2P22

Structure of the Yeast ESCRT-I Heterotetramer Core

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4	294	Crystals were grown by mixing 2 microL of 4 mg/mL protein in 50 mM Tris (pH 7.4), 150 mM NaCl, 5 mM DTT with an equal volume of 100 mM citric acid (pH 4.0), 800 mM ammonium sulfate., VAPOR DIFFUSION, HANGING DROP, temperature 294K

Crystal Properties
Matthews coefficient	Solvent content
2.91	57.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 68.054	α = 90
b = 83.766	β = 90
c = 269.146	γ = 90

Symmetry
Space Group	I 2 2 2

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	MARMOSAIC 300 mm CCD		2006-07-28	M	SINGLE WAVELENGTH
2	1	x-ray	100	CCD	MARMOSAIC 300 mm CCD		2006-07-28	M	MAD
3	1	x-ray	100	CCD	MARMOSAIC 225 mm CCD		2006-08-22	M	SINGLE WAVELENGTH
4	1	x-ray	100	CCD	MARMOSAIC 225 mm CCD		2006-08-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 22-ID	0.9795	APS	22-ID
2	SYNCHROTRON	APS BEAMLINE 22-ID	0.9795	APS	22-ID
3	SYNCHROTRON	APS BEAMLINE 22-BM	1.0332	APS	22-BM
4	SYNCHROTRON	APS BEAMLINE 22-BM	1.0688	APS	22-BM

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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
1,2,3,4	2.7	20	90.8	0.057	29.7	6.5		19506			66.8

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1,2,3,4	2.7	2.8	61.5		0.385	2.75	4.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	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	MAD+MIR	THROUGHOUT	2.7	20	19504	988	90.8	0.233	0.233	0.315	RANDOM	95.9

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]
43.12			-12.13		-30.99

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	18.8
c_scangle_it	12.51
c_scbond_it	9.49
c_mcangle_it	8.9
c_mcbond_it	5.77
c_angle_deg	1.2
c_improper_angle_d	0.76
c_bond_d	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4337
Nucleic Acid Atoms
Solvent Atoms	22
Heterogen Atoms	20

Software

Software
Software Name	Purpose
CNS	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
SOLVE	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.