3H21

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
2.75	55.34

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 97.544	α = 90
b = 97.544	β = 90
c = 263.811	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		2004-02-16	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 22-ID	1.0	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	2.32	47.96	92.2	0.057	40	8	30565	30565

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	2.32	2.4	57.6		0.206	4.7	5.9	1844

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	2.32	47.96	30526	1539	92.23	0.2143	0.21184	0.26287	RANDOM	55.437

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]
2.43	1.22		2.43		-3.65

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.581
r_dihedral_angle_4_deg	19.536
r_dihedral_angle_3_deg	17.774
r_dihedral_angle_1_deg	5.99
r_scangle_it	4.266
r_scbond_it	2.634
r_angle_refined_deg	1.862
r_mcangle_it	1.741
r_mcbond_it	1.011
r_nbtor_refined	0.306
r_symmetry_vdw_refined	0.289
r_nbd_refined	0.22
r_xyhbond_nbd_refined	0.145
r_chiral_restr	0.112
r_symmetry_hbond_refined	0.089
r_bond_refined_d	0.019
r_gen_planes_refined	0.006
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	4025
Nucleic Acid Atoms
Solvent Atoms	82
Heterogen Atoms	68

Software

Software
Software Name	Purpose
SERGUI	data collection
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling