3NXV

Preferential Selection of Isomer Binding from Chiral Mixtures: Alternate Binding Modes Observed for the E- and Z-isomers of a Series of 5-Substituted 2,4-Diaminofuro[2,3-d]pyrimidines as Ternary Complexes with NADPH and Human Dihydrofolate Reductase

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1U70

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.9	298	100 mM K2PO4, 60% saturated ammonium sulfate, 3% v/v ethanol, pH 6.9, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.49	50.58

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 83.998	α = 90
b = 83.998	β = 90
c = 78.273	γ = 120

Symmetry
Space Group	H 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	200	IMAGE PLATE	RIGAKU RAXIS IV	mirrors	2008-12-06	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU300	1.54198

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	1.9	26.1	99.8	0.055	0.064	14.4	3.5	16181	15367	2	2	28.6

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	1.9	2	98.6		0.16	0.19	6	3.1	2311

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 17u0	1.9	26.09	2	2	15367	15363	811	99.79	0.19536	0.19278	0.2456	RANDOM	16.456

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]
-0.01	-0.01		-0.01		0.02

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.116
r_dihedral_angle_4_deg	17.265
r_dihedral_angle_3_deg	16.464
r_dihedral_angle_1_deg	6.712
r_scangle_it	5.347
r_scbond_it	3.554
r_angle_refined_deg	2.354
r_mcangle_it	2.205
r_mcbond_it	1.292
r_chiral_restr	0.216

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.116
r_dihedral_angle_4_deg	17.265
r_dihedral_angle_3_deg	16.464
r_dihedral_angle_1_deg	6.712
r_scangle_it	5.347
r_scbond_it	3.554
r_angle_refined_deg	2.354
r_mcangle_it	2.205
r_mcbond_it	1.292
r_chiral_restr	0.216
r_bond_refined_d	0.025
r_gen_planes_refined	0.012

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1502
Nucleic Acid Atoms
Solvent Atoms	92
Heterogen Atoms	78

Software

Software
Software Name	Purpose
CrystalClear	data collection
MOLREP	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	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.