ELECTRON MICROSCOPY

Sample

2D crystal of Munc13-1 C1-C2B-MUN-C2C domains between two lipid bilayers.

Specimen Preperation
Sample Aggregation State 2D ARRAY
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details blot for 5 sec before plunging, blot force -1
3D Reconstruction
Reconstruction Method SUBTOMOGRAM AVERAGING
Number of Particles 7
Reported Resolution (Å) 10
Resolution Method FSC 0.143 CUT-OFF
Other Details A composite 3D map of the crystal, generated by merging of hexagon-focused and six trimer-focused 3D maps (EMD-25737 and EMD-25738, respectively) in UCSF Chimera using the vop maximum command.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details Model for fitting was generated by AlphaFold using the construct's amino acid sequence. Flexible fitting into corresponding densities was performed using ISOLDE tool in ChimeraX. The resulting structures were copied and fitted as rigid bodies into the 3D map by the "fit in map" function in Chimera.
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 3.1
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 3500
Maximum Defocus (nm) 5000
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 ?
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION SerialEM ?
MODEL FITTING ISOLDE 1.2.0
MODEL FITTING UCSF ChimeraX 1.2
MODEL FITTING UCSF Chimera 1.16
FINAL EULER ASSIGNMENT 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 ?