complex (1AI9)	1.7	10	2	34713	31488		81.8	0.156	0.156	0.156

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
Key	Refinement Restraint Deviation
p_transverse_tor	31.4
p_staggered_tor	16.1
p_scangle_it	5.478
p_scbond_it	4.073
p_planar_tor	4
p_mcangle_it	3.218
p_mcbond_it	2.63
p_chiral_restr	0.276
p_singtor_nbd	0.166
p_multtor_nbd	0.154

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	31.4
p_staggered_tor	16.1
p_scangle_it	5.478
p_scbond_it	4.073
p_planar_tor	4
p_mcangle_it	3.218
p_mcbond_it	2.63
p_chiral_restr	0.276
p_singtor_nbd	0.166
p_multtor_nbd	0.154
p_xyhbond_nbd	0.127
p_planar_d	0.04
p_angle_d	0.034
p_bond_d	0.021
p_plane_restr	0.021
p_hb_or_metal_coord
p_xhyhbond_nbd
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3195
Nucleic Acid Atoms
Solvent Atoms	236
Heterogen Atoms	144

Software

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

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.