3H26

Structural Studies of Pterin-Based Inhibitors of Dihydropteroate Synthase

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1TX0	PDB entry 1TX0

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	9	291	LITHIUM SULFATE, propane, Bis-Tris, pH 9, VAPOR DIFFUSION, HANGING DROP, temperature 291K

Crystal Properties
Matthews coefficient	Solvent content
2.76	55.51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 97.899	α = 90
b = 97.899	β = 90
c = 262.88	γ = 120

Symmetry
Space Group	P 62 2 2

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	MARRESEARCH		2004-12-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 22-ID	0.97922	APS	22-ID

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.5	84.78	98.7	0.091	19.6	11.4		26335

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.5	2.64	92.3		0.281	4.6	7.7	3491

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1TX0	2.5	50	26323	1326	100	0.23845	0.23635	0.27812	RANDOM	46.868

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]
6.03	3.02		6.03		-9.05

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.516
r_dihedral_angle_4_deg	19.936
r_dihedral_angle_3_deg	16.74
r_dihedral_angle_1_deg	5.093
r_angle_refined_deg	1.071
r_scangle_it	1.064
r_mcangle_it	0.692
r_scbond_it	0.608
r_mcbond_it	0.386
r_nbtor_refined	0.301
r_symmetry_vdw_refined	0.282
r_symmetry_hbond_refined	0.231
r_nbd_refined	0.211
r_xyhbond_nbd_refined	0.123
r_chiral_restr	0.078
r_bond_refined_d	0.007
r_gen_planes_refined	0.003
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
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4123
Nucleic Acid Atoms
Solvent Atoms	94
Heterogen Atoms	62

Software

Software
Software Name	Purpose
SERGUI	data collection
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling