2FTQ

E. coli thymidylate synthase at 1.8 A resolution

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	298	2.5 M ammonium sulfate, 20 mM KH2PO4, 4 mM DTT, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
3.08	60.07

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 131.234	α = 90
b = 131.234	β = 90
c = 131.234	γ = 90

Symmetry
Space Group	I 21 3

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	ADSC QUANTUM 4		2002-08-24	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 14-BM-C	0.9	APS	14-BM-C

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	1.81	21.87	99	0.09	16	10	34259	34259

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	1.81	1.87	99		0.37	2.4	9	3420

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	isomorphous	THROUGHOUT	1.81	21.9	32531	1728	99.83	0.20316	0.20194	0.22556	RANDOM	22.978

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]

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.777
r_dihedral_angle_4_deg	18.491
r_dihedral_angle_3_deg	16.078
r_dihedral_angle_1_deg	6.835
r_scangle_it	3.068
r_scbond_it	2.268
r_angle_refined_deg	1.653
r_mcangle_it	1.248
r_angle_other_deg	1.063
r_mcbond_it	1.014
r_mcbond_other	0.295
r_symmetry_vdw_other	0.253
r_nbd_refined	0.223
r_nbd_other	0.208
r_symmetry_vdw_refined	0.2
r_nbtor_refined	0.17
r_symmetry_hbond_refined	0.14
r_xyhbond_nbd_refined	0.138
r_chiral_restr	0.107
r_nbtor_other	0.085
r_bond_refined_d	0.02
r_gen_planes_refined	0.008
r_bond_other_d	0.002
r_gen_planes_other	0.001
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2153
Nucleic Acid Atoms
Solvent Atoms	200
Heterogen Atoms	35

Software

Software
Software Name	Purpose
REFMAC	refinement
d*TREK	data scaling