8OH4

Subtomogram averaging structure of cofilactin filament inside microtubule lumen of Drosophila S2 cell protrusion.

ELECTRON MICROSCOPY

---

Sample
Cofilactin filament inside the microtubule lumen of induced Drosophila S2 cell protrusion

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

3D Reconstruction
Reconstruction Method	SUBTOMOGRAM AVERAGING
Number of Particles	3801
Reported Resolution (Å)	16.5
Resolution Method	FSC 0.143 CUT-OFF
Other Details	helical symmetry (-162 twist, 29A rise) was applied during 3D classification but not during refinements.
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1
Refinement Space
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details	Drosophila cofilin and actin structures were predicted as a complex with Alphafold 2-Multimer. Actin from the predicted cofilin-actin complex was iteratively aligned with 8 actin subunits in the chicken cofilactin PDB model 5yU8. Two cofilin moieties at the pointed end were removed. Side chains were truncated. The model was not refined.

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	3

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	2500
Maximum Defocus (nm)	6000
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
IMAGE ACQUISITION	SerialEM	4.1.0beta
CLASSIFICATION	RELION	3.1
RECONSTRUCTION	RELION	3.1

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION	CTF estimation was performed in WARP. CTF correction was performed in Relion 3.1.