ELECTRON MICROSCOPY

Sample

self-assembled SSNA-1 filaments

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument LEICA EM GP
Cryogen Name ETHANE
Sample Vitrification Details After 1 min incubation at room temperature, the grid was manually blotted on the side of the grid with filter paper (Whatman Grade 1, Cytiva #1001-055) and blotted again with 4 uL of a solution containing lysis buffer supplemented with 0.1 %(v/v) n-octyl-beta-D-glucopyranoside (beta-OG, Anatrace #O311). The grid was then transferred to an EM GP2 plunger (Leica) with a chamber temperature of 15degC, maximal humidity, incubated for 1 min, blotted with Grade 595 filter paper (Ted Pella #47000-200) for 6 s and vitrified in liquid ethane.
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 80664
Reported Resolution (Å) 4.55
Resolution Method FSC 0.143 CUT-OFF
Other Details no helical parameters used
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol OTHER
Refinement Target ?
Overall B Value 265.8
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 BIOCONTINUUM (6k x 4k)
Electron Dose (electrons/Å2) 40.84
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 500
Maximum Defocus (nm) 2300
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 105000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 4.5.3
IMAGE ACQUISITION EPU ?
CTF CORRECTION cryoSPARC 4.5.3
MODEL FITTING Coot 0.9.6
MODEL REFINEMENT PHENIX 1.21_5207+SVN
INITIAL EULER ASSIGNMENT cryoSPARC 4.5.3
FINAL EULER ASSIGNMENT cryoSPARC 4.5.3
CLASSIFICATION cryoSPARC 4.5.3
RECONSTRUCTION cryoSPARC 4.5.3
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
NONE ?