3K45

Alternate Binding Modes Observed for the E- and Z-isomers of 2,4-Diaminofuro[2,3d]pyrimidines as Ternary Complexes with NADPH and Mouse Dihydrofolate Reductase

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2FZJ	PDB ENTRY 2FZJ

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8.3		200 MM TRIS, PH 8.3, 85 MM NA CACODYLATE, 25% PEG 4K, VAPOR DIFFUSION, HANGING DROP, TEMPERATURE 298K

Crystal Properties
Matthews coefficient	Solvent content
2.27	45.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 41.358	α = 90
b = 61.094	β = 117.13
c = 43.304	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	200	IMAGE PLATE	RIGAKU RAXIS IV		2007-08-23	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200

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	1.6	17.82	98.5	0.074	0.7	8.2	2.4		24297		1	33.2

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	1.6	1.64	95.3		0.39	0.49	3.3	1.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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 2FZJ	1.6	17.82	1	23070	1227	95.8	0.198	0.196	0.242	RANDOM	33.86

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

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.825
r_dihedral_angle_4_deg	18.799
r_dihedral_angle_3_deg	17.876
r_dihedral_angle_1_deg	5.844
r_sphericity_free	5.6
r_scangle_it	3.584
r_sphericity_bonded	3.368
r_scbond_it	2.719
r_rigid_bond_restr	2.004
r_mcangle_it	1.948
r_angle_refined_deg	1.843
r_mcbond_it	1.307
r_nbtor_refined	0.316
r_symmetry_vdw_refined	0.26
r_nbd_refined	0.204
r_xyhbond_nbd_refined	0.159
r_symmetry_hbond_refined	0.134
r_chiral_restr	0.12
r_bond_refined_d	0.014
r_gen_planes_refined	0.007
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1489
Nucleic Acid Atoms
Solvent Atoms	181
Heterogen Atoms	69

Software

Software
Software Name	Purpose
MOLREP	phasing
REFMAC	refinement
d*TREK	data reduction
SCALA	data scaling