4FID

Crystal structure of a heterotrimeric G-Protein subunit from entamoeba histolytica, EHG-ALPHA-1

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.6	291	EHG-ALPHA-1 AT 15 MG/ML IN CRYSTALLIZATION BUFFER (50 MM HEPES PH 6.5, 150 MM NACL, 10 MM MGCL2, 10 MM NAF, 30 MICROM ALCL3, AND 50 MICROM GDP) WAS MIXED 1:1 AND EQUILIBRATED AGAINST CRYSTALLIZATION SOLUTION CONTAINING 1.5 M AMMONIUM SULFATE, 175 MM K/NA TARTRATE, AND 100 MM SODIUM CITRATE PH 5.6. 250 MM AMMONIUM ACETATE WAS ADDED TO THE WELL SOLUTION AFTER SETTING THE DROPS, VAPOR DIFFUSION, HANGING DROP, TEMPERATURE 291K

Crystal Properties
Matthews coefficient	Solvent content
2.42	49.26

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 56.671	α = 90
b = 57.174	β = 90
c = 231.289	γ = 90

Symmetry
Space Group	P 21 21 21

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	MAR scanner 300 mm plate		2011-03-05	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-D		APS	23-ID-D

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.6	45.9	99.3				43503		1.37

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	2.6	2.62	100		0.982	2.6	13.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	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	SAD	2.62	45.9	1.37	23398	1172	99.3	0.193	0.189	0.258

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]
2.6672			0.0515		-2.7187

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	18.742
f_angle_d	1.205
f_chiral_restr	0.079
f_bond_d	0.008
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4900
Nucleic Acid Atoms
Solvent Atoms	39
Heterogen Atoms	56

Software

Software
Software Name	Purpose
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.