6TKO

ELECTRON MICROSCOPY

Sample

Formoterol-bound beta1-adrenoceptor coupled to beta-arrestin-1 stabilised by Fab30.

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Blotted for 2-3 seconds before plunging. Liquid ethane maintained at 92.15 K.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 403991
Reported Resolution (Å) 3.3
Resolution Method FSC 0.143 CUT-OFF
Other Details Half maps were locally filtered between refinement iterations using SIDESPLITTER, an adaptation of the LAFTER algorithm that maintains gold-standard separation between the two half maps.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol OTHER
Refinement Target Correlation coefficient
Overall B Value 80.6
Fitting Procedure ?
Details Initial placement was done manually in Coot, followed by rigid-body refinement in PHENIX and jelly-body refinement in REFMAC5. Manual remodeling was performed in Coot and iterated with real space refinement in PHENIX. Chemical restraints for formoterol were calculated in eLBOW using AM1 optimisation.
Data Acquisition
Detector Type GATAN K2 QUANTUM (4k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1200
Maximum Defocus (nm) 3000
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 105000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details Data collected with a stage-tilt of 30deg; two non-overlapping exposures per hole and multi-hole image-shift data acquisition strategies (3x3 holes per stage shift).
Imaging Experiment
Task Software Package Version
IMAGE ACQUISITION SerialEM 3.8.0 beta
CTF CORRECTION Warp 1.0.6
CTF CORRECTION RELION 3.1
MODEL FITTING Coot 0.8.9.2
IMAGE ACQUISITION EPU 2.3.0.79
INITIAL EULER ASSIGNMENT RELION 3.0.7
FINAL EULER ASSIGNMENT RELION 3.1
RECONSTRUCTION RELION 3.1
MODEL REFINEMENT PHENIX 1.17.1-3660
MODEL REFINEMENT REFMAC 5
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?