ELECTRON MICROSCOPY

Sample

Arp2/3 complex

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument HOMEMADE PLUNGER
Cryogen Name ETHANE
Sample Vitrification Details 4 uL of sample was applied to freshly glow-discharged grid. Excess sample was manually blotted off with a dry Whatman No.1 filter paper for 5-7 seconds. Immediately after the blotting step the sample containing grid was rapidly vitrified by plunge freezing into liquid ethane.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 112170
Reported Resolution (Å) 4.2
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type FEI FALCON III (4k x 4k)
Electron Dose (electrons/Å2) 44.34
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TALOS ARCTICA
Minimum Defocus (nm) -700
Maximum Defocus (nm) -1300
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 120000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 200
Imaging Details Data were collected by combining untilted and tilted (20, 30 and 40 degrees) images. Stage shifting to the targeted exposure position was used for navigation during data acquisition.
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 2.12.4
IMAGE ACQUISITION EPU 2.2.0.65
CTF CORRECTION cryoSPARC 2.12.4
MODEL FITTING NAMD ?
MODEL FITTING Coot ?
MODEL FITTING UCSF Chimera ?
FINAL EULER ASSIGNMENT cryoSPARC 2.12.4
CLASSIFICATION cryoSPARC 2.12.4
RECONSTRUCTION cryoSPARC 2.12.4
MODEL REFINEMENT PHENIX ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION Local CTF estimation was performed for all micrographs using the CTF estimation package within cryoSPARC.