1DDU

E. COLI THYMIDYLATE SYNTHASE IN COMPLEX WITH CB3717 AND 2',5'-DIDEOXYURIDINE (DDURD)

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1TDU	PDB ENTRY 1TDU

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.8		CRYSTALLIZATION WAS CONDUCTED IN HANGING DROPS CONTAINING 4.2 MG/ML E. COLI TS, 0.38 MM DURD, 3.8 MM DTT, 1.0 MM CB3717 AND 1.2 M (NH4)2SO4, PH 7.8 (20 MM KPO4) OVER A WELL SOLUTION CONTAINING 2.4 M (NH4)2SO4 AND 1.0 MM DTT., vapor diffusion - hanging drop

Crystal Properties
Matthews coefficient	Solvent content
2.56	52.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 127.405	α = 90
b = 127.405	β = 90
c = 68.203	γ = 120

Symmetry
Space Group	P 63

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	298	IMAGE PLATE	RIGAKU		1996-11-25	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	2.1	50	70.1	0.068	0.068	5.1	2.6		37027			14.1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2.1	2.16	49.8		0.252	0.252	1.6	2.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	DIFFERENCE FOURIER	THROUGHOUT	PDB ENTRY 1TDU	2.1	8	2	15938	1688	78.4	0.188	0.188	0.272	SHELLS	24.3

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
x_dihedral_angle_d	26
x_scangle_it	3.27
x_angle_deg	3.1
x_mcangle_it	2.24
x_scbond_it	2.12
x_mcbond_it	1.35
x_improper_angle_d	1.15
x_bond_d	0.013
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4298
Nucleic Acid Atoms
Solvent Atoms	66
Heterogen Atoms	120

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing