7T7C | pdb_00007t7c

The hexagonal organization of Munc13-1 C1-C2B-MUN-C2C domains between lipid bilayers

ELECTRON MICROSCOPY

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

Specimen Preparation
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	12149
Reported Resolution (Å)	10
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C6

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/Å**2)	3.1

Imaging Experiment	1
Date of Experiment
Temperature (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

EM Software
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	CTF correction was performed during 3D reconstruction in RELION 3.1