1F4C

CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COVALENTLY MODIFIED AT C146 WITH N-[TOSYL-D-PROLINYL]AMINO-ETHANETHIOL

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	293	2.0 M ammonium sulphate, 20 mM potassium phosphate, 0.2 M EDTA, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 20.0K

Crystal Properties
Matthews coefficient	Solvent content
2.5	51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 126.22	α = 90
b = 126.22	β = 90
c = 67.02	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	100	IMAGE PLATE	RIGAKU RAXIS IV		1999-02-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH3R

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	10	98.8	0.044	14.7	2.4	41001	41001			26.9

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)
1	2	2.07	94.5		0.26	28.2	3.8	2.15	3916

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION		THROUGHOUT	2	10	41001	41001	2052	98.8	0.202	0.202	0.198	0.268	random	34.7

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
p_transverse_tor	26.9
p_staggered_tor	14.7
p_planar_tor	4.1
p_scangle_it	2.29
p_mcangle_it	2.17
p_scbond_it	1.51
p_mcbond_it	1.43
p_multtor_nbd	0.24
p_singtor_nbd	0.178
p_xyhbond_nbd	0.139

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	26.9
p_staggered_tor	14.7
p_planar_tor	4.1
p_scangle_it	2.29
p_mcangle_it	2.17
p_scbond_it	1.51
p_mcbond_it	1.43
p_multtor_nbd	0.24
p_singtor_nbd	0.178
p_xyhbond_nbd	0.139
p_chiral_restr	0.113
p_planar_d	0.035
p_angle_d	0.03
p_bond_d	0.01
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4271
Nucleic Acid Atoms
Solvent Atoms	509
Heterogen Atoms	73

Software

Software
Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
d*TREK	data scaling

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.