6LEV

Quadruple mutant (N51I+C59R+S108N+I164L) plasmodium falciparum dihydrofolate reductase-thymidylate synthase (PfDHFR-TS) complexed with compound 46 and NADPH

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICROBATCH	4.6	297	0.1 mM sodium acetate pH 4.6, 25% (w/v) PEG 4000, 0.2 M ammonium acetate

Crystal Properties
Matthews coefficient	Solvent content
2.77	55.64

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.703	α = 90
b = 155.878	β = 90
c = 164.8	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	Nonius Kappa CCD		2003-10-09	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ENRAF-NONIUS FR591	1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	2.64	10	90.6	0.103	10.8	5.1		45357

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.64	2.69			0.445

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	NONE	4DP3	2.644	10	39019	1915	87.813	0.191	0.1873	0.2716	50.814

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]
3.868			-0.901		-2.967

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.94
r_dihedral_angle_4_deg	18.764
r_dihedral_angle_3_deg	18.54
r_lrange_other	9.942
r_lrange_it	9.939
r_dihedral_angle_1_deg	8.555
r_mcangle_it	7.259
r_mcangle_other	7.258
r_scangle_it	6.991
r_scangle_other	6.991
r_mcbond_it	4.66
r_mcbond_other	4.659
r_scbond_it	4.505
r_scbond_other	4.501
r_angle_refined_deg	1.762
r_angle_other_deg	1.227
r_chiral_restr_other	0.947
r_nbd_other	0.275
r_symmetry_nbd_refined	0.254
r_nbd_refined	0.215
r_symmetry_nbd_other	0.187
r_xyhbond_nbd_refined	0.18
r_nbtor_refined	0.177
r_symmetry_xyhbond_nbd_refined	0.114
r_chiral_restr	0.109
r_symmetry_xyhbond_nbd_other	0.094
r_symmetry_nbtor_other	0.078
r_bond_refined_d	0.011
r_gen_planes_refined	0.008
r_bond_other_d	0.002
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8747
Nucleic Acid Atoms
Solvent Atoms	59
Heterogen Atoms	150

Software

Software
Software Name	Purpose
REFMAC	refinement
Coot	model building
HKL-2000	data scaling
DENZO	data reduction