3JAW

Atomic model of a microtubule seam based on a cryo-EM reconstruction of the EB3-bound microtubule (merged dataset containing tubulin bound to GTPgammaS, GMPCPP, and GDP)

ELECTRON MICROSCOPY

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Refinement

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.202
r_dihedral_angle_3_deg	16.948
r_dihedral_angle_4_deg	13.25
r_dihedral_angle_1_deg	8.85
r_mcangle_it	5.509
r_mcbond_it	3.032
r_mcbond_other	3.032
r_angle_refined_deg	1.379
r_angle_other_deg	0.947
r_chiral_restr	0.081
r_bond_refined_d	0.008
r_gen_planes_refined	0.005
r_bond_other_d	0.002
r_gen_planes_other	0.001

Sample
EB3-bound microtubule (merged dataset containing tubulin bound to GTPgammaS, GMPCPP and GDP)
Sample Components
alpha tubulin
Beta tubulin
EB3

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	FEI VITROBOT MARK II
Cryogen Name	ETHANE
Sample Vitrification Details	Blot once for 4 seconds before plunging into liquid ethane (FEI VITROBOT MARK II).

3D Reconstruction
Reconstruction Method	HELICAL
Number of Particles	79702
Reported Resolution (Å)	3.9
Resolution Method	FSC 0.143 CUT-OFF
Other Details	asymmetric (C1) reconstruction
Refinement Type
Symmetry Type	HELICAL
Axial Symmetry	C1
Axial Rise	9.44
Angular Rotation	27.71

Data Acquisition
Detector Type	GATAN K2 (4k x 4k)
Electron Dose (electrons/Å**2)	27.6

Imaging Experiment	1
Date of Experiment	2013-05-16
Temperature (Kelvin)	90
Microscope Model	FEI TITAN
Minimum Defocus (nm)	1000
Maximum Defocus (nm)	3500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	GATAN LIQUID NITROGEN
Nominal Magnification	27500
Calibrated Magnification	27500
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
RECONSTRUCTION	EMAN	1
RECONSTRUCTION	FREALIGN

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	CTFFIND4, each particle