6LHI

Quadruple mutant (N51I+C59R+S108N+I164L) plasmodium falciparum dihydrofolate reductase-thymidylate synthase (PfDHFR-TS) complexed with C466 (compound 42) and NADPH

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	4DP3

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICROBATCH	4.6	298	0.1M sodium acetate, pH 4.6, 0.2M ammonium acetate, 25% PEG 4000

Crystal Properties
Matthews coefficient	Solvent content
2.606	52.8

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 56.308	α = 90
b = 154.488	β = 90
c = 163.939	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	2.59	46.41	90.8	0.071	9.8	7.874		40994

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	2.59	2.7			0.479	2.1

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	2.59	46.41	40994	2081	90.138	0.247	0.2435	0.3112	39.668

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]
12.679			-14.449		1.77

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.017
r_dihedral_angle_3_deg	18.357
r_dihedral_angle_4_deg	17.358
r_dihedral_angle_1_deg	8.665
r_lrange_it	8.657
r_lrange_other	8.657
r_mcangle_it	6.145
r_mcangle_other	6.144
r_scangle_other	5.433
r_scangle_it	5.432
r_mcbond_it	3.822
r_mcbond_other	3.82
r_scbond_it	3.467
r_scbond_other	3.467
r_angle_other_deg	2.316
r_angle_refined_deg	1.719
r_symmetry_xyhbond_nbd_refined	0.489
r_nbd_other	0.248
r_symmetry_nbd_other	0.226
r_symmetry_nbd_refined	0.225
r_nbd_refined	0.216
r_nbtor_refined	0.18
r_xyhbond_nbd_refined	0.158
r_symmetry_nbtor_other	0.075
r_chiral_restr	0.074
r_symmetry_xyhbond_nbd_other	0.046
r_bond_other_d	0.034
r_gen_planes_other	0.022
r_gen_planes_refined	0.011
r_bond_refined_d	0.009

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8857
Nucleic Acid Atoms
Solvent Atoms	96
Heterogen Atoms	202

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
HKL-2000	data scaling
MOLREP	phasing