5N5N

Cryo-EM structure of tsA201 cell alpha1B and betaI and betaIVb microtubules

ELECTRON MICROSCOPY

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Refinement

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	30.966
r_dihedral_angle_3_deg	11.097
r_dihedral_angle_4_deg	9.642
r_dihedral_angle_1_deg	4.942
r_long_range_B_refined	2.979
r_long_range_B_other	2.978
r_mcangle_it	1.349
r_mcangle_other	1.349
r_angle_refined_deg	1.135
r_angle_other_deg	0.867
r_scangle_other	0.717
r_mcbond_it	0.711
r_mcbond_other	0.711
r_scbond_it	0.327
r_scbond_other	0.327
r_chiral_restr	0.065
r_bond_refined_d	0.007
r_gen_planes_refined	0.004
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Sample
Human tsA201 cell tubulin microtubules

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	FEI VITROBOT MARK III
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	13000
Reported Resolution (Å)	4.2
Resolution Method	FSC 0.143 CUT-OFF
Other Details	Gold-standard high-resolution noise substitution test employed in resolution estimation (Chen et al., 2013)
Refinement Type
Symmetry Type	POINT

Map-Model Fitting and Refinement
Id	1
Refinement Space	REAL
Refinement Protocol	OTHER
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	DIRECT ELECTRON DE-20 (5k x 3k)
Electron Dose (electrons/Å**2)	25

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI POLARA 300
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	EMAN
IMAGE ACQUISITION	SerialEM
MODEL FITTING	UCSF Chimera
FINAL EULER ASSIGNMENT	FREALIGN
RECONSTRUCTION	FREALIGN
MODEL REFINEMENT	Coot
MODEL REFINEMENT	PHENIX
MODEL REFINEMENT	REFMAC

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION