5C7M

CRYSTAL STRUCTURE OF E3 LIGASE ITCH WITH A UB VARIANT

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	293	The ITCH and ubiquitin variant ubv.it.02 were mixed at molarity ratio 1:2, and then concentrated to 17mg/ml. The protein sample was mixed with 1mg/mL chymotrypsin at a 1:1000 (W/W) chymotrypsin:protein ratio right before set up crystallization. Crystal was initially obtained from SGC-I screen condition A05. Crystal used for structure refinement was grown in 1.6M NH4SO4, 0.2M NaAc, 0.1M HEPES pH 7.5, 5% Ethylene Glycol in hanging drop setup, using 1.2uL protein, 1.2uL well solution over 0.5 mL reservoir buffer at 20 C. Crystals grow to mountable size for ~1 weeks. Harvested crystal was flash-frozen in liquid nitrogen. A well solution containing 20% glycerol was used as the cryo-protectant

Crystal Properties
Matthews coefficient	Solvent content
2.72	54.79

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 121.115	α = 90
b = 121.115	β = 90
c = 85.547	γ = 120

Symmetry
Space Group	P 3 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	ADSC QUANTUM 315	ADSC Q315	2013-03-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-ID	0.97899	APS	19-ID

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	3.02	50	99.9	0.094	12.5	18.1		14296			104.49

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	3.02	3.07	100		0.908		18.5	699

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	MOLECULAR REPLACEMENT	THROUGHOUT	3TUG	3.03	49.43	14277	583	98.99	0.2554	0.2537	0.2969	RANDOM	103.68

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]
13.7063			13.7063		-27.4126

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	15.87
t_omega_torsion	2.31
t_angle_deg	0.83
t_bond_d	0.008
t_dihedral_angle_d
t_incorr_chiral_ct
t_pseud_angle
t_trig_c_planes
t_gen_planes
t_it
t_nbd
t_improper_torsion
t_chiral_improper_torsion
t_sum_occupancies
t_utility_distance
t_utility_angle
t_utility_torsion
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3868
Nucleic Acid Atoms
Solvent Atoms	3
Heterogen Atoms

Software

Software
Software Name	Purpose
BUSTER	refinement
HKL-2000	data collection
HKL-2000	data scaling
PDB_EXTRACT	data extraction
BALBES	phasing
MOLREP	phasing
HKL-3000	data reduction