3FSU

Crystal Structure of Escherichia coli Methylenetetrahydrofolate Reductase Double Mutant Phe223LeuGlu28Gln complexed with methyltetrahydrofolate

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1ZP4	PDB ENTRY 1zp4

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	5	298	100 mM sodium cacodylate buffer pH 5.0- 5.5, 225 mM Li2SO4, 5 % ethanol and 10 - 12 % PEG 4000, vapor diffusion, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.66	53.83

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 102.913	α = 90
b = 127.906	β = 121.73
c = 97.606	γ = 90

Symmetry
Space Group	C 1 2 1

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	NOIR-1		2008-06-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 4.2.2	1.00	ALS	4.2.2

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	1.7	43.71	99.8	0.033		3.75		117437

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)
	1.7	1.76	99.8		0.283	3.1	3.44	11668

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	Mean Isotropic B
X-RAY DIFFRACTION		THROUGHOUT	PDB ENTRY 1zp4	1.7	43.707	1.34	117404	5867	99.79	0.198	0.197	0.22	31.971

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
f_dihedral_angle_d	23.074
f_angle_d	1.097
f_chiral_restr	0.067
f_plane_restr	0.009
f_bond_d	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6459
Nucleic Acid Atoms
Solvent Atoms	400
Heterogen Atoms	238

Software

Software
Software Name	Purpose
d*TREK	data processing
PHENIX	refinement
PDB_EXTRACT	data extraction
d*TREK	data reduction
d*TREK	data scaling
PHENIX	phasing

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.