ELECTRON MICROSCOPY


Sample

Homodimer of two RalGAPa2-RalGAPb heterodimers

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details double blotting
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 420975
Reported Resolution (Å) 3.8
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 AB INITIO MODEL
Refinement Target cross correlation
Overall B Value 129.72
Fitting Procedure ?
Details A model of the RGalpha2/RGbeta complex was calculated using AlphaFold2 running on a local high performance computing cluster (PALMA II), docked into map from 3D reconstruction with ChimeraX and energy optimized with ISOLDE. In an iterative process, the model was optimized using real space refinement in Phenix Refine against the full density map, and manual model building with Coot using the full density map as well as the resampled multi body refinement maps.
Data Acquisition
Detector Type FEI FALCON IV (4k x 4k)
Electron Dose (electrons/Å2) 60
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model TFS KRIOS
Minimum Defocus (nm) 500
Maximum Defocus (nm) 4200
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 215000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION crYOLO 1.8.3
IMAGE ACQUISITION EPU 3.2.0.4776
CTF CORRECTION RELION 5
MODEL FITTING UCSF ChimeraX 1.7.dev2023
INITIAL EULER ASSIGNMENT RELION 5
FINAL EULER ASSIGNMENT RELION 5
CLASSIFICATION RELION 5
RECONSTRUCTION RELION 5
MODEL REFINEMENT PHENIX 1.21.1_5286
MODEL REFINEMENT Coot 0.9.8.95
MODEL REFINEMENT ISOLDE 1.7
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?