ELECTRON MICROSCOPY
Sample
Ternary complex of alpha-beta tubulin with synthetic (R2x4) tau
Sample Components
Tubulin beta chain
Tubulin alpha-1B chain
Microtubule-associated protein tau
Specimen Preparation
Sample Aggregation StateFILAMENT
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE
Sample Vitrification Detailsblot force 10 pN, 6 second blot time. used C-flat 1.2/1.3 holey grids. First 2 uL of microtubules were adhered to grid for 30 seconds, followed by 2 4 ...blot force 10 pN, 6 second blot time. used C-flat 1.2/1.3 holey grids. First 2 uL of microtubules were adhered to grid for 30 seconds, followed by 2 4 uL washes of tau with 30 second incubation for each wash.
3D Reconstruction
Reconstruction MethodHELICAL
Number of Particles19505
Reported Resolution (Å)3.9
Resolution MethodFSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry TypeHELICAL
Axial SymmetryC1
Axial Rise8.7
Angular Rotation-25.75
Map-Model Fitting and Refinement
Id1
Refinement SpaceREAL
Refinement ProtocolFLEXIBLE FIT
Refinement Targetreal space correlation
Overall B Value120
Fitting Procedure
Details
Data Acquisition
Detector TypeGATAN K2 BASE (4k x 4k)
Electron Dose (electrons/Å**2)40.5
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelFEI TITAN KRIOS
Minimum Defocus (nm)500
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS2.7
Imaging ModeBRIGHT FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification37878
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging Details
EM Software
TaskSoftware PackageVersion
PARTICLE SELECTIONAppion
IMAGE ACQUISITIONSerialEM
CTF CORRECTIONCTFFIND4
MODEL FITTINGRosetta
INITIAL EULER ASSIGNMENTEMAN2
FINAL EULER ASSIGNMENTFREALIGN9.09
RECONSTRUCTIONFREALIGN9.09
MODEL REFINEMENTRosetta
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
PHASE FLIPPING ONLY24571