Experiment: 2FX3

Crystal Structure Determination of E. coli Elongation Factor, Tu using a Twinned Data Set

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1D8T	PDB entry 1D8T, chain A

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.8	293	0.45 mM EF-Tu in 50 mM Tris, pH 7.8, 10 mM GDP, 10 mM magnesium chloride, 0.5% PEG 3350, 5.5 mM ammonium acetate, 2.7 mM ammonium citrate, 1.34 mM ChemDiv compound 1013-0135, VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.74	55.05

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.55	α = 90
b = 69.55	β = 90
c = 169.44	γ = 120

Symmetry
Space Group	P 31 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	95	CCD	ADSC QUANTUM 4		2004-08-24	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	1.033	ALS	5.0.2

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	3.4	60.232	90.2	0.174	0.174	3.2	6.6		6312

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)
	3.4	3.58	84.9	84.9	0.48	0.48	1.5	6.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1D8T, chain A	3.4	60.232	6987	6083	586	87.1	0.197	0.1936	0.2619	0.2457	Used CNS task file make_cv_twin.inp to select cross-validation set such that pairs of twin-related reflections were designated to be in the same set, either the working set or the test set.	75.7

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]
8.819	2.011		8.819		-17.639

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	24.688
c_angle_deg	1.73
c_improper_angle_d	1.184
c_bond_d	0.0114

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2981
Nucleic Acid Atoms
Solvent Atoms	4
Heterogen Atoms	29

Software

Software
Software Name	Purpose
SCALA	data scaling
PHASER	phasing
CNS	refinement
PDB_EXTRACT	data extraction
MOSFLM	data reduction
CCP4	data scaling